PDP-11/23 PLUS commercial instruction set (CIS)

From: Megan <mbg_at_world.std.com>
Date: Sat Aug 4 12:07:29 2001

>I have never heard of any other "microms" for the 11/23 or the 11/24, but
>that does not mean that there are none. However, none of the manuals I
>have on the 11/23 dual (M8186) or the 11/23 quad (M8189) modules have
>ever mentioned any. So I would say it is doubtful. If there are any, I
>suspect they would be a private development and that seems even more
>doubtful considering the expense.

I don't know if they are called Microms, but there is the CPU, MMU,
FPU, CIS and I seem to remember that there was one other...

As for their size, all of the chips except for the CIS option are
one socket wide. The CIS option actually plugs into the outer
sets of pins of adjacent sockets.

          socket1 socket2
          o o o o
          o o o o
          o o o o
             . .
             . .
             . .
          o o o o
          o o o o
          o o o o

          \-----/ \-----/
            CPU MMU

          socket4 socket5
          o o o o
          o o o o
          o o o o
             . .
             . .
             . .
          o o o o
          o o o o
          o o o o
          \-------------/
                CIS

and the CIS carrier actually has 6 chips.

As I mentioned in a prior post, I have an 11/23+ with CPU, MMU,
FPU and CIS, so I can prove it exists...

                                        Megan Gentry
                                        Former RT-11 Developer

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Received on Sat Aug 04 2001 - 12:07:29 BST

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