>
>Subject: Re: Collectables?
> From: Dave Dunfield <dave04a at dunfield.com>
> Date: Sat, 12 Nov 2005 21:40:36 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>>Ah, IMS and IMSAI are not the same people. I have a number of IMS boards
>>and they were also a s100 systems supplier, decent stuff too.
>>
>>IMS Corp. >>> IMS
>>IMS Asoc Inc >>> IMSAI
>
>Ah (he echos) - I hadn't clued into this either, but yes, there are two
>IMSs (confused the heck out of me the first time I ran into IMS (corp.)
>boards) - this makes sense (I also had not heard of IMS (IMSAI) making
>Altair 4-slot backplane boards).
>
>
>>Two different companies. IMS was a bit later time frame and did produce
>>upgrades for Altair. In fact just about everyone produced upgrades of
>>one form or another. Typically backplanes, power supplies, RAM, CPU and
>>of course FDC were often seen. About the only part not commonly upgraded
>>in an Altair was the front pannel though that could be done as well.
>
>Really? I don't recall ever seeing a third-party front panel on an Altair
>(at least not a commercially produced one) - who made one, and are there
>any links to photos anywhere?
>
>Regards,
>Dave
>--
Godbout had one that was hex keyboard and multi digit numeric led diplays
rather than toggle switches. There was also the 8800B FP which was very
different from the A version in implmentation. The 8800 (and A) FP was
a nightmare of oneshots and was wired to the backplane with a bundle of
wires (can you say rinngggg!) plus an wire connection to the CPU card
as well.
Allison
>
>Subject: Re: Collectables?
> From: Scott Stevens <chenmel at earthlink.net>
> Date: Sat, 12 Nov 2005 21:54:08 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>I'm so glad there are people who think differently than me, so I
>can get stuff like that coin for almost nothing.
Yep! The history of many of my systems sorta odd. Many of the key
ones have been with me for years and some are like new but many
are modified, expanded, tweeked and a few I still use on regular
basis as they are known systems. If they have vices, I've known
the specific details for more years than PCs have existed.
Allison
>
>Subject: Re: Collectables?
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Sat, 12 Nov 2005 18:07:56 -0800
> To: cctalk at classiccmp.org
>
>Let me be clear on the IMS backplane--it's not a 12-slot model, but a
>4-slot version. It appears to be factory-engineered this way and a glance
>at the rails in my Altair 8800 appears to say that this was intended for
>incorporation into a MITS box and not the IMS box. Connection is obviously
>the MITS wire-by-wire method, not the IMS edge connector.
>
>I hadn't realized that IMS made add-ons for the MITS boxes, but here you
>have one.
>
>Cheers,
>Chuck
Ah, IMS and IMSAI are not the same people. I have a number of IMS boards
and they were also a s100 systems supplier, decent stuff too.
IMS Corp. >>> IMS
IMS Asoc Inc >>> IMSAI
Two different companies. IMS was a bit later time frame and did produce
upgrades for Altair. In fact just about everyone produced upgrades of
one form or another. Typically backplanes, power supplies, RAM, CPU and
of course FDC were often seen. About the only part not commonly upgraded
in an Altair was the front pannel though that could be done as well.
Allison
>Ah, IMS and IMSAI are not the same people. I have a number of IMS boards
>and they were also a s100 systems supplier, decent stuff too.
>
>IMS Corp. >>> IMS
>IMS Asoc Inc >>> IMSAI
Ah (he echos) - I hadn't clued into this either, but yes, there are two
IMSs (confused the heck out of me the first time I ran into IMS (corp.)
boards) - this makes sense (I also had not heard of IMS (IMSAI) making
Altair 4-slot backplane boards).
>Two different companies. IMS was a bit later time frame and did produce
>upgrades for Altair. In fact just about everyone produced upgrades of
>one form or another. Typically backplanes, power supplies, RAM, CPU and
>of course FDC were often seen. About the only part not commonly upgraded
>in an Altair was the front pannel though that could be done as well.
Really? I don't recall ever seeing a third-party front panel on an Altair
(at least not a commercially produced one) - who made one, and are there
any links to photos anywhere?
Regards,
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
>
>Subject: Collectables?
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Sat, 12 Nov 2005 15:03:55 -0800
> To: cctalk at classiccmp.org
>
>I just found an unused bare S-100 backplane PCB marked "EXP-4 Rev. 2" and
>"(C) 1975, IMS Assoc. Inc.". I'm assuming that it's for the IMSAI 8080,
>but am not certain.
>
>I've also discovered a bare Polymorphic Systems backplane from about the
>same time. I'll throw in the 4 edge connectors that were taped to it. It
>has pads for rectifiers, caps and what looks like a regulator on it.
>
>Let me know if you're interested.
I'm building a small 4 board s100 system, the usual Z80, Memory, IO and disk.
The Polymorphic sounds nice for that project. The IMS is too big if it's
their usual more than 12 slot backplane. I'd take both though depending
on price.
Allison
At 15:03 12/11/2005 -0800, you wrote:
>I just found an unused bare S-100 backplane PCB marked "EXP-4 Rev. 2" and
>"(C) 1975, IMS Assoc. Inc.". I'm assuming that it's for the IMSAI 8080,
>but am not certain.
>
>I've also discovered a bare Polymorphic Systems backplane from about the
>same time. I'll throw in the 4 edge connectors that were taped to it. It
>has pads for rectifiers, caps and what looks like a regulator on it.
>
>Let me know if you're interested.
Hi Chuck,
I have interest in the IMS backplane - I have an IMSAI 8080 front panel,
which I plan to build into a functional machine, and I'd like to use as
many IMS parts as I can find.
Regards,
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
ITS THE MEAT GRINDER!
How many poor CEs got their tie stuck in this?
Ebay number 7561176298.
One of these days I need to get me one of these. Tasty!
William Donzelli
aw288 at osfn.org
I found an old Quadram quadboard in my junk collection. This is a 256K
(41256 DRAM) add in board for the 5150. Also includes a serial port
(8250), a parallel port (8255) and a clock (some small 19-pin OKI chip).
The board bears a copyright of 1982 and the chips have date codes in early
1983, so this is a very early critter.
To my recollection, this was usable only on the 4.77MHz motherboards, but I
could be mistaken. The original "wide" PC mounting bracket has been
replaced with a conventional narrow one, so this board has probably seen
duty in a clone.
I can populate the board with DRAMs if necessary. I think I may even have
a software diskette and manual for it, but I'm not completely certain.
Let me know if you're interested.
Cheers,
Chuck
Hi,
I might have a few, but what exactly are you trying to connect?
Are they the white ones with only the outer two pins used, or the brown ones
with the locking tabs?
Thanks, Paul
>
>Subject: Re: FPGA VAX update, now DIY TTL computers
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Sat, 12 Nov 2005 21:33:43 +0000 (GMT)
> To: cctalk at classiccmp.org
>
>>
>> On 11/11/2005 at 11:12 PM woodelf wrote:
>>
>> >PS. As for getting 7400 off scrap boards, if I had the scrap boards I
>> >would most likely try to get the scrap item working again. :D
>
>Me too. I've got piles of obscure boards that I'd like to get going again
>sometime. Most have no real practical function, but are part of the
>history of computing/electronics.
>
>About the only thing I'll raid for parts are no-name clone PC
>motherboards and cards.. And those are not a good source of standard TTL,
>alas.
>
>>
>> There are plenty of junk boards that have no particular useful function.
>> I've got a bunch of ISA cards that I salvaged. All were old models of a
>> gizmo that appeared to a PC as a monochrome adapter, but which translated
>> the CPU writes to video memory to serial codes to a VT-220 type terminal.
>
>Now that sounds unusual enough to be very interesting. Put it this way,
>if I had something like that I'd be trying to track down a dump of that
>missing ROM. I would not be raiding it for parts.
>
>-tony
There are tons of mostly unidentifyable boards with usable parts or we
know what they are and maybe they even work but heck there's a stack
of 100 in the corner with good parts for salvage.
Examples of salvage to me XT clones that were never rare, 386 and 486
boards with salvageable parts. A sharp TV with a dead red drive from
a doitall chip is junk for stripping. Non-salvage items, things I
keep and fix like my uVAX ADVICE as it's an in circuit emulator for
the uVAX chip so it both maybe the last in existance and unusual.
There is junk and not. The junk is there to make the not junk work.
One can have too much junk, rarely!
Allison
