7 Sep
2015
7 Sep
'15
8:34 a.m.
As I said in the original post I wrote, sometimes you gotta use flash
devices that are WAY faster than common EPROMs...
2015-09-07 12:32 GMT-03:00 John Robertson <jrr at flippers.com>:
On 09/06/2015 2:00 PM, Alexandre Souza wrote:
Jay, no one is pin compatible, I always make
adapters. But at least I make
it work :D
2015-09-06 16:00 GMT-03:00 Jay West <jwest at classiccmp.org>:
Alexander wrote...
> -----
> Intersting to note: many times i have used eproms in place of these
> proms.
> Usually, flash parts are faster, so better suited to the task.
> -----
>
> Loader roms:
> You may be able to get by with that on loader roms. I've never found
> eproms that were functional & pin compatible. What ones did you use for
> the
> 1K variety?
>
> Microcode:
> I doubt seriously the eproms would be stable for microcode. HP specs 5ns
> speed parts for the microcode; what eproms work and can hit those
> speeds? I
> suspect this is one of those "might seem to work" but is a really bad
> idea.
>
> J
>
>
>
> As Jay points out, it is the access speed required by the device you are
substituting the EPROM for a ROM/PROM that counts. In some cases the 100 to
400ns access speed of EPROMs won't matter (clock of under 1mHz for 400ns
2716s to around 4mHz for 100ns EPROMs), but if you are running 10mHz or
faster reads then I suspect you will have problems unless you find faster
devices than EPROMs for your substitute ROM/PROM...
John :-#)#
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