PDP 11/23 help needed

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Wed Apr 22 18:38:25 1998

On Apr 22, 19:12, Allison J Parent wrote:

> LSI-11/03 cpu and box. The backplane was wired for only 16bit addesses.
> Also that particular CPU put some of the microcode signals on what would
> have ben the A16-21 lines.

Nitpick: Actually, it's wired for 18-bit (it has to be, for parity), and the
extra microcode signals are only on the A18-21 lines.

You can have fun with General Robotics backplanes/PSUs. Some of these put 24V
AC on the lines normaly used for A20 and A21.

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York
Received on Wed Apr 22 1998 - 18:38:25 BST

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