>Excuse me for the dumb question, but .... this is one term I have not
>been able to figure out exactly by the context. My best guess is
>"circuit diagram" - am I close?
Pretty much... but they also include such things as the mechanical
engineering prints and parts lists...
>I'm blushing, but determined to find out just what exactly printsets are!
There are no dumb questions... only dumb answers...
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 |
+--------------------------------+-------------------------------------+
I apologize, but in a spark of confusion and anger, I threw the bag full
of macintosh stuff into a river. So much for that...
--Max Eskin (max82(a)surfree.com)
On Mar 11, 7:56, Rick Bensene wrote:
> Subject: Old IC RAM Identification?
> Anyone out there that can identify (i.e. size & arrangement(IE: 1Kx1)
> and technology (i.e. Dynamic vs Static)) of some old RAM IC's?
>
> The parts are made by National, circa 1973. Part numbers are:
>
> MM4260 and MM5260
I've never seen any and those numbers aren't in my copy of Towers, but the
nearest are
MM4250, DIL 16, 256 x 1 SRAM, 650ns, 8 addr lines, 1 CS line, PMOS, +5V,
-9V, 37mA, TTL output levels.
There's an MM4261 listed, it's a 1024 x 1 DRAM with two more address lines
and two more CS lines in an 18-pin DIL package, and an 4262 is 2048 x 1, so
I'd guess your MM4260 is similar to a 4250 (256 x1). Sorry, no pinout.
There's no 5250 or 5260 listed but there are MM5261 and MM5262. They look
very similar to the 42xx but slightly faster, and they use +5, +6.5, and
-12V.
> These are found on an old memory board that is organized in four groups
> of 5 chips, with 3 4260's and 2 5260's in each group of 5.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
<Hazeltine is/was located in Mass if I remember correctly. They made a lot
The terminals group was located in Huntington NY (and Greenlawn NY) both on
LI. Down the block military products were also done. The terminal stuff
went away in the early 80s.
Allison
Story revised by Paul Braun, based upon suggestions from Eric Schranz:
The time had come for Bill Gates to finally leave for that great software factory
in the sky. Upon arriving at the Pearly Gates (no relation, but he did try to buy
them once), he was faced with a choice. He could either go to Heaven or to
Hell.
God said, "I'm willing to let you visit both places briefly if it will help you make a
decision."
" Fine, but where should I go first?"
God said, "I'm going to leave that up to you."
Bill said, "Ok then, let's try Hell first." So Bill went to Hell. It was a beautiful
clean sandy beach with clear waters. There were thousands of beautiful women
running around playing in the water, laughing and frolicking about. The sun was
shining and the temperature was perfect. Bill was very pleased. "This is great!"
he told God. "If this is Hell, I really want to see Heaven!"
"Fine," said God and off they went.
Heaven was a high place in the clouds, with angels drifting about playing harps
and singing. It was nice but not as enticing as Hell. Bill thought for a quick
minute and rendered his decision. "Hmm, I think I prefer Hell." he told God.
"Fine", retorted God, "as you desire." So Bill Gates went to Hell.
Two weeks later, God decided to check up on the late billionaire to
see how he was doing in Hell. When God arrived in Hell, he found Bill
shackled to a wall, screaming amongst the hot flames in a dark cave.
He was being burned and tortured by demons.
"How's everything going, Bill?" God asked.
Bill responded, his voice full of anguish and disappointment, "This
is awful! This is not what I expected. What happened to that other
place with the beaches and the beautiful women playing in the water?"
God said to Bill, "That was just the pre-release demo."
"What do you mean?" cried Bill. "This place is nothing at all like that! I was
promised fun and frolicking and a trouble-free afterlife! This is excruciatingly
painful and miserable and I can't get anyone to tell me why!"
And God said, "Duh! You, of all people. What part of that don't you understand?
The version you saw is supposed to be bundled with HellNT, but that's been
delayed, pending a very large snowstorm."
Paul Braun
NerdWare -- The History of the PC and the Nerds who brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
Hi,
I just bought a strange looking machine at a Salvation Army store. It's
>from AES Data Inc., Montreal, Canada. Model # is 7100, which is on the
plate on the front. I haven't brought it home yet because it's too damn
heavy to carry.
The monitor is attached to the machine via a swivel neck. Two
full-height 5.25" disk drives are attached to the right hand side. The
drives are part of the unit, but they're made to look separate, especially
by their height which is much taller than the rest of the machine. (The
drives are stacked one on top of the other.)
The port on the back which is labeled "Printer", is a female connector
which has pins arranged in a grid pattern. The connector looks very, very
similar to the game controller connector on a Magnavox Odyssey.
There's another port on the back which is a male edge connector. I didn't
count the number of pins on it.
The keyboard uses a wide phone-jack style connector, and it has a
grounding wire which screws to the back of the machine.
Does anyone know if this is just a strange looking early MS-DOS machine,
or a CP/M beast, or if it's something entirely different?
I can't wait to get it home and open it up to see what's inside.
Providing I can figure out how to open it. :)
--
Doug Spence
ds_spenc(a)alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/
>There is some sort of accelerator board built in to his 1541 drive.
>Unfortunately, for it to work, it evidently needs a disk with something
>called (I think) Burst Nibbler on it.
>Seems to be associated with something called Dolphin DOS, possibly on the
>same disk.
As far as I remember (please correct me) Burst Nibbler is one of the
accelerator system for the C=64<->1541 connection.
I remember that there was a board with 2 EPROMS and a flat cable. This
board have to replace the original C=1541 chipset.The flat cable was
connecting with the C=64 (coming inside thru a cartridge in its port?)
The flat cable was providing the parallel connection that was able to
speed-up data transfer
Inside the cartridge (or inside the C=64 new EPROM chipset) there were many
utility like
the NIBBLER copier, useful for hacking.
Ciao!
Riccardo
Riccardo Romagnoli <chemif(a)mbox.queen.it>
>
> I have had zero success with superglue as well. Epoxy mostly loves me, so
I
> plan to 'stick' with it.
>
As a former model airplane builder, I have found that the effectiveness of
Superglue varies *tremendously* from brand to brand. There are also several
different types. Some of them are very thin like water. Seems like those
only stick to flesh. Others are more of a Gel and work just the way you'd
expect.
Before giving up, I'd try a couple of different ones. It sure beats waiting
for epoxy to cure. If helps, I'll see if I can find a source for the "Good"
stuff?
Steve Robertson <steverob(a)hotoffice.com>
Excuse me for the dumb question, but ....
this is one term I have not been able to figure out exactly by the context.
My best guess is "circuit diagram" - am I close?
For example, in one of today's posts:
>so I can archive
>not only my manuals, but my printsets as well.
I'm blushing, but determined to find out just what exactly printsets are!
Thanks
Phil
>Almost any Plextor CD-ROM drive will have a jumper that will enable it to
>be used on a host expecting 512k blocks.
>I understand that many newer Toshiba CD-ROMs will also work equally well
>with 512k or 2048k blocks. As far as I'm aware, of the older Toshiba
>CD-ROM drives only the 3201B (3401B? I forget) is modifiable.
I think you mean "512" and "2048" instead of "512k" and "2048k" :-).
(At least you aren't talking about your processor speed in milliHertz!)
>Real DEC RRD-42 drives turn up on eBay occasionally, but I understand they
>use a non-standard caddy so make sure you get one. I learned this from Tim
>Shoppa so I'm sure he can correct me if I'm wrong.
RRD40's take non-standard caddies. I'm not sure about RRD42's off the top
of my head.
They're also as slow as molasses. I'd estimate, in modern "X" speed terms,
that a RRD40 is about 0.1X (i.e. if you're lucky you get one sector off
every ten revolutions.)
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
