At the top right under 2 red toggles, and LED's is
Model no. MPC-75
675001
issue a
serial no. 055
date 10 82
on the bottom right are AIR LAND SYSTEMS and 2 pins
labelled spkr terms.
The bottom is 2 groups of 22 pins
the first group has a break between pins 7-8 and the
second group between 13-14
A PROM1 is labelled NTRKBD .101-1-1.2683 in pencil
on the top left below a 25 pin connector with 2 missing in
the centre.
On the left edge is CCA 94V0 8-82
card is about 10" by 7"
the pins groups are 3.5" with a 1.25" gap
The CS/20 and CS/30 are microNOVA based machines, I can't speak for the
CS/30 but the CS/20 dates to 1978... I'm not at all surprised that he would
have bought it through Intel, during the late 70's and early 80's Intel was
making memory boards for DG machines and also for PDP-11's, both Qbus and
Unibus.
Will J
_________________________________________________________________
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>Actually you've got me thinking there. Considering that RAM is dirt
>cheap these days. I'm wondering what it would take to build a RL02 drive
>that is actually a RAM disk (of course you'd be able to fit several disks
>on one stick of RAM), and what kind of performance you'd get. Off course
>I'm not a hardware type, so I don't know how hard that would be.
Hmmm... don't the MS630/MS650 boards simply get power from the bus,
and memory transactions are over the PMI cable? If so, then what
about some sort of Qbus option which looks like a disk, but has a
connector on it so that it connects to the MS6xx board... ready-made
memory farm which could be used as a disk... (And don't some of the
boards come in 16mb and 32mb flavors?)
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
No, it won't show up on the bus. All transactions on that board occur
over the cable interconnect.
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
A friend of mine paid out $15 for a PS/2 8555, or model 55SX thinking it was
PCI interfaces (newby, doesn't know what microchannel is). Anyway I told him
that it was microchannel and NOT to put any PCI's in it, which he was smart
enough to heed. I looked the unit over and it has a Procom IDE hard drive
interface and is a complte main unit. Of course it doesn't have the monitor,
keyboard or mouse but is otherwise a complete main unit with hard drive,
floppy, token ring card and memory and (of course) has built-in serial,
parallel, video, mouse and keyboard ports. I believe it runs a 386SX-16
processor and has a coprocessor socket as well. It uses 72 pin SIMMs as
well, has 2mb in it now. Cosmetically it's in really good condition as well.
Now that he knows it isn't suitable for his needs he wants to get what he
has into it - the $15 (plus shipping of about 18-20 lbs). Anyone out there
want a 55SX that you can adapt more than the standard 55SX? I'll be cleaning
and testing it this weekend and if there are no firm repsonses by next
Friday I'll toss it on eBay to see what it gets. Email me direct at
rhblake(a)bigfoot.com if you have questions or wish to put a firm hold on it
for yourself. First come, first served.
>If I remember correctly, the Pentium came out around 1993, about four
>years after the 486 came out around 1989. If the engineering, design
and
>technical capability that led to the Pentium had been around in 1980,
the
>technical superiority that the PDP-11 enjoyed over the PC might have
>pushed DEC hard enough to upgrade the PDP-11 systems.
Ah, is that hit on the head healing or is the ethanol talking... DEC did
improve the PDP-11. Back in the 70s they created the VAX and just
when pentium getting remotely close there was Alpha.
>For commercial systems, operation at the high end can also be
>compared in favour of E11. With a fast Pentium III and E11,
>running PDP-11 software is less expensive and faster than with
>the fastest PDP-11 hardware.
E11 may be good and all but it runs on PCs and their record for
reliability
is not that of a native PDP-11... yet!
>But back to my original question and Zane's response plus the low
>price of memory. Might it be possible to design and produce a
>Qbus board which uses memory as the disk and have an interface
>like the HD: on E11 rather than MSCP? Considering that from
>the lack of a response on my original question in regard to the
>use of the 8 MByte of memory, it may be just as easy to start
>from scratch. By the way, on the "Full" commercial E11, the
>command is: "MOUNT HD0: RAM:/SIZE:bytes"
>and HD0: can be replaced by any of the emulated drives as well.
Nonrotataing didks for PDP-11s are really old news, seems EMC
and AMPEX were names I remember.
Allison
Hi all,
I got today an EPSON HX-40. it looks exactly like the HC-41 that I've been
wondering about.
It seems like the hc-41 is a OEM'd version of the HX-40 with a different
keyboard.
The HC-41 I have was used to control a CNC machine of some sort.
Pretty cool....
Francois
PS: I also scored a TRS80 100, a pair of COCO joystics a lisa mouse new in
the box and a bunch of magazines: popular electronics Nov 1975 with an
article about the Altair 680 and a bunch of Remark (one with the
introduction of the hero 2000)
Oh and a diagnostic cart for the COCO too.
> Isn't the max memory in a MicroVAX II 13 MB? Mine has 1 MB
>on the CPU board, an 8 MB board, and a 4 MB board and it is my
>understanding that this is maxed out.
No, 16mb If you use two 8mb boards it disables the onboard 1mb.
Allison
Al Gross, the Toronto-born man many call the "father of wireless
communication," has died at age 82.
"If you have a cordless telephone or a cellular telephone or a walkie
talkie or beeper," Gross once said, "you've got one of my patents." He
added that if his patents on those technologies hadn't run out in 1971,
"Bill Gates would have to stand aside for me."
http://canadacomputes.com/v3/story/1,1017,5603,00.html
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