Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs
21 Mar
2000
21 Mar
'00
9:41 p.m.
On Mar 21, 23:05, Allison J Parent wrote:
<I don't really see how the fanout units on offer (or my unsuccessful
<back-to-back device) could do that -- the termination isn't in the
<transceiver or fanout unit, it's a resistor on the end of the cable.
< Anyway, it would still only be one termination domain. Or maybe I've
<misunderstood what you mean? If you mean my back-to-back transceiver
idea
<yes, if it had worked, you could use it to split a
termination domain
into
<two, just like a two-port repeater, or a very
simple bridge (except a
<bridge usually separates collision domains too).
Anyone ever heard of a DELNI? Ok, it was an 8 port AUI to AUI with a 9th
for AUI to h4000 fat eithernet cable. Popular use was for cobbing 4-7
system together locally if you didn't have the BIG backbone. Logial
equivilent of a 8 port hub used for 10bt.
Yes, never knowingly used one, but I've seen them. 3Com made an 8-port(?
or 6?) AUI repeater -- one of my friends used one as his hub for a while, I
believe.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
21 Mar
21 Mar
10:31 p.m.
New subject: IBM 5150, am I nuts or what?
I now have a few IBM 5150 Personal Computers, latching on to the nicest
ones today along with I think the correct original keyboards. I have to
wonder if I am not perhaps getting a little dotty in my old age. What the
heck am I going to do with them?
Anybody else have some? What can they do?
How about a 5100 (sounded like something I might want to hoard if I see one)?
22 Mar
22 Mar
2:50 a.m.
New subject: IBM 5150, am I nuts or what?
For all the pissing and moaning today about IBM and Microsoft, let's face
it - the original IBM and then the XT are collectibles. They were an
evolutionary step up from the 8-bit 8080's and Z-80's which dominated the
days of "hobbyist" computing (with apologies to the 6502 and 6800 crowds).
The 5150 was initially postioned as a hobby or home computer: cassette tape
interface built in, numeric processor support optional (and expensive), and
no floppy drives available when it first came out. IBM under-anticipated
the demand (just like Radio Shack did) when people started using the 5150
for "business" purposes. When IBM began producing a personal computer, it
legitimized them for corporate America. I even recall reading articles back
in the late 70's about strategies for sneaking computer purchases past the
eyes of the MIS department (who didn't "approve" of these "toy"
computers
coming in and not under their control). But when a computer had the IBM
name on it (and cost as much as it did), MIS departments had to develop a
way to deal with them. And we all know what happened after that!
So IMHO, if you wish to have a computer collection, you should have a 5150
as an example of a significant milestone (millstone?)in small computer /
data processing history.
What can you do with them? Does the term "boat anchor" have any meaning for
you?
Bob Stek
Saver of Lost SOLs
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Mike Ford
Sent: Wednesday, March 22, 2000 4:32 AM
To: classiccmp(a)classiccmp.org
Subject: IBM 5150, am I nuts or what?
I now have a few IBM 5150 Personal Computers, latching on to the nicest
ones today along with I think the correct original keyboards. I have to
wonder if I am not perhaps getting a little dotty in my old age. What the
heck am I going to do with them?
Anybody else have some? What can they do?
How about a 5100 (sounded like something I might want to hoard if I see
one)?
4:58 a.m.
New subject: IBM 5150, am I nuts or what?
Mike Ford wrote:
I now have a few IBM 5150 Personal Computers, latching on to the nicest
ones today along with I think the correct original keyboards. I have to
wonder if I am not perhaps getting a little dotty in my old age. What the
heck am I going to do with them?
Anybody else have some? What can they do?
I started keeping a few 5150s a while ago and probably have 4 or 5. The one
*I* like the best is one built in the UK that still has the box with it.
Someone mentioned a number of years ago that the collectables will really be
something with a brand name rather than no-name clones. I agree, and while I
have a few clones, they are typically the first to go when I need space.
How about a 5100 (sounded like something I might want
to hoard if I see one)?
Nice machine that came in at least two flavors, APL/BASIC and BASIC. I don't
know if there was a 5100 with APL only.
5:15 a.m.
New subject: IBM 5150, am I nuts or what?
Mike Ford wrote:
>
> I now have a few IBM 5150 Personal Computers, latching on to the nicest
> ones today along with I think the correct original keyboards. I have to
> wonder if I am not perhaps getting a little dotty in my old age. What the
> heck am I going to do with them?
>
> Anybody else have some? What can they do?
I have one here in Bristol with the Expansion Chassis as
well as a genuine IBM EGA card (and monitor). The
expansion unit is for the two hard disks that were fitted
as an upgrade to an XT-class machine.
Do? You want it to do something? :-)
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
7:22 a.m.
New subject: IBM 5100 Re: IBM 5150, am I nuts or what?
At 07:58 AM 3/22/00 -0800, Marvin wrote:
> How about a 5100 (sounded like something I might want to hoard if I see
one)?
Nice machine that came in at least two flavors, APL/BASIC and BASIC. I don't
know if there was a 5100 with APL only.
I've never heard of one but it was listed by IBM as an option (BASIC
only, APL only or BASIC & APL). I have the IBM sales data here somewhere.
Joe
5:06 a.m.
New subject: IBM 5150, am I nuts or what?
On Wed, Mar 22, 2000 at 01:31:51AM -0800, Mike Ford wrote:
I now have a few IBM 5150 Personal Computers, latching
on to the nicest
ones today along with I think the correct original keyboards. I have to
wonder if I am not perhaps getting a little dotty in my old age. What the
heck am I going to do with them?
Anybody else have some? What can they do?
I still have mine from 1983. It doesn't do much any more (occasionally
I fire it up because it has the only copy of something), but with the V20
CPU I put it in way back when, it can run the E11 Demo version and be the
world's slowest PDP-11. And it's perfectly fine for editing and stuff.
About 7 years ago I built a hand-wired multi-I/O card when my Quadboard died
and anyway I was sick of having to use an expansion cab just so I could have
two MFM disks and a floppy drive w/o burning up the 62.5W PSU. That was an
IDE port, SCSI-1, 384 KB of SRAM, 4 COM ports, an FDC, and an EPROM with a
bare-bones IDE BIOS, all on a full length prototype card, and I got a 170
MB IDE disk. I had to upgrade to PC-DOS V3.3 because the PC-DOS V2.0 I'd
been using for ten years couldn't use disk partitions as multiple drives,
and anyway it was FAT12 only so even on my ST-225 the clusters were huge.
Anyway that freed up lots of slots so that the thing fit easily in one box,
even with both an HGC+ and a CGA at once, plus a hardware EMS card and
an NE1000.
How about a 5100 (sounded like something I might want
to hoard if I see one)?
I remember reading an article (in Byte?) about that thing ages ago, it
sounds like a bigger version of HP's HP-85 only with APL instead of BASIC?
Anything that strange has *got* to be worth grabbing!
Speaking of which, has the HP-85 totally disappeared? My dad had one
briefly when I was in high school, I remember using it to cheat on my calc
homework and brought in adding machine tapes with the graphs I didn't feel
like sketching by hand... And there was one in the computer showroom
on the second floor of the Harvard Coop. But I haven't seen one since.
IIRC, the BASIC "PRINT" statement *really* meant print, if you wanted the
display to be on the tiny CRT you had to use something else, "TYPE" maybe?
The way they stuck the BASIC keywords on single keys (like a ZX81, only you
didn't have to use them) was crazy, they were scattered all over the place.
But the combination of a cartridge tape drive, adding machine printer, and
teeny tiny CRT was kind of neat, each part was low-end crap but if you put
them all together it was a pretty usable system.
John Wilson
D Bit
7:32 a.m.
New subject: HP 85 Re: IBM 5150, am I nuts or what?
At 11:06 AM 3/22/00 -0500, John wrote:
> How about a 5100 (sounded like something I might want to hoard if I see
one)?
I remember reading an article (in Byte?) about that thing ages ago, it
sounds like a bigger version of HP's HP-85 only with APL instead of BASIC?
Anything that strange has *got* to be worth grabbing!
A 5100 is definitely worth grabbing!
Speaking of which, has the HP-85 totally disappeared? My dad had one
briefly when I was in high school, I remember using it to cheat on my calc
homework and brought in adding machine tapes with the graphs I didn't feel
like sketching by hand... And there was one in the computer showroom
on the second floor of the Harvard Coop. But I haven't seen one since.
IIRC, the BASIC "PRINT" statement *really* meant print, if you wanted the
display to be on the tiny CRT you had to use something else, "TYPE" maybe?
The way they stuck the BASIC keywords on single keys (like a ZX81, only you
didn't have to use them) was crazy, they were scattered all over the place.
But the combination of a cartridge tape drive, adding machine printer, and
teeny tiny CRT was kind of neat, each part was low-end crap but if you put
them all together it was a pretty usable system.
Nope, there are still lots of HP 85s out there chugging away everyday.
They're still widely used as test equipment controllers. I have about 10
of them here. The great thing about the 85 was that you got a usable
display, keyboard, printer and a mass storage device in one compact unit.
And you could add HP-IB, serial or parallel interfaces, special functions
or more memory just by plugging them into the back. You didn't have to be
a software engineer, hardware engineer or test equipment engineer to set
one up and use it. Their math was also much more accurate than the run of
the mill computer.
Joe
8:51 a.m.
New subject: IBM 5150, am I nuts or what?
Mike Ford <mikeford(a)socal.rr.com> wrote:
How about a 5100 (sounded like something I might want
to hoard if I see one)?
I own one which I've never even seen. :-(
They're fairly hard to come by, and tend to be expensive. Unless you
can find one from someone who doesn't realize that they are "collectable".
The 8K static RAM cards are apparently the same as those used in several IBM
systems at that time, including the System/32. Unfortunately System/32 boxes
are even harder to find than the 5100.
3:13 p.m.
New subject: IBM 5150, am I nuts or what?
Speaking of which, has the HP-85 totally disappeared?
My dad had one
briefly when I was in high school, I remember using it to cheat on my
calc homework and brought in adding machine tapes with the graphs I
didn't feel like sketching by hand... And there was one in the computer
showroom on the second floor of the Harvard Coop. But I haven't seen one
since. IIRC, the BASIC "PRINT" statement *really* meant print, if you
wanted the display to be on the tiny CRT you had to use something else,
"TYPE" maybe? The way they stuck the BASIC keywords on single keys (like
a ZX81, only you didn't have to use them) was crazy, they were scattered
all over the place. But the combination of a cartridge tape drive,
adding machine printer, and teeny tiny CRT was kind of neat, each part
was low-end crap but if you put them all together it was a pretty usable
system.
They show up at flea markets from time to time... I've seen a number
of them at the MIT flea... I have one. Yes, the command PRINT does
so to the integral printer... DISPLAY outputs to the screen. The
tape drive uses the same cartridges as the TU58, though I am not
sure if the formatting is the same...
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 |
+--------------------------------+-------------------------------------+
5:12 p.m.
New subject: HP 85 Re: IBM 5150, am I nuts or what?
At 09:13 PM 3/22/00 -0500, Megaan wrote:
It's not but INITIALIZE takes care of that! But be aware that that the
rubber feed wheels in most 85s have long since melted away.
Joe
Speaking of which, has the HP-85 totally
disappeared? My dad had one
briefly when I was in high school, I remember using it to cheat on my
calc homework and brought in adding machine tapes with the graphs I
didn't feel like sketching by hand... And there was one in the computer
showroom on the second floor of the Harvard Coop. But I haven't seen one
since. IIRC, the BASIC "PRINT" statement *really* meant print, if you
wanted the display to be on the tiny CRT you had to use something else,
"TYPE" maybe? The way they stuck the BASIC keywords on single keys (like
a ZX81, only you didn't have to use them) was crazy, they were scattered
all over the place. But the combination of a cartridge tape drive,
adding machine printer, and teeny tiny CRT was kind of neat, each part
was low-end crap but if you put them all together it was a pretty usable
system.
They show up at flea markets from time to time... I've seen a number
of them at the MIT flea... I have one. Yes, the command PRINT does
so to the integral printer... DISPLAY outputs to the screen. The
tape drive uses the same cartridges as the TU58, though I am not
sure if the formatting is the same... 
23 Mar
23 Mar
7:33 a.m.
New subject: HP 85 Re: IBM 5150, am I nuts or what?
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9:02 a.m.
New subject: HP 85 Re: IBM 5150, am I nuts or what?
It's
not but INITIALIZE takes care of that! But be aware that that the
rubber feed wheels in most 85s have long since melted away.
Presumably they can be rebuilt, though. I've got an HP9815 (uses the same
cartridges) tape drive in bits on the bench at the moment, and the
capstan looks/feels good as new. If it wasn't, it doesn't look impossible
to repair it.
9:46 a.m.
New subject: Lobo Drives
In browsing my back email, I ran across one from a person who used to work
at Lobo. Here is part of his reply (the Elephant Bar is a local restaurant
and Lobo was Roger's pet wolf):
"Roger may know most of the
inside stories of the Max-80, but I worked pretty closely with the
engineering department, being a technical guy. For example, the sillouette
of Lobo was drawn by a Mr. Greg Hertzen (sp?) Greg wanted to use a red LED
(indicating a bit of mysticisism to be associated with the machine), but
they went with yellow (or was it green?) which was more in keeping with
Max's color scheme. As I recall, Arleen Hertzen (sp?), who was Greg's wife
worked mainly on the Preliminary Manual. The penciled revisions you
mentioned may well be Arleen's. The guy who developed the Max-80, a
brilliant man named Kirk Hobart, used to work as a consultant (I believe),
out near The Elaphant Bar."
10:51 a.m.
New subject: DEC ADV11-A A/D Converter
Out of curiosity is there anything I need to know before plugging the
following board into a Q-Bus PDP-11?
A012 ADV11-A Q 16-channel, 12-bit Analogue-to-Digital Converter
A012 Caution: uses BC1 for purposes other than BDAL18
A012 Refs: EK-ADV11-OP, MP-00193, EB-20174-20, uNOTE O#108
My plan has been to plug it into my PDP-11/73 which resides in a BA123.
Also is there any way to test one without having anything connected.
Zane
11:11 a.m.
New subject: DEC ADV11-A A/D Converter
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11:31 a.m.
New subject: DEC ADV11-A A/D Converter
You mean like "this board isn't compatible with a 22bit backplane" kinds of
things. (which it isn't BTW, that's what the note is about BDAL18 is
address line 18 which is called BC1 on 18 bit backplanes.)
I'm not sure how you would use it in a system with a 22 bit backplane. Even
if you pulled the address line off the back plane the board's CSR registers
would show up in memory space and you would have bus contention.
--chuck
At 01:51 PM 3/23/00 -0800, you wrote:
Out of curiosity is there anything I need to know
before plugging the
following board into a Q-Bus PDP-11?
A012 ADV11-A Q 16-channel, 12-bit Analogue-to-Digital Converter
A012 Caution: uses BC1 for purposes other than BDAL18
A012 Refs: EK-ADV11-OP, MP-00193, EB-20174-20, uNOTE O#108
My plan has been to plug it into my PDP-11/73 which resides in a BA123.
Also is there any way to test one without having anything connected.
Zane
11:57 a.m.
New subject: DEC ADV11-A A/D Converter
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11:57 a.m.
New subject: DEC ADV11-A A/D Converter
That's kind of what I thought it meant :^( Guess I really will have to get
the PDP-11/23 up and running if I want to play with this board.
Zane
You mean like "this board isn't compatible
with a 22bit backplane" kinds of
things. (which it isn't BTW, that's what the note is about BDAL18 is
address line 18 which is called BC1 on 18 bit backplanes.)
I'm not sure how you would use it in a system with a 22 bit backplane. Even
if you pulled the address line off the back plane the board's CSR registers
would show up in memory space and you would have bus contention.
--chuck
At 01:51 PM 3/23/00 -0800, you wrote:
Out of curiosity is there anything I need to know
before plugging the
following board into a Q-Bus PDP-11?
A012 ADV11-A Q 16-channel, 12-bit Analogue-to-Digital Converter
A012 Caution: uses BC1 for purposes other than BDAL18
A012 Refs: EK-ADV11-OP, MP-00193, EB-20174-20, uNOTE O#108
My plan has been to plug it into my PDP-11/73 which resides in a BA123.
Also is there any way to test one without having anything connected.
Zane
7:30 a.m.
New subject: IBM 5150, am I nuts or what?
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8893
days inactive
8894
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19 comments
13 participants
participants (13)
-
allisonp＠world.std.com -
ard＠p850ug1.demon.co.uk -
bobstek＠ix.netcom.com -
cmcmanis＠mcmanis.com -
eric＠brouhaha.com -
healyzh＠aracnet.com -
John.Honniball＠uwe.ac.uk -
marvin＠rain.org -
mbg＠world.std.com -
mikeford＠socal.rr.com -
pete＠dunnington.u-net.com -
rigdonj＠intellistar.net -
wilson＠dbit.dbit.com