18 Sep
2015
18 Sep
'15
2:43 p.m.
On 2015-09-18 18:21, Eric Smith wrote:
On Fri, Sep 18, 2015 at 7:45 AM, tony duell <ard at
p850ug1.demon.co.uk> wrote:
That sounds strange, as the 11/780 and 11/785 are nearly identical
machines. But I have been wrong before. :-)
Johnny
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.