19 Dec
2017
19 Dec
'17
10:16 p.m.
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.
https://en.wikipedia.org/wiki/PDP-11_architecture#Optional_instruction_sets
Microcode ROMs for the CIS (Commercial Instruction Set)