Recent content by obr928

Free Tempest Non working smithtown area. msg me if interested. New Home.

Wow you got all that from my statement, Your cool!

no flybacks on that game.

hello, moved my defender and now missing the color green. its not a monitor issue swapped in a known good one. checked the 2n4403 trans, all three working. anybody familiar with how the color is processed on the williams boards? looking for a head start since i have little time to work on it...

its a speed hack, an early version, i have a few i took off boards that i repaired.

B&W monitors dont have flybacks. :)

fixed the memory address problem. but i cant track down the video problem. posting a picture of it. maybe somebody has seen this before. thanks Bob.

doing a little more digging i found that PHI is not being inverted properly at b6. i piggybacked on it and it looks like it might be another chip. i hate cutting chips off with out knowing if they are really bad. gonna try testing m5 when i get home from work.

you are right but i was chasing my tail on that side needed a break. The program side is killing me, the program runs fine plays fine with just the messed up vectors and the test mode problem. i now im missing something on the addresses. thanks

ok, of the four data latches h7 and f7 are not outputting. /alphanum is pulsing and keeping pin1 /RD active. the other two latches pin 1 is set high and they are outputting correctly. now im looking at the vector timer. can anybody confirm this. Thanks

Thanks, Yes both are low, the i could read and write to the rams but i did socket and replace both no change. after more hunting around i found on the vector side the gate @ b8 is stuck low and not feeding the the vector counters @ f5 and latch0 @ h7 most of the outputs are stuck low but the...

Hello, having asteroids problems. program runs fine, but the vectors are messed up. the large asteroids are huge. ship is large, high score text is messed up. the game will play fine. had a high score kit on it removed it and burned new roms. fluke 9010 the roms all check out. ram test is giving...

fixed, IC1 pin 10 was shorted. replace. monitor is up, colors are great. thanks again for the help everybody.

yes, check it with a meter.

changed the vr reconnected d10 but still have 170+ volts with 2nd vr. the search goes on.