PDP-11/03, LSI-11 KEV11-C CIS option

[Paul Anderson]

I know one person who has one.  I think I had a few at one time, but it's
been years since I've seen them.

On Sat, Jan 30, 2016 at 2:29 PM, Eric Smith <spacewar at gmail.com> wrote:

> Does anyone have a PDP-11/03 or LSI-11 with the KEV11-C CIS
> (Commercial Instruction Set) option? It may have also been known as
> DIS (Dibol Instruction Set).  It apparently consists of two microcode
> ROM chips (MICROMs), 23-004B5 and 23-005B5.
>
> Last month I posted here about building a circuit to dump the contents
> of MICROMs:
>     https://www.flickr.com/photos/22368471@N04/albums/72157662054690240
> I've dumped the base LSI-11 instruction set chips and the EIS/FIS
> chip.  I've partially disassembled the former:
>     https://github.com/brouhaha/lsi11uc
> and verified that the latter matches the EIS/FIS microcode source code
> provided with the KUV11 writable control store support software. I'd
> like to dump the CIS microcode ROMs as well. The resulting dump would
> be usable by anyone with a KUV11. I'm contemplating developing a
> MICROM replacement board, which would be useful for those without a
> KUV11.
>
> I've made more progress with the WD9000 Pascal Microengine microcode
> than the LSI-11 microcode because someone provided a photomicrograph
> of the CP2161 control chip and I was able to dump the PLAs. I should
> be getting a photomicrograph of the CP1621 control chip of the LSI-11
> soon, and will be able to do the same for it.
>