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Trying to revive an old Midway Space Encounters. Game wasn't working at all but is now showing some signs of life. Did some initial adjustments on the monitor and it is working. Temporarily popped in my spare 280 ZZZAP boards to confirm the screen works. It needs cleaning, recap, and adjustments but at least it is working.

Rebuilt the power board and have all three voltages present and adjusted within range so that part is good. Now it's on to the Game board itself.

I have the original boards for the game as well as an extra correct -L000 main board and spare Space Encounters daughterboard. So far neither set is running. Once I get one going that should help get the extra boards rebuilt too. At first there wasn't much working on either set of boards. Carefully cleaned all the socketed chips, replaced a few legs on three PROM's, installed all new dual leaf DIP sockets, replaced the 10uf electrolytic capacitors on the main can daughter board, and replaced the larger tantalum capacitors on the main board. Also cleaned the crystal connections.

One board is strapped for the 9314 ROM's and appears to be correct. The other main board is strapped for normal 2716 EPROMs (not the TMS version) and I burned a fresh set of 8 EPROMs for that board.

Now I need to start digging a bit deeper into the boards. Haven't made a test harness for the 8080 boards so am doing it all in the cabinet at the moment.

I've read that bad RAM is common on these boards. Not sure from the pictures if it looks like bad RAM or some of the addressing logic. I have a tester that will check the RAM chips. I'm temped to carefully pull out a set, clean the leads, test them, and socket them. Also have an HP logic comparator that should help verify of flag some of the regular logic IC's.

Have any of you run into screens like this when working on a Midway 8080 board set? Do any of the images look familiar?
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