21MX proms (per request)
alexandre.tabajara at gmail.com
Sun Sep 6 13:47:03 CDT 2015
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" <jwest at 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,
> (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
> 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
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