Extra chips in PDP11/23 plus cpu board

Nigel Williams nw at retrocomputingtasmania.com
Wed Dec 20 00:16:18 CST 2017

On Wed, Dec 20, 2017 at 4:45 PM, Douglas Taylor via cctalk
<cctalk at classiccmp.org> wrote:
> There is a CPU board for sale on ebay, M8189, and it has the usual 3 chips
> CPU, MMU, FPU.  However, there are 2 extra chips and I've never seen that
> before.


Microcode ROMs for the CIS (Commercial Instruction Set)

More information about the cctalk mailing list