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