EPROM Question

[Jules Richardson]

Zane H. Healy wrote:
>> I've been trying to google up an answer, but have had no luck.  What is the
>> difference between a 27256 and a 27C256 EPROM?  Can a 27C256 EPROM be
>> substituted for a 27256?
>>
>> Zane
>>
> 
> It never fails...

:-)

On a related note, is there such a thing as a homebrewed cross-reference 
showing which EPROMS can be treated as the 'same' from a programming point of 
view?

For instance, my programmer knows nothing of Mitsubishi EPROMs, but does 
acknowledge many other manufacturers. I had no luck earlier trying to program 
a Mitsubishi 27218 part as an AMD EPROM of equivalent size, but it worked fine 
by telling the programmer that it was an Intel 27128 - presumably the timings 
vary slightly between manufacturers, but it's often possible to find something 
that's "close enough".

(If anyone else has an old Elan universe-series EPROM / PAL programmer, shout. 
I'd be interested to know if you have programming cartridges that are 
different to mine)

cheers

Jules