[vcf-midatlantic] Good source for eproms?

Jonathan Gevaryahu jgevaryahu at gmail.com
Thu May 26 13:56:29 EDT 2016

On 5/26/2016 1:41 PM, David Riley via vcf-midatlantic wrote:
>> On May 26, 2016, at 00:48, Dave McGuire via vcf-midatlantic <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
>>   Yup, "OTP" EPROMs.
> I think that's just called a "PROM". :-)
> - Dave

No, from what I understand of the usual usage of terms, PROMS are the 
bipolar/fusible link parts like 82s137, MMI6301, etc. These can be open 
collector or tri-state.

OTPROMs aka OTP EPROMs are floating gate 2764/27128/etc EPROMs with no 
window, so they can't be erased with UV light (though, as we can see 
here, age can still cause them to become slowly erased).

Mask ROMs are the 2364/23128/etc parts which are mask programmed at the 
chip fab, and never lose their contents unless they lose their smoke.

Jonathan Gevaryahu
jgevaryahu at gmail.com
jgevaryahu at hotmail.com

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