29 Nov
2021
29 Nov
'21
5:32 a.m.
Dear list, I'm currently restoring a PDP-11/70 system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
29 Nov
29 Nov
11:54 a.m.
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70
system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
I have M8127, M8128, M8129 (in my basement for > 20 years, condition
otherwise unknown). I don't *think* I have an FP11-C in any machine,
but I will need to check.
Contact me off list for further discussion.
JRJ
11:55 a.m.
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70
system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
I presume you'd also need M8126, or is that one there already?
JRJ
12:05 p.m.
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70
system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
So, it turns out that I *do* have an FP11-C. My PDP-11/45 with the
KB11-D processor in it has an FP11-C. So, at the least, I would need to
try and figure out if the boards in it right now are the ones that came
with it [This is what my notes from 1989/1990 say], or are my spares,
and, at the least one of the two M8126 boards is marked "Bad".
JRJ
12:18 p.m.
Van: Jay Jaeger via cctalk<mailto:cctalk at classiccmp.org>
Verzonden: maandag 29 november 2021 21:05
Aan: cctalk at classiccmp.org<mailto:cctalk at classiccmp.org>
Onderwerp: Re: PDP-11/70 Boards
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70
system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
So, it turns out that I *do* have an FP11-C. My PDP-11/45 with the
KB11-D processor in it has an FP11-C. So, at the least, I would need to
try and figure out if the boards in it right now are the ones that came
with it [This is what my notes from 1989/1990 say], or are my spares,
and, at the least one of the two M8126 boards is marked "Bad".
JRJ
I think the FP11 boards are not essential for the 11/70
They only add hardware FP support.
However, I think that the cache boards are essential.
Not sure the 11/70 will work without them.
Henk, PA8PDP
1:06 p.m.
On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via cctalk
<cctalk at classiccmp.org> wrote:
I think the FP11 boards are not essential for the
11/70
They only add hardware FP support.
Not essential for many uses, but I'm pretty sure UNIX is unhappy
without them. If you are going to run RSTS/E or RT-11, should be just
fine either way.
However, I think that the cache boards are essential.
Not sure the 11/70 will work without them.
Agreed. I think those _are_ mandatory.
Cheers,
-ethan
1:12 p.m.
On Mon, Nov 29, 2021 at 1:06 PM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
Yes, the cache is an integral part of the memory system on the 11/70.
- Josh
On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via
cctalk
<cctalk at classiccmp.org> wrote:
Depends on the UNIX. Ultrix works fine, and the latest patchlevel of
2.11BSD has floating point simulation that works fine.
(I'm running my 11/70 sans floating point hardware at the moment, I'd still
like to find a boardset one of these days, though. Floating point
emulation is slow!)
I think the FP11 boards are not essential for the
11/70
They only add hardware FP support.
Not essential for many uses, but I'm pretty sure UNIX is unhappy
without them. If you are going to run RSTS/E or RT-11, should be just
fine either way.
However, I think that the cache boards are
essential.
Not sure the 11/70 will work without them.
Agreed. I think those _are_ mandatory.
Cheers,
-ethan
1:19 p.m.
On Nov 29, 2021, at 4:12 PM, Josh Dersch via cctalk
<cctalk at classiccmp.org> wrote:
On Mon, Nov 29, 2021 at 1:06 PM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
Another option would be a compiler that generates no-FP code. That's faster than
emulation. gcc can do that; does 2.x BSD cc have such an option?
paul
On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via
cctalk
<cctalk at classiccmp.org> wrote:
Depends on the UNIX. Ultrix works fine, and the latest patchlevel of
2.11BSD has floating point simulation that works fine.
(I'm running my 11/70 sans floating point hardware at the moment, I'd still
like to find a boardset one of these days, though. Floating point
emulation is slow!) I think the FP11 boards are not essential for the
11/70
They only add hardware FP support.
Not essential for many uses, but I'm pretty sure UNIX is unhappy
without them. If you are going to run RSTS/E or RT-11, should be just
fine either way.
1119
days inactive
1119
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7 comments
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participants (6)
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cube1＠charter.net -
derschjo＠gmail.com -
edcross＠gmail.com -
ethan.dicks＠gmail.com -
henk.gooijen＠hotmail.com -
paulkoning＠comcast.net