I have available the folllowing manuals :
Plessey PM80 Core Memory manual ( Omnibus core mem boards,, extensive
description )
Applied Digital Data Systems "How to use the Consul 520" (Description
of an ascii terminal)
Calcomp 836 Technische beschreibung ( Manual for early Calcomp plotter,
in German )
Calcomp Pen and Paper user guide.
DEC OS8 mark sense batch user guide
Control Data NOS2 reference set volume 3 "System commands"
(For CDC cyber machines)
Terms : Free , you pay P&P from Zurich Switzerland.
In case of multiple requests i will decide in an utterly undemocrating
way who gets what.
Jos Dreesen
I've not seen anyone else mention it, so for the other UK folks on the
list it's worth mentioning that this newsgroup has shown up.
So far low-traffic, and seems to be mainly 8-bit fans who are into
games, but it might be worth keeping an eye on. I mentioned there that
we're all over here on classiccmp :-)
cheers
Jules
>
>Subject: TEAC FD-55GFR = Quad Density?
> From: "Joe R." <rigdonj at cfl.rr.com>
> Date: Fri, 07 Oct 2005 19:15:04 +0000
> To: cctalk at classiccmp.org
>
> I found a pair of these drives and picked them up since my reference said
>that they were quad density drives AND they had DS-QD disks in them.
>However I looked on the net and found that everyone including Teac's site
>says that they are HD (1.2Mb) drives. Which are they? I THINK these have a
>jumper that chages the speed from 360 RPM to 300RPM. Will this make the
>drive a QD drive? I thought the heads needed to be differnt since the
>magnetic media on the disks have different permeability.
>
> Joe
TEAC FD-55GFR aka DEC RX33.
Quad density/1.2mb PC drive. QD term is appled to any drive that
does 96TPI two sided normal rotation speed(300rpm). The Teac can
also do the abnormal(360rpm) PC speed and there are both jumpers
and pins on the edge connector to control that.
Good solid drive that is very flexible. I have a bunch I kept
as they cant be beat with a big stick.
Allison
I thought I would try something new, so I just posted two Zenith
MiniSport systems I have for auction at Sellam's VCM website. This is
my first VCM listing, I thought I should give it a try.
As some of you know, I'm helping with an exhibition of classic machines
in the Department of Computer Science -- for Open Day tomorrow
(Friday), and running conducted tours on Wednesday as well.
Well, one of the supposedly-working exhibits is my KIM-1, but it died
this afternoon. I can't get it to do more than occasionally display a
single zero, on the leftmost 7-segment display. A cursory look with a
logic probe (and no docs to hand) shows the clock is running and at
least a few address lines are too. I bet it's a memory fault.
What are the common faults? I'm hoping it's one of the 2102 RAMs,
because I stand a chance of having a suitable replacement. However, I
fear it's more likely a 6530, and I assume they're unobtanium. Has
anyone ever come up with a kludge to effectively use a 6532 (and are
they any easier to find?) with an EPROM? Or anything else?
--
Pete Peter Turnbull
Network Manager
University of York
Hi
About 10 years ago I obtained what seems to be the entire set of
plug-boards, the two wire-wrapped backplanes as well as the complete core
memory module from an original PDP-8. I also have the front panel, but I
might want to keep that in my collection.
I'm thinking of selling these components (possibly on eBay) to somebody who
might want to keep them as spares, or who is reviving one of these monsters.
The catch is that it is in South Africa, though I don't expect the postage
on the cards themselves to be prohibitive. The backplanes might be a quite
a bit more (heavy & large)
Obviously I cannot say whether they are still working, but what I can say is
that I rescued as much of the complete computer as I could from a guy who
was going to sell it to a scrap iron place. He had tendered on it at a
redundant equipment auction held by a prominent SA scientific institution.
I had no storage space at the time so I was forced to let the (very heavy &
bulky) frame and power supplies go :^(
Do you guys (and gals) expect it to be worth my while listing it ? Maybe at
the marketplace ? Would there be import restrictions into the USA on
something like this ?
Any comments greatly appreciated...
Many thanks
Pieter Botha
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At 19:15 07/10/2005, you wrote:
> I found a pair of these drives and picked them up since my reference said
>that they were quad density drives AND they had DS-QD disks in them.
>However I looked on the net and found that everyone including Teac's site
>says that they are HD (1.2Mb) drives. Which are they? I THINK these have a
>jumper that chages the speed from 360 RPM to 300RPM. Will this make the
>drive a QD drive? I thought the heads needed to be differnt since the
>magnetic media on the disks have different permeability.
>
> Joe
One of my favorite FDDs.
These will do either HD or DD (called QD because it is 80 tracks).
The recording density (HD or DD/QD) is defined by interface pin #2.
'LG' strap ON : Pin2 Hi = DD/QD, Pin2 Low = HD
'LG' strap OFF: Pin2 Hi = HD, Pin2 Low = DD/QD
You also need to run the drive at 300 RPM in you are using a
standard 250khz transfer rate controller - To do this, put
strap 'I' ON - this will run at 360 during HD operation, and
300 during DD/QD operation - with 'I' OFF, the drives runs at
360 rpm all the time.
NOTE: A PC controller transfers data to HD drives running in
DD/QD mode at 300khz, which means that PC drives always run at
360rpm - but for a non PC/HD controller, the data rate will be
250khz, and you need to jumper the drive to run at 300rpm.
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html
>From: ard at p850ug1.demon.co.uk
>
>>
>> On Oct 6 2005, 22:03, Tony Duell wrote:
>> > > fear it's more likely a 6530, and I assume they're unobtanium. Has
>> > > anyone ever come up with a kludge to effectively use a 6532
>>
>> > My Commodore 8250LP disk drive has an official kludgeboard in what
>> seems
>> > to be a socket designed for an 6530. It contains a 6532, a ROM, and a
>> > simple TTL chip ('04 or something like that).
>>
>> Sounds like a start. I obviously can't get this fixed for, er, today,
>
>Argh, I misremembered it :-(. I've found the schematic I traced out. It
>contains a 6530 (not a 6532), a 2716, and a 74LS04.
>
>The 6530 pins are wirrd to corresponding pins on the header, apart from
>RS0/, which is tied high (to disable the internal ROM of that chip). The
>2716 A0..A9 go to the corresponding header pins, A10 is grounded. D0..D7
>on the 2716 also go to the obvious header pins. OE/ goes to RS0/ on the
>header. CS/ is Phi_2, inverted by one of the gates in the '04.
>
> I don;t know if you could do a similar thing with a 6532, I think you
>could. At least this would let you use any 6530 with the appropriate
>chip-select polarites, no matter what was in the ROM.
Hi Tony
This is not totally true. I don't recall just what
it was but there are some mask options that are not easily
handled from the outside of the part. I just don't
recall what it was. I was looking at doing something
similar rather than pay about $120 to replace a sound
board on my Gottlieb Genie pinball machine.
As I recall it was an inversion of one of the data port's
outputs as a mask option or something like that.
Dwight
dont have one, but want one. I hope youll make disk
images available.
--- cctech-bounces at classiccmp.org
<chenmel at earthlink.net> wrote:
> Does anybody else on the list have an MPX-16 system?
I recently
> acquired one from a list member and am wondering how
many of these
> systems still exist. I have a large (relatively)
collection of
> diskettes with mine.
>
> The MPX-16, for those not familiar with it, was
published as a project
> in Steve Ciarcia's 'Circuit Cellar' column in Byte
magazine. It was a
> three part 'construction' article and the machine
was sold by MicroMint
> for a time. What I've heard is that about 500
machines in total were
> produced.
>
> It's an early 'IBM Compatible' in that they designed
it to be similar to
> the PC, but only to a certain degree. It uses a
serial console rather
> than keyboard/display adapter, and it runs CP/M-86
and supposedly MS-DOS
> though I don't have DOS diskettes for mine. It has
ISA slots and a
> similar architecture to the IBM-PC, coming out of
that early era before
> there were PC clones from the likes of Compaq.
>
> I'm curious of how many other MPX-16 systems have
survived to today.
> There isn't a lot about it online. I can share what
information I have,
> as I have manuals and docs with my system. I'm
interested in hearing
> from other people with this machine.
>
> Scott
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