Williams System 6 MPU
I am looking for some guidance on a three Williams System 6 MPU boards.
The symptoms are the following on all three MPU's;
Both LED's flash twice. That is it!!!
I have read all that I could online. I took the fist set of advice and replaced the original sockets (Scanbe sockets)
The EPROM's are good. (I have an EPROM programmer and verified the ROMs are good for three of the games. (Blackout, Firepower and Time Warp) all good checksums.
There is no battery corrosion on any of the MPU boards.
My soldering and de-soldering skills are above average (use to solder circuit boards during high school) I was given a PACE de-soldering station in the 90's.
However my skills on the logic side of these boards need a lot of improvement……
I have verified the 5101 is good, (purchased a couple from Marco Specialties)
I have a logic probe, but not sure what I am looking for….
I downloaded Leon's Test Chip, and get the repetave flashes per the instruction, so from what I have read the boards are working, but only to a certain level…..
Is there any advice to my problems……
Oh yea, here are some pictures of one the board's I am refering to.... All three arein the same condition....
Thanks,
Mike
I am looking for some guidance on a three Williams System 6 MPU boards.
The symptoms are the following on all three MPU's;
Both LED's flash twice. That is it!!!
I have read all that I could online. I took the fist set of advice and replaced the original sockets (Scanbe sockets)
The EPROM's are good. (I have an EPROM programmer and verified the ROMs are good for three of the games. (Blackout, Firepower and Time Warp) all good checksums.
There is no battery corrosion on any of the MPU boards.
My soldering and de-soldering skills are above average (use to solder circuit boards during high school) I was given a PACE de-soldering station in the 90's.
However my skills on the logic side of these boards need a lot of improvement……
I have verified the 5101 is good, (purchased a couple from Marco Specialties)
I have a logic probe, but not sure what I am looking for….
I downloaded Leon's Test Chip, and get the repetave flashes per the instruction, so from what I have read the boards are working, but only to a certain level…..
Is there any advice to my problems……
Oh yea, here are some pictures of one the board's I am refering to.... All three arein the same condition....
Thanks,
Mike
