Gun Smoke (Bootleg) repair

I bought this bootleg Gun Smoke board years ago but a colour prom was missing and as I had no way to burn another it has pretty much sat waiting for a prom ever since.

Time to deploy my new favorite toy that I picked up from ebay a couple of months ago.

Stag System 3000 (cira 1991)

This beast of a programmer can program many chips but most importantly for this repair it can do bipolar proms.

I usually use it on an old laptop in dos connected by serial cable but as I had an original Gun Smoke pcb as well I decided to copy the original proms directly rather than try and find the correct files in mame. Turn the key and you're in standalone mode, copy the content of the original prom and burn it to a new blank one which took a total of about 8 seconds.

When the prom was missing the screen was all red (which I forgot to photograph) but just think of a virtualboy game.

After installing the new prom the game looked a lot better but there was no green, checked the green pin at the edge connector with a meter and sure enough 0v. Traced it back to the prom next to the new one, pin 12 had internally shorted to pin 8 (ground).

Bad prom removed.

I did the same as before to replace the missing prom by simply copying the one from my original board and burning it to a new old stock 82S129.

Green restored, repair complete.