On 6/15/21 8:58 AM, Tony Duell via cctalk 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 I did not mean to imply that you had changed the behavior in your KM11 design. You are surely a competent and trusted pdp11 resource :)
--tom