Prom Burner & EEPROM's

[Bob Valentine]

There was a discussion of this a while ago, here's what I saved for my files:

256k EEprom subsitute:

"No, 28C256 [a EEprom - rv] cannot be used in place of 27C256.  If I
remember correctly, A14 and /WE need to be switched around before it can be
used.  I was also told 28C256 program VERY slowly."

"The magic chip is the Atmel 29C256.  Its pinout matches [a 27C256 chip -
rv], and it is Flash so fast to program.  5V programming and supports sector
writing/erasing.  They are $3.96/each at JDR Microdevices. "

Sorry I can't attribute original author, but thanks whoever it was....

-> Bob Valentine
-> bob at tecmark.com

At 08:58 PM 9/4/2000 -0700, you wrote:
>Hmmm....this sparks another question.  Is there such a thing as a drop-in
>EEPROM that could be used in place of either EPROM listed below?  If so, any
>idea as to a specific part number and manufacturer? Thanks.
>
>Walt.
>
>
>
>
>
>> Dan Townsend wrote:
>> >
>> > Now what chips do I need to get for the 87-89
>>
>> 27128 or 27C128
>>
>> > and 90-92 F-bodies
>>
>> 27256 or 27C256
>>
>> > and what speed?
>>
>> Probably just about any speed grade you can get these days in those
>> sizes.  250 ns should be good enough.
>>
>> If you get just 27256's, you can use them in place of 27128's by loading
>> the bit image into the "upper half" of the chip.
>>
>
>
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