Re: 74S288 Prom compatibility question

Not sure, will check. Would certainly think a DataIO 29 would. Also,
if buying blank parts from a vendor like DigiKey or Newark they might
program them for you (would have to ask).

I'll check.

One other difference between PROMs and EPROMs are that EPROMs are
programmed a byte at a time while PROMs are programmed bit by bit. Most
PROMs are programmed by melting fuses. Newer parts may program like
EPROMs, but the old ones are fuses.

js@cimmeri.com wrote:
>
> Thanks for your reply, Rodger. What you're saying, however
> unfortunate, makes sense. So they're like PALs rather than like EPROMS.
>
> Are you aware of any burner that handles the TI proms?
>
> jS
>
> Rodger Boots wrote:
>> Unlike EPROMs, PROMs program differently from manufacturer to
>> manufacturer. From some manufacturers a blank part will be all zeros
>> and bits are programmed to ones. Other manufacturers will be the
>> opposite. And some Cypress parts will come up in random states when
>> blank and are forced to either ones or zeros as needed. Add to that
>> different timing and different voltages for programming and you have
>> a real mess.
>>
>> Typically, just about everyone can handle National parts, support for
>> other brands vary.
>>
>> js@cimmeri.com wrote:
>>>
>>> Hi folks. Trying to create a backup copy of a game board's National
>>> Semi DM74S288N 32x8 bit prom into what I believe is the equivalent
>>> chip, a TI SN74S88N. Yet, my Data I/O 2900 and Optima burners --
>>> both of which only list the Nat Semi chip -- can't seem to program
>>> the TI prom. They can read it, blank checks ok, but errs on burn --
>>> all bits remain zeros.
>>>
>>> Anyone run into this problem before? Are the NS and TI chips not
>>> identical?
>>>
>>> Thanks for any advice.
>>>
>>> John Singleton
>>> Rockville, MD
>>>
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Received on Tue Jan 26 11:59:54 2010