Interface card on 486 processor
I have an interface card (drives external machinery) that has a fault. The board manufacturers are no longer around and the chips (all DIP devices) have had their markings sandpapered off (grrr...).
I'm trying to identify the main controller device in a 64-pin Shrink DIP package where the only pins I can (so far) confirm are +5V on pin 43 and ground on pin 26.
When first checking the pinouts I thought I'd 'got it' when I identified data bus connections that matched up to the TMS9900 pinout but when I checked the datasheet the power pins were now where near what I've found....
I've tried the usual suspects (TMS9900, 68000 etc) but no results yet. It may even be a PIC-type device (??) but that's just me guessing....
Can anyone suggest types of device (in a 64-pin shrink DIP) that I could look up to see if I can find a match?
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