On 09/07/2015 12:47 PM, Sean Caron wrote:
But I do think there's merit in Alexandre's general argument that one could
theoretically emulate the older bipolar PROMs with some mix of modern
components ... and the programmable device would be (a) more easily
obtainable than the old bipolar PROMs and (b) programmable with
inexpensive, contemporary USB device programmers which are definitely big
positives.
Most likely, one could use a parallel modern EPROM that is
as fast as the old bipolar PROM.
Of course, the pinout would be totally different, probably
in a larger size package with way more pins.
This one is 256K and 70 ns access time.
http://www.digikey.com/product-detail/en/AT28HC256-70JU/AT28HC256-70JU-ND/2050794
If you REALLY need it fast, Winbond has a 45 ns EPROM, but
not in stock at Digi-Key.
That's their W27C512-45Z
Jon
