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| Integrated Circuit Failure Compilation |  Other PCB's tested |
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| Found while doing recent repairs | ||
| Computer Aided Testing System |
Back to Asteroids Troubleshooting notes
Bad chips, replaced. List includes: "ast "= Asteroids PCB, "pac" = Ms Pacman or Pacman PCB, "miscom" = Missile Command PCB, "bzone" = Battlezone PCB, "gal" = Galaga PCB. These chips I have entered on this list were proven bad, the chips I have replaced do not make this list, unless I am 100% certain that the chip had failed. AD40715 561J 8013 asteroids output is gone AD40715 561J 8016 asteroids output is gone AD561JN 8018 40715 asteroids output is gone AM9114EPC 8147 WPP Pacman color ram 1 AM9114BPC 8138 DPP Ast final location 3FF in RAM fails, all other loc OK AM9114EPC 8236 DPP Pacman work ram AM9114EPC 8236 DPP Pacman work ram 2 off same board AM9114BPC 7944 DP Pacman AMI 8112LY 799-01 Korea NP2 ast del tests ok but failed attract mode ~~DM74109N /8013M 9024 bzone aux chip was hot ~~DM74LS373 SB8238* Sinistar causes RAM errors seemed like pin 1 fault ~~DM74LS161N /949* ast 1st vect timer doesn't count ~~DM74191N 822 Miscom 2nd counter in Vert count chain complete failure ~~DP8304BN 7902DK replaced with 74LS245 on ast ~~DP8304BN /919 replaced with 74LS245 on ast ~~DP8304BN /919 replaced with 74LS245 on ast same board as above ~~NMC27C512AQ 250 LB9036 programs & verifies but ms pac resets ~~M2114N /035B ast work ram ~~M2114N /035B ast vector ram same board as above ~~M2114N /043C Bzone vect ram ~~LM324N /8037M bzone aux low sound output ~~LF353N /015 ast xout TL082 equiv - final ok, preamp bad F MB74LS00 8107 T11 gal 3M all outs have low drive F MB74LS20 8107 T11 gal vid character sum both outputs bad - floating F 74LS191PC 8001 Indonesia ast 1st count e9 F 74LS244 8048 PG Indonesia pac 285 board F 74LS374 8048 PG Indonesia pac 285 board F MBM2147E 8106 W42 galaga blue lines in vid 6J F MBM2147E 8109 W55 galaga partial address failure F 93415PC 8122 K Singapore Pac mov chr 1 of 3 F 93415PC 8122 K Singapore Pac mov chr 2 of 3 same board as above F 93415PC 8122 K Singapore Pac mov chr 3 of 3 same board as above F 93415PC 8140 K Singapore Pac mov chr GTE 2114UCB 8037 bzone vect RAM GTE 2114UCB 8039 ast work RAM GTE 2114UCB 8041 ast work ram GTE 2114UCB 8041 ast #1 work ram dif board than above GTE 2114UCB 8041 ast #2 work ram same bd only prob was at H377 d(0) hi GTE 2114UCB 8106A 3rd tone ast del GTE 2114-2CB 8121 pac ram 4 bad on the same board all the same GTE 2114-2CB 8132 pac ram H M3-7621-5 7917 ast prom 35905 inputs pulling up chips connected to it I P2114AL-4 F1376000 Pac work ram 4M INTERSIL 2147 8213 gal vid mov chr MC14016B CP 8020 ast both fire sounds distorted MC14016B CP 8020 ast x-out when cold, asteroids sometimes stretch across screen dif bd than above MC14016B CP 8025 ast saucer siren snd bad MC14016B CP 8025 ast saucer fire snd bad same board as above MC14016B CP 8012 ast output loading down +8.2 volts to about 5 volts MC14016B CP 8027 ast saucer fire and ship fire snd MC14584B CP QQ8023 miscom all ins & outs between Hi and Low MCM2114P2D QQ8422A pac bad RAM NE555N S8008 - ast no modulation for 566 circuit saucer snd NE566N S8020 - ast no saucer attack snd oscillation NE566N S8039 - ast no saucer attack snd oscillation N82S126N 8151 pac snd prom 3M fail after 30 sec warmup (2S12 6-CL on bottom) NEC UPD2114LC-2 8220RY Ram asteroids 2nd tone bad NEC UPD2114LC M9X446-942 ast work ram NEC UPD2114LC M9X446-942 ast vect ram same board as above NEC UPD2114LC M9X446-942 ast vect ram same board as above NEC UPD2114LC M9Z105-949 ast work ram NEC UPD2114LC X99195-937 ast work ram NEC UPD2114LC X99025-936 ast work ram NEC UPD2114LC M9Y435-947 ast vector ram d(2) half of addresses bad RCA 036 CD4016 BE - drawing 8.2 volts down RCA 036 CD4016 BE - noisy pic in Y output dif board than above RCA 036 CD4016 BE - ast ship fire sound not tapering off dif board than above RCA 014 CD4016 BE - saucer sound won't shut off RCA 101 CD4016 BE - ast del y out squashed on top S 82S25N 8131 Moving chr pac 3H S 82S25N 8131 Moving music pac 2K dif board than above S 82S25N 8209 Moving chr pac 3H SA 74LS08N 8031 ast gate 1,2,3 output bad, not going low enough SA 74LS10N 8020 ast loc A9 - pin 3 scoped causes problem to go away SA 74LS32N 8010 ast clock count 191 address the 670's SA 7442N 7938 Miscom not decoding correctly SA 7442N 7938 Miscom not decoding correctly dif board than above, E8 SA 7442N 7921 Miscom E8 not decoding, no color ram or int ack writes SA 74LS42N 8051 ast del not decoding correctly SA 74LS42N 8051 ast wd reset, dmago etc pin 11 stuck low SA 74LS42N 8051 ast del state machine SA 74LS74AN 8146 hblank problem in pac SA 74LS74AN 8146 vblank problem in pac, dif board than above SA 7474N 8016 Miscom tracball ckt SA 7474N 8016 Miscom dif bd than above - giant images E7 - pins 5 and 6 stuck SA 74LS83AN 7917 ast images bad huge asteroids, flat ships SA 74LS83AN 7918 ast images all too small SA 74LS109N 7950 asteroids everything small first half NG SA 74LS138N 8137 Pac no WD reset SA 74LS138N 8142 pac 7J pins 11 (IN0),13 (NU) both had outs not low enough SA 74LS138N 8207 pac no writes to snd or mov chr SA 74LS139N 7938 Asteroid prog select 145 pin 5 out not going low enough SA 74LS139N 7938 Asteroid SIN1 select 251 pin 5 out not going low enough SA 74LS139N 8038 bzone aux pin 6 has opened SA 74LS139N 8048 pac 7M add decode - both halves bad - outputs all 1.9 volts SA 74LS157N 8104 ast del D/E10 4 vert stripes for image SA 74LS157N 8104 ast del D10 jagged images same board as above SA 74LS157N 8104 ast del A10 stairstep diagonal dif bd than above SA 74LS157N 8105 Pac VRAM 284 no moving characters SA 74LS157N 8145 pac vram board SA 74LS161AN 8046 1st in chain vect timer asteroids counting NG SA 74LS161AN 8046 vert count Pacman #1 SA 74LS161AN 8046 vert count Pacman #2 same board as above SA 74LS161AN 8046 WD reset Pacman #3 same board as above SA 74LS161AN 8046 vert count Pacman 2R dif board than above SA 74LS161AN 8046 pac mov chr position counter dif bd than above SA 74LS161AN 8103 ast first in chain vect timer SA 74LS161AN 8103 ast del first in chain vect timer SA 74LS161AN 8103 ast del first in chain vect timer dif bd than above SA 74LS161AN 8104 pac last vert count pin 13, 12, 11 hi or not counting SA 74LS161AN 8114 centipede 1st counter clock section all outs NOP SA 74LS161AN 8119 vert count Pacman 2S SA 74LS161AN 8119 vert count Pacman 2R same bd as above after 24hrs B/I SA 74LS161AN 8119 horiz count Pacman 3S dif bd than above SA 74LS161AN 8119 mov chr 2E same bd as above SA 74LS161AN 8120 horiz count Pacman 3S SA 74LS161AN 8148 vert count Pacman 2R SA 74LS164N 8105 ast del noise circuit R8 SA 74LS164N 8105 ast del noise P8 same bd as above (failed during B/I) SA 74LS175N in hi-score ast del SA 74LS175N 8106 ast del huge ship images SA 74LS175N 8012 Miscom corrupted characters / images SA 74LS191N 8014 ast last in chain at C9 SA 74LS191N 8104 ast del x-pos counter C9 SA 74LS193N 8051 ast 2nd counter in vect timer H5 SA 74LS193N 8048 bzone vect counter pin 2 output stuck low SA 74LS257N 8111 pin 4-5 not showing up at output 6 SA 74LS244N 8036 pac 285 board SA 74LS244N 8032 pac 285 board was very hot SA 74LS244N 8102 ast add decode SA 74LS244N 8102 ast add decode same bd as above SA 74LS257N 8111 pin 12 output loads down SA 74LS257AN 8111 pin 10-11 not showing up at output 9 SA 74LS257AN 8134 pac 285 pin 14-13 out to 12 problem SA 74LS283N 8117 Pac chr match circuit 1F SA 74LS283N 8122 Pac chr match circuit 1F SA 74LS283N 8138 Pac chr match circuit 2F SA 74LS283N 8138 Pac chr match circuit 1F same bd as above after 24hrs B/I SA 74LS283N 8146 Pac chr match circuit 2F pin 10 bad output SA 74LS283N 8203 Pac chr match circuit 2F pin 1 bad output SA 74LS367N 8201 Pac inputs 2 inputs bad SA 74LS374N 8028 pac 285 board SA 8T245N 8029 pac dbuss complete failure both directions SA 8T245N 8029 pac dbuss nearly complete failure both directions different bd than above SA N9316N 7948 ast first counter in string SB 7474N 8221 pin 3 has become an output (acid damage?) Joust CPU SN 74LS02N QQ8152 Motorola pac 285 board pin 5 U3 pulling up 6M* SN 74LS83AN 7937 Mototola ast address giant images. text jumping SN 74LS139N I8111 pac not decoding correctly SN 74LS157N QQ8208 Motorola pac 284 "credit" flashed - push on chip 3 fixed SN 74LS191N 7942 - Miscom - would not count down, up was OK. SN 74LS191N 7852 - ast odd bd with 191's for vect timer & counter SN 74LS273N 7934DMP - ast objects disfigured SN 74LS244N QQ7938 Motorola ast A(0) pin 13 thru to 7 n/g, 7 always low SN 74LS244N QQ8024 Motorola Miscom data bits stuck, hanging dbuss SN 74LS368AN IK OV8926 Motorola had a entire tube of bad ones (for clock) SN 74LS670N I8017 Motorola ast 2nd 670 in chain - failed on a power off/on SY2114L-2 8121 pac work ram SY2114L-2 8141 Ms pacman bad colors cram0 SY2114L-2 8215 Ms pacman bad colors TI TL082CP malaysia 009 ast output Y out low on screen & out fails draws wrong place TI TL082CP malaysia 101 ast output weak TI TMS2114L-20NL DP8144 pin 8 internal disconnect? TI TMS2114L-20NL DP8144 con't 3 bad chips PAC all same TI TMS2114L-20NL DP8144 con't had singapore bottom of chip TI TMS 4116-20NL P8018 Miscom TI TMS 4116-20NL P8018 Miscom same board as above TI TMS 4116-20NL P8018 Miscom dif board than above TI TMS 4116-20NL P8018 Miscom same board as above TI TMS 4116-20NL P8031 Miscom TI TMS 4116-20NL P8031 Miscom dif board than above 6 out of 8 chips bad TI TMS 4116-20NL P8031 Miscom dif board than above TI TMS 4116-20NL P8027 Miscom TI 7402N 8040 pac 285 bd - outputs on 02 are all bad TI SN74LS02N 8105C pac reset pin 13 output bad TI SN7404N 8018A Malaysia Miscom pins 5-6 and 9-8 bad inverters TI 74LS74AN 8144A Malaysia pac 285 board pullup res drawn down TI 74LS86N 8127X El Salvador pac 284 vram pin 11 stuck hi TI 74LS107AN 8114A El Salvador Pac clock circuit TI 74LS107AN 8114A El Salvador Galaga IRQ's 1A pull-up R56 drawn down TI SN74LS138N 8127AR Portugal Galaga address decode 2P pin 9 bad TI 74157N 8001X Malaysia Pacman pix flip had lines TI SN74LS157N P1 149C El Salvador pac 5A flip = letters chopped in 1/2 TI SN74LS158N 8127C El Salvador pac chr to 93415's pin 15 pulling up hi TI SN74LS161AN 8022A El Salvador bzone aux board TI SN74LS161AN 8131B Brazil pullup drawn down Pac 1 of 4-chips was bad TI SN74LS161AN 223BJ Taiwan on a boot Galaga small version Hcount #1 TI SN74LS164N 8044A El Salvador Bzone Z output all outs low TI SN74LS191N 8044B El Salvador ast del vect counter pin 2 stuck low TI SN74LS194AN 8127A El Salvador pac lines in video TI SN74LS194AN 8136C El Salvador pac squares for mov chr, wrong colors TI SN74LS244N Malaysia 8014X bzone main TI SN74LS244N Malaysia 8131X pac 285 board TI SN74LS245N Malaysia 8031X bzone main TI SN74LS245N Malaysia 8127A gal 4 bits in a row fail TI SN74LS245N Malaysia 8127A gal 4 bits in a row fail same board as above TI SN74S287N 7919X 34602 PROM chip Asteroids no vect draw TI SN74S287N 7939X 34602 PROM chip Asteroids no vect draw TI SN74LS365AN 8109B El Salvador Galaga video control for RAMs 2147 CDEF TI 74LS367AN El Salvador 8144B Galaga pin 2 and 3 internally shorted TI 74LS367AN El Salvador 214C Galaga CPU #1 (a12) pin 3 gets stuck low TI LM324N 7923AC ast bad saucer fire snd TI LM324N 8031AC ast Malaysia final out loud hum TI LM324N 8031AC ast Malaysia bad ship fire dif board than above T TMM314AP-1 2114-2 1LA3. 5 out of 6 bad Pac RAM T TMM314AP-1 2114-2 2AA2. Pac 4K T TMM314AP-1 2114-2 2AA2. Pac 4R dif board than above T TMM314AP-1 2114-2 2AA2. Pac dif board than above T TMM314APL-1 2114L2 0LA2. Pac 4M TMM2016P-2 1LC2 Bad Ram 0L Galaga Video Back to Asteroids Troubleshooting notes |