Self modifying code, lambda calculus - Re: ENIAC programming

Johnny Billquist bqt at
Fri Sep 18 16:43:25 CDT 2015

On 2015-09-18 18:21, Eric Smith wrote:
> On Fri, Sep 18, 2015 at 7:45 AM, tony duell <ard at> wrote:
>> The 11/780 has a PDP11 to load the microcode (I think) but the 11/730 makes do with an
>> 8085. After booting I think that handles the console port still.
> Most of the 11/780 microcode is in bipolar PROM. There's a small patch
> area which is loaded by the PDP-11.
> The 11/785 microcode is entirely in RAM, so it all gets loaded by the PDP-11.

That sounds strange, as the 11/780 and 11/785 are nearly identical 
machines. But I have been wrong before. :-)


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