SOLVED issue converting Spectar (main board) to Venture

joemagiera

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6-28-2025 10:30PM update: issue solved. On Spectar, the IC @ 15C (74LS00) is not populated. I had populated when I started this effort, but upon closer schematics inspection, pin 8 is jumpered to ground. This is not the case on Venture. I just needed to cut that jumper and all appears to be good now.
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A while back, with help from people here (Mark S. identified the final problem), I converted an Exidy Fax main board to an Exidy Venture main board. It wasn't too involved, so I took a stab at converting an Exidy Spectar main board to an Exidy Venture main board. Yikes! Much more involved than converting Fax. Both header connectors, the ribbon cable and all three dip shunts required some rewiring.

I didn't do extensive testing yet, but one issue I see is when your guy is outside the rooms, he's supposed to be a little red dot. Instead, he's the big pumpkin (which is what you're supposed to see when he's inside a room).

See video here:


Any ideas on how to fix this?
 
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