15 Jun
2021
15 Jun
'21
7:15 a.m.
While we are on the subject of pdp11/05's I am in the need of repair
services for my M7261 KD11-B CPU board 1
(CONTROL LOGIC & MICROPROGRAMMED MODULE.)
Bill
On Tue, Jun 15, 2021, 9:59 AM Tony Duell via cctalk <cctalk at classiccmp.org>
wrote:
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.
-tony