Which Dec Emulation is the MOST useful and Versatile?

Angelo Papenhoff aap at papnet.eu
Thu Nov 2 07:30:44 CDT 2017

On 29/10/17, Noel Chiappa via cctalk wrote:
> Another fun KA10 fact: it used 'hardware subroutines' - i.e. a clock pulse
> would get to a certain point, and get conditionally diverted through some
> other circuitry, later to come back and continue where it left off. Whee!

When I was taking a look at the CDC 1604 lately (btw, sadly two documents
are missing on bitsavers) I saw pretty much the same thing. Something
would set a flip-flop, go through the memory sequence, and continue from
the point it left off. This reminded me of the PDP-6 immediately (which
I'm very familiar with because of a logic-level emulator and verilog
implementation I've written [1]). The indexing and indirection mechanism
was also very similar. I suspect Gordon Bell was inspired by this
machine a bit. I think I'll mail him about the 6 again...


[1] https://github.com/aap/pdp6

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