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  1. cinematronics wierd behavior after status light mod

    Was working on my cinematronics space wars because it had no video and would not run blind. I had it all fixed and working and decided to do the status light mod. game seems to work fine if I pull the 74 s00 chip out of a2. when it is inserted the led flashes on power up and goes dark like...
  2. aa017751 power supply

    After years of searching I finally located on a website the schematics for a taito aa017751 power supply this is the page that the power supply information is on. https://www.robotron-2084.co.uk/hardware?page=3 thanks to robotron-2084. they are also the only place that I have found for the...
  3. bizarre 8080 ram problem solved

    I am fixing an 8080 board. as you can see I have 8 chips under test. the version 3 ram test program is only reporting on the chips in 4 rows. as you can see chip 1 passes but chip a on the same row fails and then the test skips a row and test the next row with a similar result. as you can...
  4. would dielectic grease on connectors be a good or bad idea.

    I do not know if this had ever been discussed before or done but I was wondering if putting dielectric grease on the contacts of connectors and the fingers of pcb woudl be a good thing or might have some bad effects that I do not know of. I consider this thinking about games that have a sense...
  5. asteroids explosions

    looking for some quick information about which expaud signals are used for a saucer explosion. my saucer explodes and makes no sound but my ship blows up and I can hear that so I am just looking for which expaud signal generate the saucer exlposion
  6. FS Parts: Sold Midway space invader regulator board and power brick

    For sale power brick and regulator board forspace invaders. Also have wiring harness for sale. Brick 35 power supply 30 Wiring harness 15 Shipping to be determined later
  7. Bench testing gottieb opto boards

    do not have access to the game but a friend sent me his opto boards for a rescue 911 since none of his switches are registering on two boards I am going to be testing these switches on my bench and was wondering if you know the procedure. its a ma 1925. I was going to put 5 volts into p1 6 and...
  8. need some infor 90's golden tee

    I was asked by a friend what it would entail to make him some golden tee roms for the 90's versions of golden tee which are swappable. have not seen his game or board yet but was wondering how many blank roms of what type would be required to make a set for just one year? Would the gq-4x be...
  9. my 7th asteroids repair in a series of 8 boards plus question on scope

    I originally got a supply of 8 non working asteroid boards in a project machine. The first one I picked is still giving me problems but that is the last one and hopefully I learned something from the other 7 the first two were bad ram and a bad dac and a bad tl081 every other game has had a...
  10. test sound for asteroids

    how is the test sound generated for the memory chips in an asteroids game?
  11. asteroids board #3 of a set of some else's problem.

    Was working on board #3 because #1 is still annoying me. Plugged this board in and I got two good memory tones and two bad for r4 and m4. Thought hey this should be simple since they are both selected by the same input. I was wrong they had the proper cs input but the board still reported...
  12. graphic problem on asteroids (solved)

    repairing one of 5 boards I have and have gotten this board working until this point. when I first turn on I can usually get a test pattern and screen image. it soon degrades to where the left side of the screen starts fluctuating. I have tested with a new tlo82 at c12 swapped out since it...
  13. asteriods troubleshooting vg watchdog

    trying to troubleshoot a watchdogging of an asteroids in the vg side and need some knowledge. with pin 1 lifted of l6 I get a blind running game. connecting it back up I look at my scope and the dmago stays high. I never see it go low. how does the cpu know there is a halt signal that is making...
  14. wtb atari roadblasters cocktail system1 and game board

    wtb atari roadblasters cocktail system1 and game board. please pm me
  15. wtb arkanoid spinner

    wtb arkanoid spinner. please pm me
  16. go7 2sd870 transistor shocked me.

    I got zapped by the case of the 2sd870 transistor when I touched it. does that mean that it is bad and should be replaced? or is there another reason why the outside is charged. the chassis is not electrified and I get a diode drop between the case and chassis. horizontal has some streaks in it
  17. strange sound problem with asteroids thump sound

    working on an asteroids and the thump sound sounds tiney. its in a known working cabinet that sounds good with another board in it so the problem is on board. pin 5 is pulsing so that is generating the tone. pin 10 7 are low pin 12 H. pins 13 11 6 are pulsing. pulled chip and tested and it...
  18. will a vector monitor have the spot killer on if you don't have the x and x deflection plugged in

    I am trying to repair a 19v2000 monitor that was a bit of a basket case that I have no idea about. I found a poor bridge rectifier which I replaced and both slow blo fuses blown. I also had d 608 shorted and when I replaced it I had a diode test fail one way so I had to replace q606 to make the...
  19. asteriods watchdogging

    I am working on a second board for an asteriods. the first board works great in the game so there are no faults in the game except for the game board. I have tested the rams and verified the roms off board and on and they are known good. When I lift pin 1 of L6 the dmago line the game will...
  20. Taito-AA017751 not regulating 12 volt power

    I have a power supply for a space invaders cocktail. it was working fine until I slipped and shorted 12 onto a lm3900 on the logic boards. fortunately I believe all the logic is now repaired. the power supply on the other hand is a problem I blew 2 tant caps near the -12 and 12 volt regulator...
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