PDP-11/05 (was: PDP-11/05 microcode dump?)

Tony Duell ard.p850ug1 at gmail.com
Tue Jun 15 08:58:47 CDT 2021

On Tue, Jun 15, 2021 at 6:34 AM Tom Uban via cctalk
<cctalk at classiccmp.org> wrote:

> My KM11s are based on Tony Duell's schematic and if you look, switches S3
> and S4 are both driving outputs rather than simply switching them to ground,
> so I don't think two boards at one time would work if these signals are simply
> tied in parallel on slots A2 and B2.

I took the switch circuits from the offical KM11 schematics which are
either in the PDP11/45 CPU printset or the RK11-C printset that I
have, I forget which. I certainly didn't add logic or replace
open-collector parts with totem-pole ones.


More information about the cctalk mailing list