No such thing as "the PDP" [was RE: Typesafety versus Worse is Better - was Re: Fwd: is there any word processing software for the pdp11?]

Eric Smith spacewar at
Thu Dec 4 18:25:58 CST 2014

On Thu, Dec 4, 2014 at 5:17 PM, Al  Kossow <aek at> wrote:
> On 12/4/14 1:34 PM, Dale H. Cook wrote:
>> does anyone know if there are any plans by the CHM to try to make the MIT
>> engineering prototype operable? I last saw it in use at MIT about 45 years
>> ago, when it was housed adjacent to the TX-0
> No, because we don't have it.
> That machine was heavily modified, adding timesharing and converting it to
> 2's compliment arithmetic
> to the point where was known as the PDP-1-X

CHM does have *a* PDP-1 prototype, though, which used to be in
"Visible Storage", and that's the one that I opined would never be

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