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Has any one come up with a Flash or EEPROM version that will be replacement for the 27C801, 27C1001, 27C4002

Foster,

Great question! I have been wondering the same thing, but have not found replacements.

CH :95-

I did a check for compatible eeproms.  All I could find is the Atmel AT28C010 for the 27C1001 (same pinout, slower speed).  I don't know the speed of the parts you are working with, but if it is in a 10MHz system (from what little I have read of the IGT systems), then it would probably need to be 100ns or faster access time.  EEPROMs in general are slow and big.  The Atmel part looks to be 120ns, probably too slow.  It is also one of the largest sizes I could quickly find.  Theoretically, one could construct a small header board with two eeproms to match the size and pinout of the larger eprom it sounds like are on the system.  I worked with eeproms long ago and am a bit rusty.  I think there was a version which had a built in tiny ram that could cache up the data in advance to make it appear like a faster part.  I don't know about flash parts, but I will take a look anyways.

Cheers,
-Greg

quick update.  There is a flash part similar to the 27c1001 and fast enough (the Atmel AT29C010A).  It looks like larger sized flash parts switch to the more space efficient "surface mount" style packaging.  I have not worked with flash before, so I can't say that this is a drop in replacement.  However the pinout is the same and the timing looks to be adequate.  Maybe when I get my own processor board to play with I will have some more suggestions.

Cheers,
-Greg