I have a SparcServer 470 available in south-central PA. It's full of
cards and looks complete. Powers up, but I haven't tested it further.
I'd like to trade it for Apple or DEC equipment, maybe money, or the
stuff listed here: <http://www.applefritter.com/other/wanted.html>.
Also available: SparcServer 690MP rackmount chassis w/power supply. Free.
Tom
Applefritter
www.applefritter.com
>The device pictured in the auction is not a 110 baud terminal.
>It's a 45.5/50 baud TTY device, designed for deaf persons
>(is that the current politically correct term?) to communicate
>with other TTY-equipped parties via telephone.
I thought it looked amazingly like the TTY device my brother has. I just
didn't want to speak up and show my ignorance (I'll do it now when I can
point the finger at someone else as say "he said it first")
-chris
<http://www.mythtech.net>
Was it here that I was reading about turning a RadioShack Desoldering
Iron into an SMT hot air tool? The basic gist is that you remove the
rubber bulb, plug in an aquarium pump on a long-enough air hose, and
pack some (stainless) steel wool inside the de-soldering nozzle. The
pump provides continuous air over the steel wool which facilitates
heat transfer to get the air temp up to something useful. I have
used $800 commercial versions of this at work with great effect.
I have done some initial digging and have come up with the following:
RS De-soldering Tool - $10 new
Weller De-soldering Attachment - in junk box
Aquarium Pump - $7 - $70 new
So... I can use one of my Wellers as the heat source, or I can drop $10
for a dedicated (non-temp-controlled) unit. What I'm hung up on is that
I have no idea what capacity pump to buy. The $70 pump is somewhat large,
but is adjustable. The $7 pump is too small to enclose a golf ball.
There are numerous models in-between, including several with dual taps.
So... has anyone here had any experience building such things? If I
didn't read about it here, I'm baffled where else I would have run
across the info.
Thanks,
-ethan
The New Yahoo! Search - Faster. Easier. Bingo.
http://search.yahoo.com
A friend of mine, Marcus (mlivius(a)charter.net) has a Commodore 128 he is
willing to part with for shipping (and maybe a few extra bucks). It is
still in the original packaging but doesn't come with documentation (in
fact, he says it has rarely, if ever, been used). If anyone is interested,
please contact him direct (mlivius(a)charter.net) to work out the details of
shipping from Houston, Texas.
-spc
Anyone interested in a Compaq DeskPro 2? Reply to original sender.
Reply-to: <WebMaster(a)soberbikersunited.org>
---------- Forwarded message ----------
Date: Thu, 22 May 2003 08:10:57 -0500
From: Web Master <WebMaster(a)soberbikersunited.org>
To: Vintage Computer Festival <vcf(a)siconic.com>
Subject: Re: Compaq DeskPro 2
At 09:51 PM 5/21/2003 -0700, you wrote:
>On Wed, 21 May 2003, Web Master wrote:
>
> > Do you have use for a Compaq DeskPro Model 2? Model 1, 2, and 3 were
> > versions of the first "DeskPro" personal computer. Mid 1980's.
>
>Hi there.
>
>Maybe...where is it located?
Oshkosh, Wisconsin
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com *
Ugh... this tape drive is going to be the death of me!
Now that I have a small supply of Maxell tapes for my TEAC MT-2ST/N50
cassette drive (thanks Don!!!), I've run into the next problem.
All the tapes are reported as "content unknown", and claim to be 60 MB
(the drive claims to do 150 or 160 depending on which info you pay
attention to). Neither of those are too big of a surprise as the tapes
are used, and logically have data that Retrospect on the Mac can't
understand, and may very well have been written to last with an earlier
version of the drive (different models support different MB's, and from
what I can tell, the tapes are all interchangable for writing at max MB,
and upwards readable so you can read a lower MB tape on a higher MB drive)
However, all the tapes ALSO report that they are locked. Regardless of
how I set the write protect slide, the tape is still seen as locked.
Which means I can't erase or write to the tapes.
I opened the drive, and the write protect sense switch appears to be
physically functional. I have not yet broken down the drive enough to see
if it is electronically functional (although about the best I can do is
test for switch continuity in the open and closed positions).
I'm wondering, is it possible they are seen as locked because of the data
on them? Is there a way to software lock the tapes? Or maybe the locked
is a side effect of having been last written at a lower MB (some kind of
a safety to keep you from screwing up the data with a higher MB drive).
If so, is it safe to bulk erase the tapes to wipe the data, or will I
destroy some kind of a control track as well and render the tape useless?
I know some kinds of media should not be bulk erased for just that
reason. I would just give it a go, but since I only have 10 tapes, and
these have proven a bit tough to locate, I don't want to destroy a tape
without at least consulting the resident group of experts.
TIA
-chris
<http://www.mythtech.net>
>From: "ben franchuk" <bfranchuk(a)jetnet.ab.ca>
>
>Dwight K. Elvey wrote:
>
>>
>> Hi
>> All make the assumption that you must make 8 bit/16bit
>> or, in your case, 20 bit. One can make a 1 bit alu that
>> can have data width controlled by instruction. It may
>> not be fast at math but much processor time is consumed
>> just looking at true/false. If your model doesn't require
>> passing data through the alu for mem/mem and mem/io moves,
>> a single bitter makes sense.
>> ( My Nicolet is a 20 bit machine. )
>
>Darn! All the good computer names are taken. :)
>Do you have any more information?
>
>> Dwight
>
>Some day I would like to see a DECIMAL computer in
>TLL or FPGA like the early decimal machines.
>Ben.
Hi Ben
I didn't build it, I just made it work. A real pain,
since I didn't have any schematics and it had several
problems. There are a couple of pictures at:
http://www.rdrop.com/~jimw/jcgm-vcfiv.shtml
Look down 8 rows. The first 2 pictures in that row
are my Nicolet machine ( It has 12Kx20 core ). It is
all ttl/dtl, thought. Notice the front panel switch
position. It is 7600 octal, the boot vector in core.
One of the interesting things is the ALU. It has a
5 input port adder. One can select from, ALU, ALU*, MEM,
MEM* and "one" to add together. One can do a lot with
this combination.
Anyway, back on the original subject, there are also
some interesting minimal instruction processors described
out there. As I recall, there was one that had only 4
operations. SUBtract was one of them ( considered more
important than an ADD ).
I've been toying with making a single bit relay based
computer. My intent is to make the main memory bank using
reed relays with a magnet to bias them. The idea is that
the external magnet has just enough effect that if the
reed relay is closed, it stays that way. If it is opened
it stays open. One would arrange these relays in an array
with small ceramic magnets, north and south poles alternating
so that there is no cumulative bias. Writing to the reeds,
coil in opposite directions causes it to open or close.
Data is handled by a shift register so that the bus is
always 1 bit wide. It'll be slow but what the heck.
To make things a little more complicated, I expect to use
3 phase clocking. With this, I can use overlapped clocks,
without racing.
Dwight
I wrote:
>> I'm looking for DEC DSSI cabling, terminators, etc. I'm located
>> in the Boston suburbs, but will happily pay shipping.
John Allain responded:
> mini-IDC based or mini-centronics based?
Er, yes. ;^) I've got to go from uVAX 3400 and VAX 4k500 bulkheads (and
KFQSA) to each other and some HSD05/HSD10. The HSD's use micro-DB50 sized
connector that looks like a Centronics, while the uVAX 3400 (and I assume
the 4k500) have what looks like an inverted micro-DB50 connector (male on
host).
I never used DSSI machines in production, so I'm very unclear what these
cables are or look like...
Thanks,
--Steve.
smj(at)spamfree.crash.com (lose spamfree to get through, m'kay?)
