There was a shift in the early to mid 90s of barrel connectors going from center negative to center positive, where most devices before that time had center negative and most devices after had center...
Epyx World Games is a booter, so you will not see any files on the disk when you look at it under DOS. Have you tried booting it on an appropriate platform?
I had the same thought. According to pages 17-18 in this PDF there is an address strobe line /ADS which goes low to indicate a valid address. I imagine that would need to tie into the chip select...
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I take it that your programmer did not modify...
I take it that your programmer did not modify location 03ffh, and did program the configuration fuses as the source shows:
Chuck(G) Today, 06:42 PM__CONFIG _MCLRE_OFF & _CP_OFF & _WDT_OFF &...