22 Nov
2017
22 Nov
'17
1:11 p.m.
On 11/20/2017 8:41 AM, Tapley, Mark via cctalk wrote:
On Nov 19, 2017, at 11:54 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
I think they also had the chip that did the pdp8 instruction set too.
That also brings up the other point, what software did they have?
Ben.
I can see it now, a pdp 8 time sharing emulating a 6502 emulating a 8080. :)
So we agree on parallel standard buses, that STD
bus is a strong
contender with varied processor base.
Catching up late, sorry if this is an old question, but what did the Digital Group
computers use? My recollection is that they offered cards with 6800, 6502, 8080, and Z-80
CPUs on the same bus, and that part of the system seemed to work reasonably well. (At
least, the Digital Group system complaints I read seem to center on the PhiDeck mass
storage system not the CPU/memorylperihperal bus.)
There is a nice website at: http://www.bytecollector.com/dg_cards.htm which seems to
show cards with not a whole lot of pins to connect to the bus - maybe 36 pins on the
visible side, though the card is definitely 2-sided so probably 36 more on the back side?