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
22 Nov
22 Nov
12:30 a.m.
On Mon, Nov 21, 2016 at 4:04 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
I do have a set (got it from Guy years ago, for the express purpose of
debugging the 11/40) and I successfully used it to debug my 11/05.
The 11/40 is mostly working; I have a bootstrap terminator in it and it
runs the diag/console PROM without problems and stuff I toggle in seems to
work, but I've been unable to boot anything (like XXDP, for example).
There is some random behavior and there are some oddities about it-- Slot 9
of the CPU backplane is supposed to be an SPC slot but it doesn't seem to
work, and years ago I found a missing wire in the backplane. So things are
in a very random state and I need to spend some time sorting things out.
Thanks, that's good to know -- I assumed I needed the KJ11-A because the
KT11-D manual specifies (bottom of page 2-1): "When the KT11-D Memory
Management Option is added to an existing PDP-11 system, the KJ11-A Stack
Limit Register Option must also be added." So I assumed the MMU required
this option be present...
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.
Yeah, that might be harder to find, I'd forgotten about that requirement.
I suppose I could run Ultrix-11 instead (I have that on my 11/34 at the
moment) as it'll run sans floating point hardware, though it's a tight
squeeze...
- Josh
Noel
2959
days inactive
2959
days old
1 comments
2 participants
participants (2)
-
derschjo＠gmail.com -
jnc＠mercury.lcs.mit.edu