ISO: Motorola MDP-1000 info/software
Josh Dersch
derschjo at gmail.com
Wed Sep 30 12:40:22 CDT 2020
On Wed, Sep 30, 2020 at 5:20 AM ED SHARPE via cctalk <cctalk at classiccmp.org>
wrote:
> whats the story on this...i see items but no pix. also check
> your spelling on Motorola; Instrmentation and Control, Inc. that is in
> the index. let me now if there is a photo group for this at least
> with the covers I always wondered if it was just a 12 bit computer
> or if it was software compatible with pdp-8? I wonder what else
> this division of Motorola produced.... there was a teleprinter they
> made... Here is the link to the teleprinter it is filed under gov
> div. http://www.smecc.org/motolola_government.htmi think i got the 12
> bit computer manual from same person.
The link is dead (seems misspelled, but even correcting it (and changing
htmi to html) doesn't result in a link that works). I can't find any
reference to you posting a link to the manual in the cctalk archives, but
that doesn't mean it isn't there, somewhere. If you're able to scan this
manual, I'd love a copy.
The MDP-1000 is in no way like a PDP-8. Different memory word-size, has an
actual ALU, 5 registers, etc. It's a very odd little system. I was doing
a bit more reading last night and while the ALU is 12 bits wide, the Link
(carry) bit is the carry out from bit 7. Logical operations only operate
on the low 8 bits, though there are variants that work on the upper 4 bits
only, as well.
- Josh
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