22 Nov
2016
22 Nov
'16
12:04 a.m.
From: Josh Dersch
I'm finally turning my attention back to my 11/40
(which I started
working on 7 years ago and never quite got around to finishing -- I've
learned a lot since then and I'm hoping to be able to debug it properly
now).
A KM11 might help, if you have one: there are a couple of sources for new ones
(I got mine from Guy), it will allow you to single-step the microcode, etc,
etc.
My ultimate goal is to run V6 or V7 UNIX on it -- I
have the MMU but
I'm looking for an M787 (line-time clock) and M7237 (stack limit
register) to complete the set.
You don't need the SLR to run Unix V6 (in fact, IIRC, it doesn't use it). For
the clock, you don't absolutely have to have a KW11-L, you can substitute a
KW11-P - but V6 _has_ to have one or the other, or it panic()'s - some things
in the kernel have to have a working clock.
You will also need the KE11-E (M7238), as the Unix C compiler emits MUL, DIV
etc, and even the bootstrap uses them. The KE11-F (M7239) is useless; the V6
Unix C compiler doesn't generate that type of PDP-11 floating point.
Noel