On Tue, Jun 15, 2021 at 6:34 AM Tom Uban via cctalk <[email protected]> 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
