PDP-11/05 (was: PDP-11/05 microcode dump?)
tom at figureeightbrewing.com
Tue Jun 15 10:47:38 CDT 2021
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 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.
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 :)
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