Hey all;
My wife's grandfather started a company that made the first digital meter
for propane (and other gaseous) distribution and they're clearing out
their old facility (which the family calls the Car Barn, for his
collection of vintage Packards now stored there). Couple of goodies, but
I'm afraid I'm having trouble finding much on some of them, thought
perhaps those out there might be able to help.
The first is a Victor 9000 which I found some descriptions of and, thanks
to Al, a manual on BitSavers. I'll dig into that one later.
The next is a 'Rex Microcomputer System', model REX-1032, "Manufactured by
Realistic Controls Corporation of Davenport, Iowa". I'm guessing this is a
kit computer that's been put together by this local company, but "Rex
Micrcomputer" gets me nothing via google and breaking it down gives me
screeds of irrelevancies. The machine has a Z80 microprocessor, although
it might have another (ala Rainbow) and I just haven't dug far enough.
The last is quite a beasty, weighing plenty thanks to its significantly
hefty linear power supply. Intersil Development System, ISB 80DS 3020-120.
Got six apparently serial ports on the back with what I think is a console
cable hanging out one side. What I like best is the socket mounted in the
front plate for reading/writing 24 pin DIP chips. Two 8" drives with
diskettes in them, God only knows if they're still good after sitting out
for this long.
I'll give all of the above a good part of the day to warm back up (20F
last night in Iowa and they sat out in my car, the boards are now
sufficiently slick with condensation in my office) and see what I get. I
have a monitor for the Victor and the Rex (a rather adorable 8" Sanyo TV),
we'll see what happens on the Intersil.
I'd love to hear from anyone who is famaliar with these, on or off-list,
your choice.
JP Hindin
Iowa
>
>Subject: Re: S100 Floppy Controller Question
> From: M H Stein <dm561 at torfree.net>
> Date: Tue, 13 Nov 2007 01:13:48 -0500
> To: "'cctalk at classiccmp.org'" <cctalk at classiccmp.org>
>
>---------------Original Message:
>
>Date: Sun, 11 Nov 2007 17:51:09 -0500
>From: Allison <ajp166 at bellatlantic.net>
>Subject: Re: S100 Floppy Controller Question
>To: cctech at classiccmp.org
>Message-ID: <0JRD004G7656LL73 at vms044.mailsrvcs.net>
>Content-Type: text/plain; charset=iso-8859-1
>
>>
>>Subject: Re: S100 Floppy Controller Question
>> From: M H Stein <dm561 at torfree.net>
>> Date: Sun, 11 Nov 2007 17:33:20 -0500
>> To: "'cctalk at classiccmp.org'" <cctalk at classiccmp.org>
>
><snip>
>>I think Tim's point was that if your controller's smart enough to deal with a
>>relatively modern 8" drive like a TM848 it could probably deal equally
>>well with a 5.25" HD drive and you could transparently restore an 8" image
>>(if you have one) to the 5.25" disk. The controller (and CP/M) would not
>>even know that it's a 5.25 instead of an 8"; my Cromemcos certainly don't,
>>although a different FDC might well require some mods to the BIOS.
>
>Different FDC WILL require a different bios. Same for SERIAL IO.
>
>Allison
>
>-----------Reply:
>
>I think you might have misunderstood, Allison; sounds like you thought I was
>talking about replacing an FDC with one other than what the BIOS is configured
>for; obviously that will require mods to the BIOS.
Ok, then same fdc but sufficiently differnt drive requires new (modified) bios.
Changes that affect a bios:
Motor on/motor runs continiously.
Step rate, head load delay, motor on delay
Different on disk format (likely with 8 to 5")
>What I was responding to was a previous post that suggested replacing an 8"
>drive with a 5 1/4" HD drive might require mods to the BIOS, and I just wanted
>to mention that this is not the case with a Cromemco 16/64FDC, to which a
>TM848 and a JU475 appear identical as long as the jumpers on the 5 1/4 drive
>are set correctly and it supplies /READY, and that this may also apply to some
>other controllers. Also, if the controller has both 8" and 5 1/4 connectors and
>they are effectively in parallel as they are on the Cromemco, you may not
>even need a 50<>34 pin adapter cable.
if the drive supplies ready _MAYBE_. If the Drive has the same step rate.
>Nevertheless, controllers meant for some of the older, non-'standard' 8" drives
>probably will require changes to the BIOS, and likely also hardware mods.
BTDT, drive changes ultimately a BIOS and in few cases the mods are small
and most not interchangeable.
Allison
>
>mike
-------------Original Message(s):
Date: Sun, 11 Nov 2007 21:25:13 -0800
From: "Chuck Guzis" <cclist at sydex.com>
Subject:
On 11 Nov 2007 at 20:49, Jim Leonard wrote:
> The digitized examples (Kennedy, etc.) weren't that much better
> either... I wonder, with modern computers making the FFT analysis, could
> the computalker produce intelligible output? I can only assume that the
> original analysis was limited by the speed of its day.
I don't know--the CT was a strange board. I do recall at one point
having a Votrax Type'n'Talk RS-232 text-to-speech box installed on a
terminal. To this day, I still say "ok" (rhymes with "sock")... ;)
Cheers,
Chuck
-----------------Reply;
Same here; one of the Cromemcos had a Votrax on a dedicated port
that announced the user's name and port no. when he/she logged in,
and for many years I've had a PC set up with an RS-232 speech card
that announces the caller's name and number when my phone rings,
as well as logging the call.
mike
---------------Original Message:
Date: Sun, 11 Nov 2007 17:51:09 -0500
From: Allison <ajp166 at bellatlantic.net>
Subject: Re: S100 Floppy Controller Question
To: cctech at classiccmp.org
Message-ID: <0JRD004G7656LL73 at vms044.mailsrvcs.net>
Content-Type: text/plain; charset=iso-8859-1
>
>Subject: Re: S100 Floppy Controller Question
> From: M H Stein <dm561 at torfree.net>
> Date: Sun, 11 Nov 2007 17:33:20 -0500
> To: "'cctalk at classiccmp.org'" <cctalk at classiccmp.org>
<snip>
>I think Tim's point was that if your controller's smart enough to deal with a
>relatively modern 8" drive like a TM848 it could probably deal equally
>well with a 5.25" HD drive and you could transparently restore an 8" image
>(if you have one) to the 5.25" disk. The controller (and CP/M) would not
>even know that it's a 5.25 instead of an 8"; my Cromemcos certainly don't,
>although a different FDC might well require some mods to the BIOS.
Different FDC WILL require a different bios. Same for SERIAL IO.
Allison
-----------Reply:
I think you might have misunderstood, Allison; sounds like you thought I was
talking about replacing an FDC with one other than what the BIOS is configured
for; obviously that will require mods to the BIOS.
What I was responding to was a previous post that suggested replacing an 8"
drive with a 5 1/4" HD drive might require mods to the BIOS, and I just wanted
to mention that this is not the case with a Cromemco 16/64FDC, to which a
TM848 and a JU475 appear identical as long as the jumpers on the 5 1/4 drive
are set correctly and it supplies /READY, and that this may also apply to some
other controllers. Also, if the controller has both 8" and 5 1/4 connectors and
they are effectively in parallel as they are on the Cromemco, you may not
even need a 50<>34 pin adapter cable.
Nevertheless, controllers meant for some of the older, non-'standard' 8" drives
probably will require changes to the BIOS, and likely also hardware mods.
mike
Hi,
I don't know if anyone else noticed but MIT has released the source (and
documentation) to MULTICS. The link is:
http://web.mit.edu/multics-history/
I haven't gone through it (yet) but thought I should bring this great
news to everyone's attention.
--
TTFN - Guy
Hi Guys,
A friend of mine is cleaning his basement, and offers up some
equipment, located near Ottawa, Ontario Canada. Please see:
http://www.ba23.org/blog/2007/11/12/index.html#free
> Free gear available for pick-up in Ottawa. Will consider shipping
> if you are willing to pay packaging and shipping costs.
>
> I need to get this stuff out of my basement.
>
> - Sun 3/50 and Sun 3/160
> - MicroVAX-II in a BA123 enclosure
> - DEC RL02 drives
> - AlphaServer 2100
> - DECstation 3100
> - SPARCstation IPC
> - VT100 Tempest
>
>
> There will be more gear available. I will update this webpage as
> I sort out the gear -- http://www.ba23.org/page0290.html
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html
From: Sridhar Ayengar <ploopster at gmail.com>
>
> Brian L. Stuart wrote:
> > segmentation structure. Unfortunately, it's only got 32-bit
> > addresses. Even in the 60s, the Multics machines had 36.
>
> Pardon my ignorance, but were there any places where the top four bits
> were actually used? I mean, I don't believe there was a machine back
> then capable of running MULTICS and also having more than 8Gb primary
> storage. Wouldn't it be possible to fake it by just chopping off the
> four most-significant bits and using the remaining 32?
It's the virtual addresses you really care about. So
the limit of physical memory is really a diffent issue.
The address was used in 2 18-bit parts. The upper part
was the segment number and the lower the offset into the
segment. That meant segments could be no more the 256K
and you could have no more than 256K of them. Because
there was a one-to-one correspondence between files and
segments, that would have limited files to 256K. They
did some "stuff" to get around that, but I don't think
it's what you'd do if you were starting from scratch, or
maybe even doing a fresh port. If you divided the 32-bit
address into a 14-bit segment number and 18-bit offset,
then you could keep the same segment size and the only
limit would be that a process could use no more than 16K
segments.
All in all, it'd be a whole lot more fun to use a 64-bit
machine and divide it into 32 and 32.
BLS