I have a mystery S-100 computer that I'm would like to sell, from the
estate of the late Ken Gielow (author of Z80DIS, a great Z80 disassembler).
The proceeds will be donated to a non-tax-deductible magic group Ken was a
long-time member of.
The computer is located in Cupertino, CA (aka "the heart of Silicon
Valley", in the S.F. Bay Area). (If reopened, you can combine a pickup
with a visit to the Computer History Museum in nearby Mountain View, CA! :)
This would likely be quite expensive to ship. I'd guess 30+ pounds.
Photos and some info at:
Some of the hardware (also listed on the above page):
unknown semi-transparent front panel
spare/uninstalled Ithaca Intersystems DPS-1 front panel
10 various boards inside
metal case (heavy)
There may be manuals on some of the boards and/or the Ithaca, but I'm not
sure yet. (They would be included, if they exist.)
I wanted to take photos of each board, but having been seated for about 40
years, they don't come out if I tug gently. None have integrated board
(I tried a boroscope, but could not get useful photos.)
Based on the labels on some EPROMS, there's a chance that it's a homebrew
TRS-80 clone, with both Level II BASIC and CBASIC, and may have Morrow
DISCUS software on it.
We're looking for an offer on either:
- the Ithaca Intersystems front panel;
- the computer with all the boards
Suggestions welcome, thanks!
> From: Gavin Scott
> I think if I had a whole lot of old faded greenbar etc. ... Someone may
> even have done this already
Someone's already done the specialist OCR to deal with faded program listings.
I am trying to locate documentation on the PDP-8 clone built by Canadian company Consolidated Computer Inc (Mers Kutt) in the mid 1970's.
An example exists in the UK and will be restored when more data than just the system can be found.
Rod Smallwood - digital equipment corporation 1975-1985
Would someone please suggest a replacement for the Compaq Portable's
brightness knob? This was missing on mine when I got it.
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
Q: What is the most annoying thing in e-mail?
So now that my pdp8/L is up and running (it now has a serial port and
runs FOCAL69 quite well) I'm thinking about the next step, which is of
course more memory.
This requires a BA08 or BM8/L or something expansion box but to be
honest I have enough spare flip chips and such from the wrecked 8/I to
build about 3 core memory systems. So given that the schematics for the
BA08 are online, they look pretty darn simple, I have the parts, and I
have the parts does anyone know if it's possible to get a flip chip
backplane to work on and wire up to emulate a BA08?
It looks like they just used the data break interface lines to hook up
to the processor. Everything's there, Memory address bus, memory data
bus, and the various signals for jumps and the like that could allow one
to decode and implement the extra instructions needed.
Hm. Might just be easier to build it with an FPGA or something as it's
mostly linking up simple gates and the whole core memory section could
be removed by a 4k*12 memory array. Anyone ever done this?
> Anyway I fully expect it to go ... for a _lot_ more than the opening price.
Much to my surprise, it didn't sell at all (although a number of other lots,
likely from this machine, did.)
I'm rather puzzled that an -11/70 will sell for north of $10K, while a /780
can't fetch $5K. I can only guess that PDP-11'S are seen as more important in
the collector world (even though the BSD work, which had such a huge impact on
UNIX, which has now - in the form of Linux - taken over the world, was
centered on the VAX).
That's after sitting parked a couple months. I have a Dysan doing it too. The Dysan had been re-banded with a boiled 3M band and run for years like that with no shedding. I have another Dysan with a green Plastiband in it which is also fine, minimal/no shed. So, I think we may need to re-evaluate if the clear Amazon cheap "plastibands" are perhaps totally incompatible with tape.
I know, I know..."just use the band to get data off." But I want to *run* QICs without having to destroy them constantly.
I think I may need to replace the two output capacitors in some of my H744
regulators. These are screw terminal 6,000uF 10V parts. I have looked on
Mouser, Farnell and Digikey and there don't seem to be any available, and
any that are listed are really rather costly.
Does anyone know where I might find some, preferably from a reputable
supplier. Note that I am in the UK.
If I can't find 10V rated ones, then, generally up to what sort of voltage
rating can I go? Of course, physical size will be a factor, but electrically
can it affect operation of the regulator if the rated voltage is too high?