> From: Jon Elson
> As soon as somebody figured out that you could combine the sense and
> inhibit wires, everybody immediately went to 3-wire planes.
I"m suprised the idea wasn't patented. Or maybe it was, and they made the
license widely available at modest terms?
Noel
Well, I was finally able to get a PMI memory board to expand my
11/93 to the full 4 Meg. (Thanks Paul!)
I thought it would be as simple as configuring what bank I wanted
it to fill and inserting it (in front of the CPU). Sadly, that
didn't work. First problem is the only document i could find is
not for the actual version of the board I have. It has the same
switch sets so I tried it anyway. Set it to be in the upper 2Meg
and gave it the next CSR after the on board memory. No luck.
11/93 still reports 1024KWords and the Map command shows neither
the additional memory or the second memory CSR.
Anybody have any experience with this? Is there a switch I have to
change on the CPU module to make it recognize the additional external
memory? IS there something about PMI that I am missing?
Any advice gratefully appreciated.
bill
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Sellam
Does anyone know what the current status of this might be? I am
fairly certain Mentec didn't get this and I am not sure anyone
did. Did it merely die when everyone thought Mumps was on the
down hill slide? Was it ever really a DEC product or was it
something DEC picked up along the way after Mass General let it
out of its cage?
bill
> From: Allison
> Experience is that an 11/23 or 23+ will run V6 as mine does.
What changes did you make to get it to run? (I assume the stock binary
wouldn't run.)
Noel
> From: W2HX
> i have a few CPUs available to me, a 11/23+, an 11/73 and I also have
> available to me an 11/83
> I would like to try to run as many different OS's as may interest me,
> including some unixes as possible (bsd...etc).
Early Unixes in general will run on those machines - but not straight off the
tape (since they didn't exist then, and have quirks which aren't supported).
I've brought up V6 on a /23 (which must have the KTF11-A MMU chip); here:
http://gunkies.org/wiki/Running_UNIX_V6_on_an_-11/23
are instructions on exactly what (minor) changes need to be made for it to
run.
The /73 and /83 should be subsets of that, although you'll want to start with
m45.s, because those machines support the split-I-D MMU of the -11/45. (A /23
Unix binary would boot/run on them, if you don't feel like doing a special one
for them.) I haven't yet tried V6 on them; if you want me to, and do a
writeup, let me know. The /73 and /83 have LTC registers, so on those you
won't need the LTC hack.
Also, you may know this already, but if not, note that the /83 is a PMI:
http://gunkies.org/wiki/Private_Memory_Interconnect
machine, and _MUST_ be plugged into a Q/CD backplane _only_; plugging into
a standard Q/Q backplane will _damage_ it.
> would I see any improvement in performance with the FPU compared to
> without it? Or does the application running need to be something like
> fortran to see any perceivable difference?
As someone noted, the /73 and /83 implement thefloating point instructions in
microcode, so the code can't tell if the optional FPJ11 FP hardware
accelerator is plugged in or not. In general, only on applications (the
language is not relevant) which are heavy users of FP would you see any
difference.
On the /23, with no KEF11-A FPU chip plugged in, there are no floating point
instructions at all, so any application which tries to use them will blow out
(although under V6 there's an emulator); see here:
http://gunkies.org/wiki/Setting_up_UNIX_-_Sixth_Edition
and search for 'floating point' to see discussion of it).
> From: Ethan Dicks
> v5, v6, and v7 UNIX shouldn't require any sort of math hardware.
Don't know v5/v7 in detail, but AFAIK that's accurate. V6 can _support_
FP hardware on machines which have it, and is otherwised prepared to
emulate those instructions (see above).
> From: Paul Koning
> I think that was typically called "EAE" (extended arithmetic element),
> a Unibus peripheral that implemented integer mul/div ... It only
> applies to 11/20 and 11/05 since all the other machines have the
> relevant instructions built into the CPU.
Also the -11/04 and -11/03 were both missing the EIS; the former could use
the EAE, for the latter the optional KEV11-A or KEV11-B microcode chips both
provide it.
> From: Josh Dersch
> The EAE was also an option on the 11/40.
Technically, on any UNIBUS machine; on the /40, the EIS (added instructions,
not the device model of the EAE) was available via an optional board in
the CPU.
Noel
On Thu, 4/18/19, dwight via cctalk <cctalk at classiccmp.org> wrote:
> My understanding was that the mercury delay lines
> needed periodic repairs ( not sure what the cause
> was but mercury does dissolve into many metals ).
> If I were going to make a delay line memory, I'd go with
> the magnetostrictive. These are practical to make. One just
> needs a little ingenuity and a spool of piano wire.
> Dwight
Or still do a fluid one, but take Turing's suggestion
and use gin as the medium.
BLS
?Hi friends. I am putting together a PDP-11 set up. i have a few CPUs available to me, a 11/23+, an 11/73 and I also have available to me an 11/83, M8190-AE .
I would like to try to run as many different OS's as may interest me, including some unixes as possible (bsd...etc). My question is, are there any OSes that need the floating point option?
Another question is, would I see any improvement in performance with the FPU compared to without it? Or does the application running need to be something like fortran to see any perceivable difference?
Thanks
