[TUHS] First Unix that could run on a PDP-11 with QBUS
dave at horsfall.org
Sun Jul 27 15:49:47 AEST 2014
On Sat, 26 Jul 2014, Noel Chiappa wrote:
> That may or may not be true; let me explain. The 11/23 is almost
> indistinguishable, in programming terms, from an 11/40. There is only
> one very minor difference (which UNIX would care about) that I know of -
> the 11/23 does not have a hardware switch register.
I recall that there were other differences as well, but only minor. In my
paper in AUUGN titled "Unix on the LSI-11/23" it will reveal all about
porting V6 to the thing.
I vaguely remember that the LTC had to be disabled during the boot
process, for example, with an external switch. Then again, I could be
thinking of some other weird box to which I'd ported V6. As far as I
know, it was the first such port in Australia (if there were others then I
never heard about them).
More information about the TUHS