I have an interesting question. Can this board be used as additional ram
in a PDP-11? If so, how might it be done?
I have a Qbus Memory board that must be from a uVAX II - M7609-AP
with 288 (I hope I counted correctly) memory chips
4256L-15 8726255
A 21-22422-42 R
with the standard male 50 pin header at the top to be connected to a uVAX
CPU.
If my arithmetic is normal, does this make it an 8 MByte memory?
Now, I am no hardware expect, in fact about all I can do with a soldering
iron is to plug it in and unplug it - before it gets too hot and I burn something.
But, is there any way that a regular PDP-11/73 could see this memory
and use it in some manner?
Otherwise...
I don't expect that anyone will want it, but if so, can I swap it for a regular
PDP-11 Qbus memory of 4 MBytes?
Sincerely yours,
Jerome Fine
How many people on this board are in the military? I already know that Jeff
Helliage is a (no offense!) "Box Kicker" Second Class, but are there any
others?
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Home page: http://www.geocities.com/netsurfer_x1/
Computer Collection:
"Triumph": Commodore 64C, 1802, 1541, FSD-1, GeoRAM 512, MPS-801.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A, TI Speech Synthesizer.
"Monolith": Apple Macintosh Portable.
"Spectrum": Tandy Color Computer 3, Disto 512K RAM board.
"Boombox": Sharp PC-7000.
"Butterfly": Tandy Model 200, PDD, CCR-82
____________________________________________________________
_________________________________________________________________
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>I have an interesting question. Can this board be used as additional
ram
>in a PDP-11? If so, how might it be done?
>
>I have a Qbus Memory board that must be from a uVAX II - M7609-AP
>with 288 (I hope I counted correctly) memory chips
>4256L-15 8726255 A 21-22422-42 R with the
>a standard male 50 pin header at the top to be connected to a uVAX
>CPU.
>If my arithmetic is normal, does this make it an 8 MByte memory?
It's a microvax memory most likely. PDP-11 can address a maximum of
4mb.
>But, is there any way that a regular PDP-11/73 could see this memory
>and use it in some manner?
No, it's not compatable.
>I don't expect that anyone will want it, but if so, can I swap it for a
regular
>PDP-11 Qbus memory of 4 MBytes?
That should be possible but I think the largest common memory board
for PDP-11 Q-bus is 1MB.
Allison
On February 2, Jerome Fine wrote:
> I have an interesting question. Can this board be used as additional ram
> in a PDP-11? If so, how might it be done?
>
> I have a Qbus Memory board that must be from a uVAX II - M7609-AP
> with 288 (I hope I counted correctly) memory chips
> 4256L-15 8726255
> A 21-22422-42 R
> with the standard male 50 pin header at the top to be connected to a uVAX
> CPU.
>
> If my arithmetic is normal, does this make it an 8 MByte memory?
It's an 8mb board, yes. And no, it won't work on a pdp11...the PMI
(Private Memory Interconnect) connector at the top of the board is how
it talks to the MicroVAX-II CPU, while [most] qbus pdp11 systems talk
to their memory via Qbus.
> I don't expect that anyone will want it, but if so, can I swap it for a regular
> PDP-11 Qbus memory of 4 MBytes?
I doubt you'll have much luck with this idea...MicroVAX-II memory
boards are all over the place, while 4mb Qbus pdp11 memory bards are
getting hard to find.
Sorry if I busted your bubble...
-Dave McGuire
In a message dated 2/2/01 8:40:26 PM Eastern Standard Time,
THETechnoid(a)home.com writes:
<< Please FTP to 24.15.74.214 and try again with our thanks and my personal
assurance that this problem is not likely to recur.
>>
i presume there's a classic computer involved somewhere to make this on
topic? heh
> Hi folks, (2nd go - this time I won't press whatever I pressed last time
> :)
>
> The following is a message from Julian Richardson
> (JRichardson(a)softwright.co.uk) - he'd post it himself but for some reason
> the list is bouncing his messages......any replies to him please.
>
> <cough>
> <clears throat>
>
> -------------------------------------
subject: Any classic telecoms fanatics on the list?
Not quite computing, but it hits the ten-year mark. Just think of it as a
big tape drive ;)
I've got an old reel-to-reel answering machine made by Ansafone which I'm
trying to locate more information on (web searches turn up nothing useful
and there don't seem to be any "classic" telecoms groups which I can find -
if someone knows of one, let me know)
I did come across a uk.telecom newsgroup which turned up one person who'd
heard of the machine - he was quite helpful with connector info. Apparently
the phone socket on the back of the machine (a big 6-pin round socket) is
known as a "96a" type jack. It's the pin-outs for this which I'm really
after...
(plan is to try to hook this thing up to the phone network if I can; the
phone system hasn't changed much - outwardly anyway - in years so hopefully
it's still possible, providing our exchange still supports pulse as well as
tone dialling)
cheers,
Jules
------------------------
> --
> Adrian Graham MCSE/ASE/MCP
> C CAT Limited
> Gubbins: http://www.ccat.co.uk (work)
> <http://www.snakebiteandblack.co.uk> (home)
> <http://www.binarydinosaurs.co.uk> (The Online Computer Museum)
"Ready" - a MTX500, yesterday.
On February 1, Sellam Ismail wrote:
> Holy crap. Why is an aerospace company still using such an old-assed
> computer? Anyway, I may be able to help them.
...after all, everybody knows "old" means "incapable of performing
useful work"!
*poke poke*
-Dave McGuire
> > Everything else that's available is an UPDATE, and CAN NOT
> > be used for a fresh install. You can't, for example, install
> > System 7.5.3 on a Macintosh UNLESS it already has 7.5 or 7.5.1.
>
> Not true, you can use it for 7.1 systems, *or* download the Network Access
> disk to bring up a system with *no* System Folder on the HD, and then
> start the installation.
Since 7.1 was also a commercial release, that's not a surprise, but
in that scenario, we're back to having to start with a purchased
product and then upgrade it.
But I confess I know nothing about this Network Access disk,
and find it strange that Apple would let that one slip out
the door...
Or is this Network Access disk a third-party thing?
=dq
> On Fri, 2 Feb 2001, Douglas Quebbeman wrote:
>
> > I think you're missing my point.
> >
> > System 7.5 was a retail-boxed version of MacOS, as was
> > System 7.1, and NEITHER of them are available for free
> > download.
>
> Two years ago, you would've been correct. Apple has released 7.5, for free
> download, to their ftp site. This is the same FTP site that has all their
> updates.
Well, well, well... the first thing that his Steveness has done that
I can agree with. That's what I get for losing interest two years ago...
-dq
