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I bought a complete with no monitor Xybots from Coinopwarehouse last year and decided to start working on it this weekend. Clean up went great. After checking out voltages were OK I found the game played blind so I grabbed a spare G07 and modified the video cable for molex CX goodness. I tied the composite video to both pins on the G07 but could not for the life of me get sync to happen. Here was my troubleshooting post:
https://twitter.com/90minutetape/status/1259176608738525186?s=21
After confirming my monitor was fine with my TGP and that the harness was testing continuous, I decided to read the schematics to see if I could find a culprit. Lo and behold I noticed this:
Using my probe I found the composite pin (VID-9) was stuck low as was pin 6 on 18M IC which leads up to it... BUT! Atari had the foresight to feed uncombined HORIZ sync and VERT sync to unused pins 10 (VID-10) and 11 (VID-11) on the PCB — and they had activity! Could I just run these to the monitor and bypass the composite circuit?
I added yellow (vertical) and white (horizontal) wires to the existing harness and a custom H/V plug (this harness has two sync plug sets at this point). Xybots is a positive sync game by the way. Fired up the monitor and ...
Now that I can see what I'm doing I cleaned up the joysticks and put in new 1 and 1/4" rubber rings on the joystick assembly (the original one had turned into the usual ooey gooey mess). Everything is back together and working but the centering is still terrible. What do other Xybot owners do to improve the centering? Replace switches? Mine seem OK and work but they don't have a lot of push. Looking for advice!
https://twitter.com/90minutetape/status/1259176608738525186?s=21
After confirming my monitor was fine with my TGP and that the harness was testing continuous, I decided to read the schematics to see if I could find a culprit. Lo and behold I noticed this:
Using my probe I found the composite pin (VID-9) was stuck low as was pin 6 on 18M IC which leads up to it... BUT! Atari had the foresight to feed uncombined HORIZ sync and VERT sync to unused pins 10 (VID-10) and 11 (VID-11) on the PCB — and they had activity! Could I just run these to the monitor and bypass the composite circuit?
I added yellow (vertical) and white (horizontal) wires to the existing harness and a custom H/V plug (this harness has two sync plug sets at this point). Xybots is a positive sync game by the way. Fired up the monitor and ...
Now that I can see what I'm doing I cleaned up the joysticks and put in new 1 and 1/4" rubber rings on the joystick assembly (the original one had turned into the usual ooey gooey mess). Everything is back together and working but the centering is still terrible. What do other Xybot owners do to improve the centering? Replace switches? Mine seem OK and work but they don't have a lot of push. Looking for advice!