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. Em 06/09/2015 15:42, "Jay West" <jw...@classiccmp.org> escreveu:
> Several people asked, here's the scoop: > > The common proms for HP 21MX M/E/F are 1K, 4K, and 8K. > > 1K are used for either loader roms on the cpu board or microcode on the FAB > 4K are used for microcode on the FAB or FEM > 8K are used for microcode on the FEM > > The manuals you'll want to print and keep handy: > HP 12992 Loader Roms Installation Manual, 12992-90001 (April '86) > HP 1000 M/E/F-series Firmware Installation and Reference Manual, > 12791-90001 > (September, '83) > I believe these are both on bitsavers. They are "must have" manuals. > > These are all bipolar proms, and most modern prom programmers will not be > able to program them. I use a Data I/O 29B (with Unipak 2B), and it can > program all these parts. Those programmers appear on ebay from time to time > at around roughly $400. > > The blank proms are not terribly easy to find these days. Ebay has them > occasionally, but your best bet is sites that cater to arcade machine > repair. > > Here's a non-exhaustive but useful list of compatible parts for each: > > 1K parts > MMI 6301 > Harris 7611 > Signetics N82S129 > National 74S287 > TI 24S10 > AMD 27S21 > Fujitsu 7114 (possibly 7052 as well, need to verify that) > > 4K parts > Signetics N82S141 > Harris 7641 > MMI 6341 > > 8K parts > Signetics N82S181 > Harris 7681 > MMI 6381 > > >
