altair_8800b

( t If Incor.!~q to the input pins of ICs E and Mon the Interface board with the corresponding switcp up. Repair as necessary. Check logic operation from the input pins of ICs Yand Won the Display/Control board to the output pins of ICs E and H on the Interface hoard. Check any suspected ICs accord- ing to the instructions on page 4-5. present, If LOW pulses are absent, check the logic of ICs A1, Z, Wand V. Test the ICs according to the Instructions on page 4-5, H necessary. re present If HIGIt pulses are absent, check continuity with T pin 13, all olumJeter and repair as necessary. e present, If LOW signals are absent, check continuity frolll e present, pin 10 of IC A to pin 9 of IC A1 on the Display/ Control board. If the logic on IC A1 is incor- rect, check the IC according to the instructions on page 4-5. If a IIIGII MWRITE pulse is absent at bus pin 68, check for a lOW OEP pulse at pin 6 of Ie J. If absent, check pin 10 of Ie J on the Oisp1ay/

..\",. !!!s truction2.. I If the MURITE signal Is absent, \"l's\" will appear 0'1 in the data lights (fOI' each N A~-A7 s~/ltch lhat b up) for as long as the DEPOS IT sw Itch 3:00 1s he 1d, When the DEPOSIT switch is released, the data !lIOO 11ghts will return to their original pattern. The '< 0 DEPOSIT NEXT switch will act as EXAMINE NEXT, i.e. it will ~0 increment an address, but r:T fail to deposit It in memory. f. A HIGH 57 pulse should pro- If pr'escnt, pro duce lOl~s at IC F pins 1 and Stt~l) G. 15 and IC U pin 15 on the Interface board, and a IIlGH at pin 6 of IC C on the CPU board.

oceed to If Incorrect Control board when the switch is pressed. If ahsent, check continuity from pin 10 of IC J to pin 13 of IC A, pin 2 of IC Z, and pins 12 and 1 of IC P. Repair as necessary. Pins 2 and 14 of IC A should be IIIGII. If not, trace continuity to Vee. If the DEl' pulse is still absent, check IC J according to the instructions on page 4-5. If IC J is working properly, and if continuity is present. check ICs A and H on the Interface board for proper logic operation. If a HIGH DIGl pulse docs not occur at bus pin 57, trace logic from IC C pin 5 on the Display/Control board to a lOW pulse at pins 6 and 12 of IC D on the Interface board. Trace the IIIGII pulse from IC 8 pin 8 to a IIlGH at pin 6 of IC C on the CPU board. Pin 2 of IC D should pulse IIlGH simul- taneous ly with IC C pi n 6. If not. check the logic from pin 2 of IC 0 to pin 17 of IC M on the CPU board. Check the ICs. 1f necessary, according to the instructions on page 4-5. If absent, check for a CS signal at pin 4 of IC J and for IIIGH pulses from IC P pin 12 to pin 5 of IC J on the Display/Control board. If the signals are absent. trace continuity and repair as neces- sary. Trace logic to IC D pin 12 on the Inter- face board. Pins 4, 5, 9, 10, 13 and 2 of IC 8

Ins tructi.91!1- ~ I ()) W

!L Incorr~c.1 should be IIIGIL If pins 4, 5, 9 or 10 are lOl~, tritce continuity to VRl pIn 2 on the Interface board. If pin 2 of Ie 8 is lOl', trace logIc and continuHy to pin 17 of IC M. Ie Mpin 17 should be IIIGII. If not, look for shorts and check IC V according to the Instructions on page 4-5. If pin 13 of IC 8 Is lOW, check IC J on the Illterface board according to the Instructions 011 Ilage 4-5. Pins 12 and 13 of Ie J should be lOW. If not, check ICs C and 0 on the Interface board accordIng to the Instructions on page 4-5. 57 should produce a lOW pulse at pin 12 of IC 8, causing a ilIGII pulse at pin 1 (of IC 8). If a IIIGII pulse Is not present at pin 1, check IC 8. according to the Instructions on page 4-5. Trace the 111611 pulse fl'OIll IC B pin 1 to IC C pin 5 on the CPU board. (PIn 4 of IC C should be IIIGII.) Absence of a lOW pulse at pin 6 of Ie B will cause all \"l's\" to be deposited Into memory (no Platter how the A'/J-A7 switches are set) when the DErOSIT switch Is pressed. Pressing the EXAMINE switch will cause IIIGlls only at A3, A4 and A5 (no rna Her how the A'/J-A15 switches are se t) , since the CPU receives an RST 7 (377) Instruction and jun~s to location 070.

Ins t !J:l.f.tl.!!!!- -I f-C G. A IUOII S8 pulse should pro- If present, pr duce a IUGII REAOY pulse on pin 23 of Ie lion the CPU Step 12. board. 12 Check the DEPOSIT switch for . Proceed to Ste proper operation, it should deposit each bit separately. 3: 00 IIICXl '<0 ~0 C\" ..l...O.......

-C-or-rec-t .!.f...J~correct roceed to If the READY pulse is absent at pin 23, check for a mGII pulse (from IC P) at pin 1 of IC J on the p 13. Display/Control board and for a CS signal at pin 2 (of IC J). If the pulse is absent at pin 1, check continuity to pins 1 and 12 of IC P. Repair as necessary. If the CS signal is absent at pin 2, refer to Step 13 on page 4-23. Trace logic from rin 12 of IC J to a HIGH pulse on pin 11 of IC Ml. Check any suspected ICs according to the instructions on page 4-5. Pins 12 and 10 of IC m should be IJIGII. If not, trace continuity to Vee. Pin 13 of IC H should be mGII. If a con- stant lOW Is present, check logic at ICs Jl and T1 and replace, If necessary. Trace logic from IC Ml pin 8 to IC M 011 the CPU. board. Replace ICs and repa I r shorts or 0llens If necessary. If ICs M or f appear defective, refer to Section 4-3, Step 6 on Ilage 4-20. If the switch cannot deposit the bits separately, try different bit combinations. A bit that cannot be deposited separately may be dependent on another bit, check for shorts with an ohliineter set at X1K or higher. A lOW resistance reading between two data lines Indicates a short. Repair as necessary.

( Instructions if Cor 14 Lower address switches A8-A15 in 15 order to isolate any effect they If there is no may hilve 011 the c1rcuHry. The the symptums, p switch symptoms should not Step 14. change. ICs 81 and T on lhe Display/ If the symptoms Control board are not needed change, lIIi1ke su for the EXAMINE, EXAllINE NEXT, off a/lll \"cinsta DEPOSIT and DEPOSIT NEXT and 1. Proceed functions. If problems occur with these functions, turn Proceed to Step powe,. off and relllove ICs 81 and T from the board. Removal of 81 and T will isolate any effects these ICs uwy cause. lIowever. the switch symptoms should not change. Examine the IC outputs in order to test the Display/ Control board's open collec- tors (ICs Y, Wand U), the address switches and conti- nuity to pull-up resistors R41-R48 by lifting up each address switch (A~-A15) separately. +::0 I ()) 01

( rT~! .!L.!!,correcl If the symptoms change when A8-A15 are lowered, change in check the logic operation of ICs W, U, Z, Al and A. If l,ecessary, check the les according to the proceed to instructions on page 4-5. s do not If the symptoms change, check 111 ns 1 and 2 of ure pOl\"ler 15 both ICs for lOWs. If absent, trace continuity all lCs 81 to the Ground pin of the 7805 voltage regulator d to Step 15. on the Dtsplay/Contro1 board. Pin 13 of both ICs should be lOW. If not, trace conttnuity to ptn 11 (for IC 81) or 15 (for IC T) of IC A. Repair as necessary. Pin 13 of both ICs should never pulse IIIGII for the EXAMINE/EXAMINE NEXT or DEPOSIT/OEPOSIT NEXT functions. Pin 14 of both ICs should be IIIGII. If not, trace continuity to Vee (VR1 pin 2). p 16. If any of the outputs fa 11 to go IIIGIl when the correspond1 ng address switch ts lifted, check for a lOW tnput signal. If the input ts not LOW, check for shorts and continuity to pin 21 of IC A. A lOW Input stgnal lndtcates that a bad IC exists or that one of the components is holding the line LOW. Check Vee and Ground to the IC. Pin 13 of both ICs 81 and T should be LOll. If not, trace continuity back to IC A and check Ie

!!!.~!!uC t I ul]~ A bad open collector can cause the switch da ta to be eXiI\\IIl ned or deposited improperly. If an address switch 1s dO~IO, the correspondlng open collector output ls disconnected from Vcc and will floilt as a lOW. lifting the addl~ss switch should raise the output of the open collector to approx- lmately 4v. (flote: The cO/IIDon Inputs of ICs Y, Il and U should be lOW when the com- puter is stopped and no switches are pressed.) 16 A. If the ACCll-lUlATOR DISPLAY swltch will not function, follow the steps below: 1) Check. the I)round s trap Proceed to Ste from VRl on the Display/ Control board to the computerj It must be connected in order for the ACCU·IUlATOR DISPLAY swi tch to function pr'o- perly.

.!L!!!~t A according to the instructions on page 4-5. Pins 1 and 15 of IC Rand pln 1 of IC S (on the Dis- play/Control board) should be IlIGII. If not, trace logic to pin 10 of IC A. Test any suspected ICs according to the instructions on page 4-5. Check for shorts on both the Display/Control board and the Interfilce board along the FOlD-FOIl lines. ep 2). Repair as necessary. (

:.:: a> .Ins tructJ.Q!!~ lIJor 2) Mdke sure jUlllper JrJ to Proceed to Step '_P<Ia0C>I JC is present on the CT Interfac~ board . ..t....o...... 3) Check for LOI.,s at II Ins Proceed to Stell 2 and 1 of ICs 81 and T on the Display/Con- tra1 board. (A cons tant IIIG/l should be present at pin 14 of both ICs.) 4) A,. 10llg as the ACCUHIJ- Proceed to Step LAlOR DISPLAY switch is held. pin 2 of IC G on the Interface bnard should be LOW. PillS 13 alld 14 of IC G should be HIG/I and pill 1 should be lOW. S) Pres sing the ACCU~lUI.ATOR Proceed to Step DISPLAY switch should produce LOW pulses at pins 8 and 9 of IC D on the Interface board. As a result, pin 10 of IC D should pulse III Gil. PillS 10 and 11 of IC K sho!Jld also pulse IIIG/I.

rect !L!!!f2frec t 3). Repair if necessary. 4). If pins 2 and 1 are IIIG/I. trace continuity to 5). Ground (p1n 3 of VR1) on the Display/Control board. If p1n 14 is LOW. trace continuIty to O. VR1, pIll 2. Repair as necessary. If pIn 2 Is IIIGI., trace logic frorn IC G to IC Yl on the Display/Control board. Check any suspected ICs according to the instructions on page 4-5. If pins 13 and 14 of IC G are lOW, trace con- tlnu1ty to VRl pin 2 (on the Interface board) and repair as necessary. Since pulses are usually too rapid to detect visually, run the following program to generate several pulses. location 8it Pattern 000 333 001 377 002 303 003 000 004 000

Instructions If jumper JE to JF is present on the Inter- face board, a 111611 pulse should be present at pin 9 of IC K. The resulting lOW at pin B (of IC K) should pro- duce a HIGII pulse at pin 11 of IC G. B. If the ACCUMULATOR DEPOSIT switch will not function, check the Inputs of ICs 81 and T as described In Step 14 on page 4-65. C. If the IN switch wtl 1 not function, check the SENSE switch operation as shown In Table 4-9, starting on page 4-50. D. If the OUT swHch wi 11 not functton, check the sense switch operation as shm\"lO In Table 4-9, starting all page 4-50. :;:: en \"' \"<C0YJ w0 r:r to ~ ~

lLlncorrect (Note: Jumper JE to JF 011 the Display/Control board must be absent for the following check.) To check the levels of ICs D, J and G pin 4, 5 top the cOlllputer and examl ne to 1oca t1 on 000. l1 ft the Sf NGLE STEP sw Itch twl ce with the above prograul deposited into memory. If pln 10 of IC K is LOW, trace the SOUT logic to the CPU board. If pin 11 of IC K is lOW, trace the PWR signal to IC Mon the CPU board. Check any suspected ICs according to the Instructions on page 4-5.

ill~1Jill~W rnrn(ID(ID~ w'- ~rn®uu(ID[fJ_ will~~rnu~rn~ 5-1/(5-2 _blank)

SECTION V ASSEMBLY 5-1. GENERAL NOTE Section V contains instructions for Some important warnings are the circuit and mechanical construc- also included in the hints tion of the Altair 8800b computer. booklet. Read them care- Included in this section are assem- fully before you begin work bly hints, detailed component in- on your unit -- failure to stallation instructions, and printed heed these warnings could circuit board and main frame assem- cause you to void your war- bly instructions. ranty. 5-2. ASSEMBLY HINTS Before beginning the construction Check the contents of your kit of your unit, it is important that against Appendix 8 (Parts List) in you read the \"MITS Kits Assembly this manual to make sure you have Hints\" booklet included with your all the required components, hard- kit. Pay particular attention to ware, and parts. The components the section on soldering, because are in plastic envelopes; do not most problems occur as the result open them until you need the com- of poor soldering. It is essential ponents for an assembly step. You ~ that you use the correct type of will need the tools called for in soldering iron. A 25-30 watt iron the liMITS Kits Assembly Hints\" with a chisel tip (such as an Ungar booklet. 776 with a 7155 tip) is recommended in the assembly hints booklet. April, 1977 5-3 8800b

As you construct your kit, follow the instructions in the order they are presented in the assembly man- ual. Always complete each section before going on to the next. Two organizational aids are provided throughout the manual to assist you: 1) Boxed off parts identifi- cation lists, with spaces provided to check off the components as they are installed; 2) reproductions of the si1kscreens showing previously installed components, components being installed, and components yet to be installed (Figure 5-1). previously install ed components 5-1. Typical Silkscreen 5-4 Aori 1 t 1977 88CCb

PR.INTED CIRCUIT BOARD VISUAL INSPECTION 5-3. CO~lPONENT INSTALLATIOI~ INSTRUCTIONS It is recommended that a visual inspec- tion of the PC Board(s) in your kit be Pages 5-6 through 5-12 describe the made before beginning the assembly pro- proper procedures for installing cedures. various types of components in your kit. Look for etchi n9 IIbri dges II or etching lIopensll in the printed circuit lands, Read these instructions over very as shown in the drawings below: carefully and refer back to them wnenever necessary. Failure to ~~~~~~~ ~~r~~ge\" ---'1; ~.:1!.•t properly install components may l cause permanent damage to the com- l t~: ponent or the rest of the unit; it b··········.··.;~ . '. '. ~~\" .'.... I:~~ will definitely void your warranty. ;..;..:.-:1 More specific instructions, or procedures of a less general nature, <\"<:::~ ;:..=.:=:. ~••••::...:•::.:•.:.: will be included within the assem- ==..'.::==.'.:.:.Z.:':. . bly text itself. TIIhhisaircloinueldll also appear as a Under no circumstances should you cut. proceed with an assembly step with- out fully understanding the proce- dures involved. A little patience at this stage will save a great deal of time and potential IIhead- aches ll later. A thorough visual inspection will elim· inate one possibility for errors, should the board not operate properly after it is assembled. Troubleshooting efforts ~ay then oe concentrated elsewhere. !~pri 1, 1977 5-5 3800b

5-4. Resistor Installation Instructions Resistors have four (or P9ssibly five) color-coded bands as represented in the chart below. The fourth band is gold or silver and indicates the tolerance. NOTE: In assembling a HITS kit, you need only be concerned with the three bands of color to the one side of the gold or silver (tolerance) b~ld. These three bands denote the resistor's value in ohms. The first two bands correspond to the first two digits of the resistor's value and the third band represents a multiplier. For exarople: a resistor with red, 2ND BAND 4TH BAND violet, yellow and silver bands has a VIOLET \"\\ SILVER value of 270,000 ohms and a tolerance of 10%. By looking at the chart below, IST BAND,\"\", \\ you see t~at red is 2 and violet 7. By ~ultiplying 27 by the yellow multiplier RED band (10,000), you find you have a 270,000 ohm (270K) resistor. The sil- 3RD BAND ver band denotes the 10% tolerance. YELLOW ese this process to choose the correct resistor called for in the manual. RESISTOR CCLOR CODES Use the following procedure to install the resistors onto the boards. Make BArlDS 3rd BAJ.~D sure the colored bands on eacn resistor match the colors called for in the list COLOF. 1&2 (Multiplier) of Resistor Values and Color Codes given in the asse~bly instructions. . Black o Brown 1. Using needle-nose pliers, bend the Red 1 leads of the resistor at right an- i, Orange 2 gles to match their respective holes 3 on the PC board. : Yellow 4 2. Install the resistor into the cor- : Green 5 rect holes on the silk-screened side iBlue 6 of the PC board. i,,Violet 7 8 3. Holding the resistor in place with l Gray 9 one hand, turn ~~e board over and bend the two leads slightly outward. \\'rhi te 4. Solder the leads to ~~e foil patte 5-6 on the back side of the board; then~ clip off any excess lead lengths. Apr; 1. 1977 880Gb

5-5. Capacitor Installation Instructions B. Epoxy Dipped Tantalum, Epoxy A. Electrolytic Capacitors Dipped Ceramic, and Ceramic Disk Polarity must be noted on electroly- Capacitors tic capacitors before they are in- stall ed. Polarity must be noted on epoxy The electrolytic capacitors con- dipped tantalum capacitors before tained in your kit may have one or they are installed. possibly two of three types of pol- There are two types of epoxy dipped arity markings. To determine the tantalum capacitors contained in you correct orientation, look for the your kit. The first type is blue on following. the positive side. The second type is marked with \"+\" signs on the positive side. Both types of epoxy dipped tantalum capacitors are shown in the drawings below. ~ Positive ~ Side .r----f--f---;a ELECTROLYTIC Epoxy Dipped CAPACITOR Tantalum Capacitors One type will have plus (+) signs The epoxy dipped ceramic capacitors on the positive end; another will and the ceramic disk capacitors are have a band or a groove around the non-polarized. positive side in addition to the These two types of capacitors are plus signs. The third type will shown in the drawings below. have an arrow on it; in the tip of the arrow there will be a neg- Epoxy Dipped Ceramic Disk ative (-) sign. The capacitor must Ceramic Capacitor Capacitor be oriented so the arrow points to the negative side. Install these 4 types of capacitors· Install the electrolytic capacitors using the following procedure. ,Make using the following procedure. Make sure you have the correct capacltor sure you have the correct capacitor value before installing each one. value before installing each one. 1. Bend the two capacitor leads to 1. Bend the two leads of the cap- conform to their respective holes acitor at right angles to con- on the board. form to their respective holes on the board. Insert the cap- 2. Insert the capacitor into the cor- acitor into the holes on the rect holes from the silk-screened silk-screened side of the side of the board. Holding the board, aligning the positive capacitor in place, turn the board side with the \"+\" signs printed over and bend the two leads slight- on the board. ly outward. 2. Holding the capacitor in place, turn the board over and bend the 3. Solder the two leads to the foil two leads slightly outward. Sol- (bottom) side of the board and, der the leads to the foil (bot- clip off any excess lead lengths. tom) side of the board and, clip off any excess lead lengths. 5-7 AOl\"il, 19i7 8800b

5-6. Diode Installation Instructions 5-7. Transistor Installation Instructions NOTE: Diodes are marked with a band on To install transistors, use the fol- one end indicating the cathode end. lowing instructions. Each diode must be installed so that the end with the band is oriented towards NOTE: Always check the part number of the band printed on the PC board. Fail- each transistor before you install it. ure to orient the diodes correctly ~ay (See listing of Transistor Part Numbers result in permanent damage to your unit. for each board.) Some transistors look identical but differ in electrical char- DIODE acteristics, according to part number. If you have received substitute part numbers for the transistors in your kit, check the Transistor Identification Chart which follows these instructions to be sure you make the correct sub- stitutions. Use the following procedure to install NOTE: Always make sure the transistor diodes onto the board. Refer to the list is oriented so that the emitter lead is of Diode Part N~Ders included for each installed in the hole on the PC board board to make sure you install the correct labeled with an \"E\". To determine diode each time. which lead is the emitter lead, refer to the Transistor Identification Chart. 1. Bend the leads of the diode at right angles to match their respective ...., After the correct transistor has holes on the board. been selected and the leads have 2. Insert the diode into the correct been properly oriented, insert the holes on the silk screen, making transistor into the holes on ~~e sure the cathode end is properly silk-screened side of the board. oriented. Turn the board over and bend the leads slightly outward. 2. Holding the transistor in placp-, turn the board over and bend the 3. Solder the two leads to the foil three leads slightly outward. pattern on the back side.of the board; then clip off any excess 3. Solder the leads to the foil pattern lead lengths. on the back side of ~~e board; then clip off w'Y excess lead lenghts. 5-8 April, :97i ~80C1>

TRANSISTOR IDENTIFICATION CHART ~• 8\"~ D~ 1 • ~k. \" C• I :.1'-1 1114&.1. 6I I ~Ji .,- aill ,, 'I.4T i 'I.4T 9 'I.4T ~~I .. '1,,1Ir ;? ~A ~ Ii i ~ e.0 k@~.\"... kib C I ~~C. .~: •Ict.~ I~~. • .~• ~• • • , @ CI 6?D& ~ ,-, • @C I D• CI TISII DI5T2 ST2907 TIS 92 2N602I ST98 EN 2907* _-IO!I S58475 2NS2IO CS4458 _-III 2N44l0 CS4459 EN4410 ' PN2907 CS4457 2N2907 EN2907* CS4410 ..... 2H425O 2H5842 2M3145 (NO F1.ATl IN THE ILLUSTRATION ABOVE THE OUTLINE OF EACH TYPE OF TRANSISTOR IS SHOWN ABOVE THE PADS ON THE CIRCUIT BOARD WITH THE CORRECT DESIGNA- TION FOR EACH OF THE THREE LEADS. USE THIS INFORMATION TOGETHER WITH THE INFORMATION IN THE ASSEMBLY MANUAL FOR THE CORRECT ORIENTATION OF THE TRANSISTORS AS YOU INSTALL THEM. THE FOLLOWING IS A LIST OF POSSIBLE SUBSTITUTIONS: IF ANY OTHERS ARE USED YOU WILL RISK DAMAGING YOUR UNIT: 2N44l0 = EN4410 = CS4410 = CS4437, CS4438, TIS98, ST98, S38473 (NPN) EN2907 = 2N2907 = PN2907 = ST2907, CS4439 (PNP) WHEN MAKING SUBSTITUTIONS, REFER TO THE ILLUSTRATION TO DETERMINE THE CORRECT ORIENTATION FOR THE THREE LEADS. *Configuration of the leads on EN2907 may vary. Apr; 1. 1977 5-9 880Cb

5-8. Ie Installation Instructions All ICs must be oriented so that the notched end is toward the end with the arrowhead printed on the PC board. Pin 1 of the IC should correspond with the pad marked with the arrowhead. If the IC does not have a notch on one end, refer to the IC Identification Chart to identify Pin 1. To prepare ICs for installation: All ICs are damaged easily and &hould be handled carefully -- especially static-sensitive MOS ICs. Always try to hold the Ie by the ends, touching the pins as little as possible. When you remove the IC from its holder, CAP£FULLY straighten any bent pins using needle-nose pliers. All pins should be evenly spaced and should be aligned in a straight line, perpen- dicular to the body of the IC itself. A. Installing ICs without sockets: B. Installing rcs with sockets: 1. Ori~nt the IC so that Pin 1 coincides 1. Referring to the drawing below, set with the arrowhead on the PC board. the IC socket into the designated holes on the board and secure it 2. Align the pins on one side of the IC with a piece of masking tape. so that just the tips are inserted into the proper holes on the board. 3. Lower the other side of the IC into PC place. If the pins don't go into their holes right away, rock the IC BOARD back, exerting a little inward pressure, and try again. Be patient. 2. Turn the board over and solder each The tip of a small screwdriver may pin to the foil pattern on the back be used to help guide the pins into side of the board. Be sure to solder place. When the tips of all the pins each pin and be careful not to leave have been started into their holes, any solder bridges. Remove the mask- push the IC into the board the rest ing tape. of the way. Tape the rc to the board with a piece of masking tape. 3. Orient the IC over the socket so that Pin 1 coincides with the arrowhead 4. -Turn the board over and solder each on the PC board. pin to the foil pattern on the back side of the board. Be sure to sol- 4. Align the pins on one side of the der each pin and be careful not to socket so that just the tips are leave any solder bridges. Remove inserted into the holes. - the masking tape. 5. Lower the other side of the IC into WAR.11I:J'G: place. If the pins don't go into Make sure none of the pins have been pushed underneath the IC during their holes right away, rock the IC insertion. back, exerting a little inward pres- 5-10 sure, and try again. Be patient. When the tips of all the pins have ~een started into their holes, push the IC into the socket the rest of the ·flay. April J 197i 8800b

MOS IC SPECIAL HANDLING PRECAUTIONS There are several MOS integrated circuits contained in this kit. These IC's are very sensitive to static electricity and transient voltages. In order to prevent damaging these components, read over the following precautions and adhere to them as closely as possible. FAILURE TO DO SO MAY RESULT IN PERMANENT DAMAGE TO THE IC. 1) All equipment (soldering iron, tools, 5) Always touch the PC board before solder, etc.) should be at the same touching the IC to the board. Try potential as the PC board, the assem- to maintain this contact as much as bler, the work surface and the IC it- possible while installing the IC. self along with its container. This can be accomplished by continuous 6) Handle the IC by the edges. Avoid physical contact with the work sur- touching the pins themselves as much face, the components, and everything as possible. else involved in the operation. 7) Dry air moving over plastic .can res~lt 2) When hand11ng the Ie, develop the in the development of a significant habit of first touching the conduc- static charge. Avoid placing the IC tive container in which it is stor- near any such area or object. ed before touching the IC itself. 8) In general, never touch anything to 3) If the Ie has to be moved from one the IC that you have not touched first while touching both it and the container to another, touch both IC itself. containers before doing so. 4) Do not wear clothing which will build up static charges. Preferably wear clothing made of cotton rather than wool or synthetic fibers. April. 1977 5-11 8800b

PIN 1 uPIN 1 PIN' W PIN 1 o 0PINf ~ PIN1 0 o INTEGRATED CIRCUITS (ICs) C~~ COME WITH ANY ONE OF, OR A COMBINATION OF, SEVERAL DIFFERENT MARKINGS. THESE ~~RKINGS ARE VERY IMPORTANT IN DETERMINING THE CORRECT ORIENTATION FOR THE ICs WHEN THEY ARE PLACED ON THE PRINTED CIRCUIT BOARDS. REFER TO THE ABOVE DRAWING TO LOCATE PIN 1 OF THE ICs, THEN USE THIS INFO~~TION IN CONJUNCTION WITH THE INFOR.\\1ATION BELOW TO PROPERLY ORIENT EACH IC FOR INSTALLATION. WARNING: INCORRECTLY ORIENTED IC I s MAY CAUSE PERMA..~T DAMAGE! THE DRAWING ON THE LEFT INDICATES VARIOUS ~lETHODS USED TO SHOW THE POSITION OF ICs ON THE PRINTED CIRCUIT BOARDS. THESE ARE SILK-SCREENED DIRECTLY ON THE BOARD. THE ARROWHEAD INDICATES THE POSITION FOR PIN 1 WHEN THE IC IS INSTALLED. 5-12 April. 19i7 8800b

5-9. INTERFACE CARD ASS5~BLY IC Part Numbers 5-10. IC INSTALLATION (Figure 5-2) ( ) C,E,M,P,R,T 74LS04 or 74LS14 Install the following 22 integrated U,V,W,X,Y circuits (Bag 1) on the Interface Card according to the IC Installation ( ) A,B,L 74LS20 or 74LS13 Instructions, Section A, given on page 5-10. IC G will be installed ( ) F,H,N,S 74367 or 8097 or with a 24-oin socket accordinq to the ( )J 8T97 Ie Installation Instructions,-Section B, nage 5-10. , The chart below lists the 22 ICs, their corresponding part numbers, 7400 or 74LSOO and acceptable part substitutions. ( )0 7402 or 74LS02 ()K I 7410 or 74LS10 I ( ) G (wi th socket) I 8212 r- , II '--- I I I~tIIi J~I~JO ~EimJ 0--Pi ~~IO ~BJN<::> ~I RS - T.U <:::> vc> w<=:::>.x • ;'..' v. :-. -:-: . ;.-: . s-? Interface IC InstJl1ation .J.pri 1, 1977 8800b

5-11. RESISTOR INSTALLATION (Figure Resistor Values i:lI ( ) Rl through R7 2.2K ohm (red, red, red) 1/2t~ Install the 7 resistors, Rl throuah or 1/4H R7 (Bag 5 ), on the Interface Card-- according to the Resistor Installation Instructions given on page 5-6. NOTE -Save the excess resistor I leads for use in Paragraph 5-15. I·~ I ! ., 'l~ ·1 $·1 ·'1 ·1 .._ ~R5 ~.fl·I:1 ·1 ·1 ·1 5-3. Interface Resistor Installation 5-14 April. 1977 8800b

. 5-12. SUPPRESSOR CAPACITOR INSTALL- 5-13. CAPACITOR INSTALLATION ATION (Figure 5-4) (Figure 5-4) There are 22 suppressor capacitors Install the two electrolytic capa- (Bag 2) to be installed on the Inter- citors, C1 and C3 (Bag 2), and the face Card. These capacitors are two ceramic disk capacitors, C2 and used for noise suppression. They C4 (Bag 2), according to the instruc- are located next to the ICs on the tions given on page 5-7. si1kscreen, but they have no indivi- The chart below lists the 4 capaci- dual component designations. In- tors and their values. stall the suppressor capacitors according to the Ceramic Disk Cap- Capacitor Values acitor Installation Instructions ( ) Cl, C3* 20uf - 35uf, 12V - 20V, given on page 5-7. electrolytic Suppressor Capacitor Values ( ) 22 suppressor O. 1uf, l2V or ( ) C2, C4 O. 1uf, 12V or O. 1uf, capacitors O.luf, 16V 16V, ceramic disk NOTE *Cl and C3 may have any value within the range shown. Save the clipped off capa- citor leads for use as jumper wires in Paragraph •..I··..5-14. ~I,~...I...:e:. ~ I.·.·.···· .i ... · u··;.· v \" I.... ~ ~ ~ . 5-4. Interfac~ Suppressor Capacitor and Capacitor Installa:ion Aori1.19ii 5-15 3aOOb

5-14. JUMPER CONNECTIONS (Figure 5-15. FERRITE BEAD INSTALLATION (Figure 5-6) Err Install the three ferrite beads, Ll There are two jumper wires to be through L3 (Bag 3), according to the installed on the Interface Card. following instructions. . Use the capacitor leads saved from 1. Usjng the resistor leads saved the Suppressor Capacitor Installa- tion~ Cut two leads, to .l-inch from Paragraph 5-11, cut three lengths, and jumper the following l-inch lead lengths. pads on the Interface Card. 2. Insert a lead through the bead, and bend the ends so they con- Jumper Connections form to their designated holes on the Interface Card. ( ) JC to JD 3. Insert the leads into the card, and solder to the foil (bottom) ( ) JE to JF side of the card. Be sure not NOTE to leave any solder bridges and . clip off any excess lead lengths. Do not jumper JA to JB here. u 'Ii. \" J JB JD ..S v --- \", II> LI ~ ~L2 _ _I 5-5. Interface Jumper Connections 5-6. Interface Ferrite Bead Installation 5-16 Aor; 1. 197i 8S00b .

INSERT PAGE Altair 8800b Interface Card Assembly Procedure Addendum to page 5-16, Jumper Connections If the Die Interface Board jumpers are insta11ej according to the instructions given on page 5-16, the front panel data lights will display outputs to channel 37o7u~pu(t2s55t,o0)a. ll If jumper JE-JF is removed, the data lights will display channels. For a more detailed discussion of these jumper options, refer to the Theory of Operation Manual, page 3-60, and Figure 3-15 (sheet 3). 5-16A

5-16. VOLTAGE REGULATOR INSTALLATION 3. Referring to Figure 5-7, set the regulator and heat sink in place (Figure 5-7) on the silk-screened side of the '- Install the voltage regulator, VR1 card. Secure them in place with a #6-32 x 3/8 inch screw, a #6 (Bag 1), and heat sink on the In- lockwasher, and a #6-32 nut. terface Card according to the follow- ing instructions. 4.. Solder the three leads to the 1. Set the regulator in place on foil (bottom) side of the card. Be sure not to leave any solder the silk-screened side of the bridges. Interface Card, aligning the leads with their designated holes. 5. Clip off any excess lead lengths. 2. Use needle-nose pliers to bend Voltage Regulator Part Number each of the three leads at a right angle to conform to its ( ) VRl 7805 proper hole on the card. NOTE <;>_.--- '#6-32 x 3/8\" Use heat sink grease when in- I Screw stalling this component. Apply the grease to all metal I surfaces which come in contact I with each other. I ~---MC7805 .. HEAT _ _ • SINK III V\", LI.. I 3 2 IL2 , . Lock ..Washer---~_ # 6 - 3 2 - - - 0 4. . 5-7. Interface Voltage Regulator Installation April,197i 5-17 8800b

5-17. MALE CONNECTOR INSTALLATION 3. Solder each pin to the foil (bottom) side of the card. Be (Figure 5-8) sure not to leave any solder bridges. Install one lO-pin Male Connector, P3 (Bag 3), on the Interface Card 4. Clip off any excess lead lengths. according to the following instruc- tions. 5. The arrow on\" the si1kscreen points to Pin #1. After in- 1. Orient the connector as shown in stalling the male connector, Figure 5-8, with the bent pins clip off pin #2 of the con- pointing towards the top of the nector. This is done for card. keying purposes. Further keying instructions are 2. Insert the short pins into the given in Paragraph 5-76 . 10 designated holes on the si1k- screened side of the card. . . . . . . RS lO-Pin Male Connector 5-8. Interface Male Connector Insta1laticn 5-18 Aori 1. 1977 8800b

5-18. RIBBON CABLE PLUG INSTALLA- 2. Insert the pins into their pro- TION (FIGURE 5-9) per holes and solder each pin to the foil (bottom) side of the ~Install the two ribbon cable plugs, card. Be sure not to leave any Pl and P2 (Bag 4 ), on the Interface solder bridges. Card according to the following in- structions. NOTE 1. Orient the Ribbon Cable Plug as The socket end of the Ribbon Cable Plug will be connected shown in Figure 5-9, so that later in Paragraph 5-75. the socket end of the plug hangs over the left side of the card. PI Ribbon Cable L .:'pl\"11 , 197i 5-9. I~tcrfac~ RiJbo~ CaJlc Plu,: I~s~al1a~io~ 5-19/(5-20 blank) 8800b

5-19. DISPLAY/CONTROL BOARD ASSEMBLY Silkscreen IC Part Socket 1-20. IC SOCKET AND IC INSTALLATION Designation Number Size (Figure 5-10) ( ) A, T, 81 8212 24-pin There are 4 ICs, A, G, T, Bl (8aglO), to be installed with sockets on the ( )G 1702A* 24-pin Display/Control Board. Install these sockets and ICs according to *IC G is a programmed PROM IC the Integrated Circuit Installation labelled \"B D/C\". Instructions, Section 8, given on page 5-10. 5-10. Display/Control IC Socket and Ie Installation April, 1977 5-21 8800b

5-21. IC INSTALLATION (Fiaure 5-11) IC Part Numbers Install the following 42 integrated circuits (Bag 1) on the Display/ ( ) S,D,E,F,H,K,M 7407 Control Board according to the In- tegrated Circuit Installation In- ( ) U,W, Y, Vl ,Zl 7405 or 74LS05 structions, Section A, given on page 5-10. ( ) Cl, Nl ,Fl , U1 , 74LS175 Gl ,Wl ,Hl , Yl ( ) Ll,Ml 74LS74 ( ) K1 74367 or 8097 or 8T97 ( ) R,S 8T98 ( )P 7493 7400 or 74LSOO ( ) Pl,Z ( ) C,J1,E1 ,Rl 74LS04 ( ) A1 74LS14 74L10 ( )J 7410 or 74LS10 ( ) V,Ol,T1 74LS30 or 74L30 ( ) Xl,N ( ) L,X 4040 4009, 4049 ( ) 51 or 4449 5-22 April t 1977 8800b

5-22. RESISTOR INSTALLATION NOTE (Figure 5-12, page 5-24) Save any excess resistor leads for jumper connections There are 76 resistors (Bags 2, 3 in Paragraph 5-24 and for and 4) to be installed on the Dis- ferrite bead installation play/Control Board. Install these in Paragraph 5-28. resistors according to the Resistor Installation Instructions given on page 5-6. Do NOT install R76 at this time. It will be installed on the back of the board when the Voltage Regulator installation (page 5-30} has been completed. Resistor Values ( ) R2-R19, R2l, R22, R24-R26, 220 ohm (red, red, brown) 1/2W R28-R30, R32-R4l, R73 ( ) R50, R75 100 ohm (brown, black, brown) 1/2W ( ) R66 470 ohm (yellow, violet, brown) 1/2W ( ) R20 lK ohm (brown, black, red) 1/2W ( ) Rl, R23, R27, R31, R42-R49, 2.2K ohm (red, red, red) 1/2W RS1-R65, R67-R72, R74 ( ) R76 5 ohm (wire wound resistor; has no color codes) 5W\" ~ Due to supply variations, the 5 ohm, 5 watt resistor supplied with your kit will be one of three sizes: a) Diameter = .22\", length = .7\" b) Diameter = .17\", length = .9\" c) Diameter = .3\", length = .9\" Size \"A\" and size \"B\" resistors should be installed on tIIherebsaiscktorosf the board in the position shown on the silkscreen. Size IIC should also be installed on the back of the board, however, the resistor leads must be left long enough so that the resistor will fit underneath the mother board. The resistor can be positioned correctly by holding the Display/Control Board vertically against a table top and bending the resistor down until it is flush against both the board and the table top. Be sure to insulate the resistor leads with tubing so that there are no bare leads exposed. Be especially careful to see that the resistor lead cannot short to the mounting screw of the 5 volt regulator. April. 197i 5-23 8800b

5-12. Disp1 ay/Contro1 Resistor Instal1ati on 5-23. RESISTOR PACK INSTALLATION NOTE (Figures 5-13 and 5-14) It is necessary to clip off the last According to supply variations, your three leads on the resistor pack at kit will contain either one resistor the end furthest from the smail dot. pack, RPl (Bag 2), or 5 individual ITfohreretheasree no ho1es on the PC board' 4.7K-ohm resistors to be substituted leads, and these three for RP1. resistors are not used. A. Resistor Pack (Figure 5-13). Use ' Resistor Pack Value ! I the following instructions to install the resistor pack as ( ) RPl I4.7K ohms shown in Figure 5-13. al 1. ine resistor pack has a small dot printed at one end. This ---1'74 dot must correspond wi th the dot printed on the PC Board. 5-13. Display/Control Resistor Insert the resistor pack per- Pack Installation pendicular to the silk-screened side of the board, aligning the sma11 dots. 2. Solder each pin of the resistor pack to the foil (bottom) side of the board. Be careful not to leave any solder bridges. 5-24 April, 1977 8800b

B. Substitute Resistors Fi ure ~.~'. . . .- (A) 5-14. If your it is not supplied with a resistor pack, (8) use the following instructions to install the 5 substitute re- 5-14. Display/Control S~~stit~te si stars. Resistor Asse~bly 1. The resistor pack designation on the silkscreen has 5 holes. The left-most hole is marked on the silkscreen with a small dot. Vertically insert one re- sistor into the right-most hole on the board. Bend the top lead at a right angle as shown in Figure5-l4A until itis p~ra­ llel with the board. Then bend the end of the lead at a right angle so that it may be inser- ted into the left-most hole marked with a small dot. 2. Solder the two inserted leads to the foil (bottom) side of the board. 3. Insert the remalnlng four re- sistors vertically into the designated holes on the silk- screen. Solder each of the top leads to the common horizontal lead as shown in Figure ~~14A. It may be helpful to bend the top leads against the horizontal lead for better contact before . sol deri ng. 4. Solder the inserted leads of the four resistors to the foil (bot- tom) side of the board. Clip off all excess leads from the top and bottom of the resistors. The properly completed resistor assembly is shown in Figure 5-148. April, 1977 5-25 8300b

5-24. JUMPER CONNECTIONS (Figure Jumper Connections 5-15) ( ) JE to JF There are two jumper wires to be in- ( ) JA to JD stalled on the Display/Control Board. Use the resistor leads saved from NOTE Paragraph 5-22 as jumper wires. Cut 00 NOT jumper JH, JJ, or JG at two leads to l-inch lengths and jum- this time. These connections are per the following pads on the Dis- used for special applications con- play/Control Board. cerning the RESET switch. Refer to Figure 3-16, sheet 2 of 3, zone A2. NOTE Note that connection JJ to JG is a land on the PC Board. The above jumper connections are used for standard operations. Jum- pers JE to JF control SINGLE STEP I (and SLOW) operation by causing the machine to execute either a complete instruction cycle or a single ma- chine cycle each time the SINGLE f STEP switch is pressed. If the jum- per is installed, a complete instruc- tion cycle will be executed. If the jumper is removed, a machine cycle II will be executed. Jumpers JD to JA, ! JD to JB, or JD to JC control the I speed of the SLOW functi on. For a I complete descri pti on of these jumper options, refer to the Theory of Oper- I ation Manual, pages 3-59 and 3-60 f and to Figure 3-16 (sheets 1 and 2). 0..• 0 0 ~ :: II: 1<1 ,,0Ll 01: II: D!fl *,* *0*..Z ~BI ! I \".,. Hi I AI_ ---! c:::J •! . c0:::+J.,.co-:::J--=[_ J JE J' YI 0 ! '\"'4 5-15. Display/Control Jumper Connections 5-26 Apr; 1, 1977 8800b

5-25. SUPPRESSOR CAPACITOR INSTALL- Install all 22 suppressor capacitors ATION (Figure 5-16) according to the Ceramic Disk Capa- citor Installation Instructions There are 22 suppressor capacitors given on page 5-7. (Bag 6) to be installed on the Dis- play/Control Board. These capaci- Suppressor Capacitors Value tors are used for noise suppression. .luf, 12V They are located next to the ICs on ( ) 22 suppressor the silkscreen, but they have no capacitors individual component designations. Note that there is not enough space between Pl and Rl; Tl and Ul; and Ul and Vl for the suppressor cap- acitors to fit on the top of the board. These three capacitors will, therefore, be installed on the back of the board. 5-16. Display/Control Suppressor Capacitor Installation Apl\"i 1. 1977 5-27 3800b

5-26. CAPACITOR INSTALLATION Capacitor Values (Fiaure 5-17) ( ) C2, C4 22uf, 35V, dipped tantalum There are two types of capacitors to be installed on cthae, Display/Control Board. C2, C4, and C9 (Bag 5) ( ) ca, C9 47uf, l6V, dipped tantalum are dipped tantalum capacitors. They are marked with a plus sign on the positive side. Be sure to ori- ( ) Cl , C10, Cll .1 uf, lZV or ent this plus sign with the plus •lui, 16V sign on the silkscreen before in- ( ) C3 .1 uf, SOV (Si< .1m) stalling each dipped tantalum cap- acitor. Cl, C3. CS,. C6,. C10, and Cll (Bag 6) are ceramic disk cap- ( ) CS, C6, .QOtuf acitors. They need no polarity ori- entation. Install the dipped tan- talum capacitors according to the Epoxy Dipped Tantalum and Ceramic Disk Capacitor Installntion Instruc- tions giyen on page 5-7. NOTE M ,, !Z I There is one .001 ~f capacitor (C7) • included with your kit that is not szIl.llI ~ needed. Capacitor C7 should not be I i nsta11 ed. = =1:ftt 0....-.. x 0 0 0y JA J' I.~II·I·'·.·-- I I J I Kl .,,..,...(If 1ft ~0 ~~ 91 L.J i=,!=I@r\\oJ~ ii • R74 5-17. Display/Control Capacitor Insta11aticn 5-28 April, 1977 380Cb

5-27. DIODE INSTALLATION (Figure 5-18) Install the 2 diodes, 01 and 02 (Bag 2), on the Display/Control Board according to the Diode In- stallation Instructions given on page 5-8. Diode Part Number ( ) 01, 02 IN914 5-28. FERRITE BEAD INSTALLATION o0 (Figure 5-18) ~ ~ ., Install the three ferrite beads, L1 through L3 (Bag 2), on the Display/ LI II: II:U Control Board according to the fol- lowing instructions. 5-18. Display/Control Diode 1. Using the resistor leads saved and Ferrite Bead Installation from Paragraph 5-22, cut three 1-inch lead lengths. ~t.. Insert the 1ead through the bead and bend the ends of the lead to conform to the desig- nated holes on the Disp1ay/ Control Board. 3. Insert the lead into the proper holes from the silk-screened side of the board, and solder . to the foil (bottom) side of the board. Be sure not to leave any solder bridges. 4. Clip off any excess lead lengths. Apr; 1, 1977 5-29 8aOOb

5-29. VOLTAGE REGULATOR INSTALLA- Voltage Regulator Part Number TION (Figure 5-19) 79M08 ( ) VRl 7805 Install the two voltage regulators, ( ) VR2 VR1 and VR2 (Bag 1 ), on the Display/ Control Board according to the fol- NOTE lowing instructions. Refer to the silkscreen on 1. Set the regulator in place on page 5-24 and install R76 on the ~ of the board. the silk-screened side of the board, aligning the leads with y JA JeJC their designated holes. 2. Use needle-nose pliers to bend o\"0 0 each of the three leads at a right angle to conform to its _iO..I.\"o - ~ ~ '\" proper hole on the board. ... :;; JI KI L! '\" \"'''' 3. Prepare a 3\" ground strap accord- ing to the instructions given in Paragraph 5-72, page 5-71. Secure VR1 in place on the silk- screened side of the board with a #6-32 x 1/411 screw, a #6 lockwasher and a #6-32 nut. Secure VR2 on the silkscreened side of the board and the ground strap on the back of the board with a #6-32 x 1/4\" screw and a #6-32 nut. Orient the strap horizontally so that it is pointing away from the board. 4. Solder the three leads to the foil (bottom) side of the board. _Be sure not to leave any solder bridges. 5. Clip off any excess lead lengths. ,, 5-19. Display/Centrol Voltage Regulator Installation 5-30 Apr; 1, 1sn 8800b

5-30. SWITCH INSTALLATION (Figure 1. Place one nut over each of the 5-20) 25 switches. Thread the nuts down as far as they will go. There are 25 switches (Bags 7 and With the notched side facing 8) to be installed on the Display/ the bottom edge of the board, Control Board. S2 through S9 are insert all 25 switches into the momentary contact switches (i.e. silkscreened side of the board they return to center position auto- as shown in Figure 5-20A. Do matically when released). SAO not solder the switches at this through SA15 and Sl are latching time. type switches (i.e. they remain in either the up or down position). 2. Place the Sub Panel over the To insure that all 25 switches are Display/Control Board so that perfectly aligned, the Sub Panel the switches come up through will be temporarily installed at the proper switch holes on the this time. Install the switches Sub Panel. Secure the Sub Panel according to the following instruc- in place by placing one 1/4 x ti ons. 28 nut over each switch (Figure 5-20A) • NOTE Set aside 25 of the nuts Display/Control Board provided with the switches. ~ The rest of the hardware associated with the switches will not be used. 0 88 0 ~ 00 0 80 0 0 0 0 ~~ ~~~ ~~ Sub Panel ~ ~ ~ ~1/4 x 28 Nut Aprii. 1977 5-20(A). Display/Control Switch Installation 8800b 5-31

3. Solder all 3 pins of each switch Switch Type to the foil (bottom) side of ( ) SAO through the Display/Control Board. latching type Make sure the Display/Control SA15 and S1 momentary con- Board is pressed tightly against ( ) S2 through S9 tact type each s~itch as it is soldered. If there is any II pl at' between the switches and the Display/ Control Board, the alignment on the final display will not be straight. 4. After all of the switches have been soldered, remove the 25 nuts that were placed on top of the Sub Panel. Set them aside for later use in Paragraph 5-31. 5. Remove the Sub Panel from the Display/Control Board. 5-20(8). Display/Control Switch Installation 5-32 April, 1977 6800b

5-31. There are 36 LEOs, RL-21 (Bag 9), to. #6-32 nuts be installed on the Display/Control Board. The Sub Panel will also be ~~-\"~~ installed at this time. Install the LEOs and the Sub Panel according to 5-21. Display/Control Switch Nut Placement the following instructions. 1. Place one of the nuts saved from Paragraph 5-30 over each of the following switches: SAO, 59, Sl, 5A15, S5, as shown in Figure 5-21. There should now be two nuts on each of these switches. Thread the nuts down as far as they will go. Place masking tape over the LED holes on the Sub Panel as shown in Figure 5-22. Tape 5-22. Covering LED Holes on Sub Panel Apl\"n, 1977 5-33 8800b

2. With the cathode lead correctly RL-21 oriented (Figure 5-23A) insert all 36 LEOs into their respec- / *CATHODE, tive holes from the silk-screened side of the board, as shown in I<J(A) CATHODE ANODE Figure 5-238. *Symbol as shown NOTE on board. Do not solder the LED leads at this time. C~ Cathode 3. Place the Sub Panel over the Display/Control Panel and tape together as shown in Figure 5-24. (8) Display/Control LED Orientation and Installation ......, ~ ~ ~~ ~e-- ~~ ~ ~~ I3sIiiiw ~ ~ ~ Sub Panel ~ I) 5-24. Securing Sub Panel Over DisplaY/Con'trol Board 5-34 April, 1977 8800b

4. Turn the Sub Panel to the bottom WARNING~ and adjust the LEOs until the top of each LED touches the tape LEOs are heat-sensitive. as shown in Figure 5-25. Use a minimum amount of Sub Panel heat for a minimum length of time when soldering l========:~~====1:*====::=#=~---r them. 13116\" Be sure not to leave any solder bridges, and clip off any ex- 5-25. Display/Control LED Adjustment cess 1e~d lengths. 5. Solder the LED leads to the foil 6. Remove all pieces of masking tape. (bottom) side of the Display/ 7. Remove the Sub Panel from the Control Board. During this pro- Display/Control Board. cedure it is advisable to prop the boards from underneath so 8. Remove one nut from SAO, S9, that the switches are not rest- Sl, SA15 and S5. ing on the work surface. 9. Place the Sub Panel over the Display/Control Board and se- cure by placing one nut on the following switches: ON/OFF, RUN/STOP, A15, A8, AO, INPUT/ OUTPUT, and DEPOSIT. . Sub Panel Nut for ON/OFF, RUN/STOP, A15, AS, AO, INPUT/OUTPUT and DEPOSIT switches only. 5-25A. Sub Panel Mounting April, 1977 5-35/ (5-36 blank) BeOOh

5-32. CPU BOARD ASSEMBLY IC Part Numbers ~-33. IC INSTALLATION (Figure 5-26) ( ) D, E 8216 Install the following 17 integrated ci rcui ts (Ba g 2) on the CPU Board ( )F 8224 according to the Integrated Circuit Installation Instructions, Section ( ) N,P,R,U, A, given on page 5-10. V,W,X 74367 NOTE Do not install ICs A, K, ( ) S,Y 74LS14 or 74LS04 and M at this time. In- stallation instructions ( )C 74LS13 or 74LS20 I for these ICs are given in Paragraph 5-43. ( ) B,G 74LS04 I The following chart lists each I integrated circuit, its part number, and acceptable substi- ( ) L,J 8T98 or 8098 tutions. or 74368 \" 5-26. CPU Ie Installation April, 1977 5-37 88COb