This guy in the Boston area has a Heathkit H-89 he would like to give
away. Please contact him directly.
Reply-to: sussman(a)alum.mit.edu
---------- Forwarded message ----------
Date: Mon, 20 Nov 2000 17:37:58 -0800
From: Steven Sussman <sussman(a)alum.mit.edu>
Subject: VCF Feedback!
I'm giving away a Heathkit(Zenith) H-89 to whomever will take it off my
hands in the Boston area.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
On Nov 20, 23:11, Tony Duell wrote:
> > Do I have a point? I guess my point is I'm trying to get off 10Base2,
why
>
> Hmmm... I'm moving towards 10Base2 and away from 10BaseT
>
> For older (classic) computers, the bus bandwidth won't support 100Mbps
> ethernet, so you have to go with one of the 10Mbps standards (I'll ignore
> the original 3Mbps.. :-)).
>
> 10BaseT seems to have advantages when :
> The computers are spread out all over the building (which doesn't apply
> to my setup, where most of the networkable machines are next to each
other)
>
> The network is being used by a number of people. After all, unplugging
> the 'wrong' BNC connector from a T-piece can bring the entire network
> down. This doesn't happen if you're the only person fiddling with the
> network.
>
> Against that :
>
> 10BaseT needs a hub. This is one more thing to find space for, one more
> thing to have to power, and one more thing that you have to maintain.
> Getting spare chips for most hubs is a lot harder than getting spare
chips
> for 10base2 transceivers.
>
> Adding a machine to a 10BaseT network means running a cable back to the
> hub. Adding a machine to a 10Base2 network can mean just patching it to
> the cables on the nearest machine. Yes, the latter does bring the network
> down, but with my setup, that's less of a problem than running another
> cable.
>
> The BNC connector is a lot faster to wire than that darn RJ45,
> particularly when you have fiddle about with the wires to get them to the
> right contacts. And the solid, metal, BNC connector would seem to be more
> reliable than the RJ45 as well.
I tend to disagree with that. I've had lots of BNC's come off or go flaky
after someone has pulled the cable, but I've only once had that happen to
an RJ45. And I bet I can strip and crimp an RJ45 as fast as most people
can crimp a BNC.
The reason I like UTP is that if you once put in the infrastructure, you
can use the structured wiring for lots of things. At work, we run
Ethernet, RS232, telephones (POTS), ISDN, and video over Cat5/5e structured
wiring. At home, I put in cables in lots of places and use it for serial,
network, ISDN, and POTS. You do need to put enough cable in enough places,
though.
The other reason, of course, is that there are lots more LEDs to flash if
you use a hub :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
> Much of the random logic in the 380Z (address
> decoding, video timing
> decoder, etc) is done in small bipolar PROMs. These
> look a bit like TTL
> devices, and may even have 74xxx numbers.
>
> The blank chips are identical (both are 74S2872,
> 256*4 bit PROMs), but
> the programming is different.
>
AH! Controrary to what I was led to believe. I never
new there were 74xxx coded proms. I do now :)
)
> >
> > In what format? Electronic? (i.e. easily
> sharable?)
>
> No, on paper. I don't have a scanner, heck, I only
> have a text display on
> my PC, so I don't ever use electronic manuals. Quite
> apart from the fact
> that paper ones are a lot more portable.
Shame :(
> The official _commented_ source listing would have
> been interesting for
> the comments. I know these can be recreated, but...
>
Fair enough. I'll keep my eyes open for it...(sad
optimism)
> The schematics show that the COS ROMs (on the CPU
> board) are 3 rail ones,
> needing +5V, +12V and -5V. A lot of modern
> programmers can't handle these
> (the last 3-rail EPROM that I came across was the 2K
> byte TMS2716, which
> is _ancient_).
>
OH! Something else that became obsolete before I
started taking things apart...(I'm only 23)
That would explain rather a lot. I'll have to build
me an eprom dumper then.
I'll get one of them 24 bit (8255 based) ISA IO cards
>from maplin (about 25 quid ISTR) and make one up.
I'll probably be needing some data on the chips then -
normally I would generate the -5v with a simple
switched-capacitor or 'flying capacitor' inverter
arrangement - but if it needs more than a couple of
millamps, i'm gonna need a -5v psu as well :-/ Hmmm!
How about the one in the RML380z! I will get the
contents of those roms - even if it kills me...
> > > Are you sure this is a standard RML disk
> controller?
> > > I can't find any LED
> > > on the schematics, and I don't remember there
> being
> > > one when I looked
> > > inside my machine. The standard disk controller
> is
> > > one card that fits
> > > onto the 50 way 'bus' ribbon cable, and which
> > > contains a 1771 disk
> > > controller (Single density only) and a
> 8251-based
> > > serial port (device SIO-4)
> >
> > Um, no! I know nowt about this box - I'll check
> the
> > disk controller very carefully tonight. Its
> software
> > is certaining interesting - very wacky code, quite
> a
>
> What softwre? and for that matter, you mention a
> disk ROM, which I have
> never heard of...
>
> The disk cotnroller schematic I have shows the
> following chips (only).
>
> Location Type
> AQ 74LS244 (address buffer)
> AR 74LS245 (data buffer)
> AP 74LS244 (Control line buffer)
> BR 74LS138 (address decoder)
> BP 74LS32
> CP 74LS02
> BU 74LS393 (clock divider)
> DP 4020 (more clock division)
> CQ 74LS32
> ES 74LS74
> DQ Z80A-CTC (baud rate, timing generator)
> ER 8251 (serial USART)
> CR 74LS00 (?)
> DU 74LS123
> AV 1488 (RS232 driver)
> BV 1489 (RS232 receiver)
> CS WD1771 (disk controller)
> BT 74LS157
> AT 7416 (disk output driver)
> BU 74LS244 (disk input receiver)
> CT 74LS193
> DT 74LS42
> CU 74LS96
> ET 74LS00
> EU 74LS08
>
> No RAM, ROM, or CPU.
>
After checking it out some more it has:
dated '83, where most of the box is '79
Z80A CPU,
Z80 CTC,
8Kbyte EPROM (HUUUUGE!)
MK4802 2Kbx8 SRAM
MK3884N which is a mostek sourced Z80SIO-a-like POSH!
MB8877a which I believe is a 5voltonly WD1793
i.e. A double density controller. There are obviously
other devices - I just didn't note them.
Looks like a more advanced double density dual drive
controller then :) I wonder if it's double-sided as
well??? I'll have to check my WD1793 docs.
So! Have I got something a bit different then?
Dave.
__________________________________________________
Do You Yahoo!?
Yahoo! Shopping - Thousands of Stores. Millions of Products.
http://shopping.yahoo.com/
On Nov 20, 15:05, Shawn T. Rutledge wrote:
> On Mon, Nov 20, 2000 at 01:44:17PM -0800, healyzh(a)aracnet.com wrote:
> > Do I have a point? I guess my point is I'm trying to get off 10Base2,
why
> > would I want 10Base5 :^) I'd much rather have another 10/100 Switch
than
> > any 10Base5 stuff!
>
> Last I checked, 10base2 still has a distance advantage, perhaps enough
> to matter for really large buildings.
Yes, 185 metres instead of 100m -- and 10base5 will go to 500m. But you
can do better and faster with fibre.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Plotters and parts
The local computer surplus exchange in Kansas City has several HP 7475A's.
They would probably go for $10-15 plus shipping, make them an offer. There
are carousels for them. Contact them at sesales(a)crn.org.
Mike
mmcfadden(a)cmh.edu
While cataloging this huge pile of TI and Amiga stuff I recently
received, I took a moment to flip through some of the stacks of old
magazines that were with it. I noticed a 5 & 10 meg hard drives for
the TI. That's interesting I thought but what really caught my eye
was the add from Morning Star Software for a CP/M processor
board for the 99/4A. 5 MHz 8085, 64K RAM with 8K ROM. Has
anyone ever seen one of these or any other coprocessor boards for
the 99? I've always had a fascination with coprocessor cards for
different systems. There was a 6809 card for the Apple II I would
have killed for years ago. I'd assume these 99/4A CP/M boards
would be few and far between.
-----
David Williams - Computer Packrat
dlw(a)trailingedge.com
http://www.trailingedge.com
Jarkko Hermanni Teppo <jate(a)uwasa.fi> wrote:
> I have a couple of HP related questions. I started thinking about these
> while I was scanning all the 9000/500 docs that I have and in HP 27110B
> HP-IB card manuals I saw a sentence similar to this "..supported in all
> HP computers with CIO bus..".
>
> 1. Which machines had the CIO bus ? I know of 9K/550, 520 and at least some
> version of the bus in some 800-series machines.
Some (earlier) HP 3000 series 900s too. Of course they are similar hardware
to 9000/800s. If Stan Sieler is reading he can probably say more about this.
> 2. I know about 200/300/400/500/700/800-series but what is 9000/600 which
> I've seen in a couple of manuals.
I don't remember but think they are PA-RISC-based. I don't remember seeing
much about the series 600s so I suspect it was a marketing thing that didn't
last real long.
> 3. Is the HP 7970 tape drive vacuum column or one of these newer streaming
> devices (like the 7974A).
None of the above. It's older, non-streaming, and it uses tension arms.
> And extra bonus-points for the person who recognizes the app in the cover
> of the HP 9000 550 manual at
>
> http://www.tec.puv.fi/~s99137/kuvat/cover.gif
No idea, but it's interesting to see that the 9000/550 also had the
number 9050.
> And a couple of low-quality "recognize the peripheral"-pics at:
> http://www.tec.puv.fi/~s99137/kuvat/uudet/ (none of those are mine, btw.)
>
> Particularly cipher.jpg, HP2000[12].jpg, nauha.jpg, hp3kcons.jpg.
hp20001.jpg is an HP 2114 minicomputer.
hp20002.jpg is a 21MX mini of some sort. I'm away from my manuals so
can't easily tell which series.
hp3kcons.jpg pictures an HP 2647F that was sold with an HP 3000 series
64/68/70 for use as its console. I'm thinking that for about the first year
of shipments of the 3000/64, the 2647F did not have the "hp3000" plate
on the front, just the usual 2647F plate.
> --
> Jarkko Teppo | Lahjoita HP 7933:n levypakka hyv??n kotiin!
ObUglyAmerican: what are you saying about the 7933?
When I first saw one, in 1982, I thought "wow, it's so big!". Imagine
my surprise when a new cow-orker saw a 7935 at Wollongong in 1995 or
so and said about the same thing. I had been thinking about the
capacity: 404MB was pretty impressive for a washing-machine drive back
in 1982. He was clearly thinking about the size, and comparing it
with 540MB drives then popular in desktop Wintel PCs.
-Frank McConnell
Please contact original message author (shown below) if you have rescue
this one.
-jim
---------- Forwarded message ----------
Date: Mon, 20 Nov 2000 12:05:18 -0500
From: Nathan Lauver <nlauver(a)acsworld.net>
To: jimw(a)computergarage.org
Jim,
My company is in posession of an IBM System/36, most of the docs, lots of software,
the line printer, two terminals, and an ISA-based emu card for a pc. I can't
find anyone to buy it, and it's getting cold. It's in a pavillion-like storage
area outside.
I talked to the powers that be, and said if I can even just get it out of our
way, they'd be happy. Would you be interested in picking it up, or having it
shipped? We're located in Central PA.
-Nathan
I guess it passes the 10-year rule, and it's got some CPUs in it (Z8xxx's)
so maybe it's not as off-topic as I thought... ;-)
We (my fellow techo-packrat housemate and myself) were recently given a
Toshiba Strata XXe phone system and about 35 EKT-series phones by his
company when they got a new system. It was working when disconnected, but
we received no installation manuals - just phone user guides. It's all
there, with (from what I've gathered from various web sites) an HCAU (CPU),
an HCBU (aux CPU), two HCOU (central office) cards, an HINU (intercom) card,
three HSTU-2 and one HSTU-5 (station cards), and an operator's console, but
when they removed it, they just hacked off the 25-pair (or are the 50 pair?)
cables from the HSTU cards, so I've got no way of knowing which pairs go to
the phone jacks. Was wondering if anyone can point me to some information
about this. Several hours of web searching has turned up some tantalizing
hints, but nothing I want to risk blowing something up by trying. Any help
would be very much appreciated. I found one company that will sell me a
manual, but it's a weekend and this phone system _really_ wants to be hooked
up! :-)
Background info (if you're interested):
We have half the stuff in the house automated with X-10 power control
modules and the "Mister House" software using motion sensors, etc. to run
lights, a 300 disc CD changer, software-based phone answering machine, etc.
Mister House (www.misterhouse.net) is mostly a bunch of Perl scripts that
can be made to do most anything with enough work. It also has voice I/O
capability. I've got the whole place wired with ethernet, with laptops in
most of the rooms. I've also got 4-pair CAT3 phone wire to each room. I'd
like to use the XXe to run our phones, as well as letting "Mister House" use
the hands-free intercom functions to talk to us around the house and/or
receive commands from us.
-Bill Richman (bill_r(a)inetnebr.com)
Web Page: http://incolor.inetnebr.com/bill_r
Home of the COSMAC Elf Microcomputer Simulator, Fun with
Molten Metal, Orphaned Robots, and Technological Oddities.
