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