WANTED: iSBC-202 microcode image

Jay Jaeger cube1 at charter.net
Thu Nov 14 08:17:33 CST 2019

The iSBC 202 is actually two boards:  a controller, PSA 1000467 and a
interface board PWA 1001036.

There are 4 PROMS on the controller/channel board, intel D3604 (512x8),
labelled A10: 52-722, A11: 52-729, A12: 52-741 and A13: 52-735 .  I
presume these are what you are looking for.

Unfortunately, my MiniPro knows D3604 not, so I'd presumably have to
engage my Arduino Mega or some such to read them, unless the pinout
matches something that the minipro does know about.

I do not have CROMIS.

If nobody else has them, and after other advice you decide you want to
pursue this, I could put it on my list of things to do over the next
month or so.


On 11/13/2019 2:45 AM, F.Ulivi via cctalk wrote:
> Hi everyone,
> I'm planning to expand my MAME-based emulation of Intel MDS-II systems
> with the support for double-density floppy disks. In particular, I'm
> thinking of emulating the isbc202 floppy controller because its
> architecture looks very interesting. This board was based on Intel's own
> 3000-series bit-slices.
> A necessary step for this work is finding the image of the 4
> microprogram PROMs on the controller board. Has anyone on this list ever
> dumped these memories, please? Can you share the binary images with me?
> Of course, I'm going to properly credit you in the emulator sources.
> AFAIK this would be the first emulation of a Intel 3000 system.
> A side question: do you happen to know if the Intel CROMIS assembler for
> 3000 series has ever been preserved somewhere on the Net? The manual
> says it was provided to user as a set of FORTRAN IV sources.
> Thanks in advance for your help.
> --F.Ulivi

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