--------------Original Message------------------
Date: Fri, 17 Jan 2003 16:27:36 -0500 (EST)
From: liste(a)artware.qc.ca
Subject: Looking for : Sharp PC-1405
Or equiv (Tandy had them as PC-2 or something, iirc).
The goal of my classic collection is to get one of every computer I've
programmed over the years. One of the first computers I programmed was a
PC-1405 (actually, I can't remember the exact model).
I found one of these in a pawn shop. By brother "stole" it. I found
another. This was my one classic computer that was helluva useful. So
useful I took it with my places. And, well, I've just lost it. I've
checked eBay and there are a few Sharp Pocket Computers, but W@W L@@K @
T3H PR1C3Z! Buy it now for "only" 300 USD!
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=3000156764&category=15030
So, does anyone here have one they don't need and/or would be willing to
let go for a reasonable price?
-Philip
--------------------------------------
I've got a PC-1421 Financial Computer if you (or anybody) are interested:
76 character keyboard
16 character display
40K ROM Basic
4.2 Kb RAM
Interface for optional CE-126 Printer/Cassette (don't have)
6 modes:
Normal calculator
Financial calculator
Statistical calculator
Basic program mode
Basic run mode
Almost new, in box with cover & 280P manual. Make me an offer (less than
US$ 300, or even CDN$ 300 :).
mike
I'm working with an old data sample (ca. 1979) to a piece of
equipment that I do not have access to. I've identified some bits
and pieces of code and am trying to identify the processor.
Here's what I know. The processor is big-endian and appears to be
byte-addressable. The opcode for CALL appears to be D3 xx xx, where
xxxx is the address of the destination. 2C appears to be load
immediate instruction and is also 3 bytes long.
The code doesn't look tight enough to be a p-code implementation of
any sort.
Does this ring any bells to anyone?
--Chuck
Last weekend I promised to enable rsync access to the archives
(and mirrors) here.
I've set up the following rsync (no password required) archive sets here:
ftp : Public rsync access to ftp://ftp.trailing-edge.com/ area
pdp-10-tape-images : public rsync access to the PDP-10 tape images,
i.e. http://pdp-10.trailing-edge.com/
bitsavers-mirror : public rsync access to my local bitsavers mirror,
i.e. http://bitsavers.trailing-edge.com/
Suggested rsync commands would be, for example:
mkdir ./pdp-10-tape-images
rsync -rlptu -v www.trailing-edge.com::pdp-10-tape-images ./pdp-10-tape-images
mkdir ./ftp.trailing-edge.com
rsync -rlptu -v www.trailing-edge.com::ftp ./ftp.trailing-edge.com
mkdir ./bitsavers-mirror
rsync -rlptu -v www.trailing-edge.com::bitsavers-mirror ./bitsavers-mirror
Realistically the pdp-10-tape-images and ftp sites don't change often,
butm my bitsavers mirror is kept up to date.
I like to think my outgoing bandwidth (20 Mbit) is pretty much infinite,
this looks like a good way to find out :-)
ftp racks up to 3.5 Gbytes. PDP-10 tapes racks up to 2.2 Gbytes. And
bitsavers-mirror racks up to 126 Gbytes.
Tim.
Just a reminder - this Saturday, just a few days away, RCS will be
doing triage on our big pile of VT100s and VT100oids. We need the
space! Incoming Cray!
Failed VTs will be available for pickup at our open house in
Providence, RI (see rcsri.org for directions). I may be able to move a
few to the MIT Flea on Sunday.
And of course, cash donations are very much appreciated, but not
required. But appreciated. Really appreciated...
--
Will
I cannot find the original price on the unit so I cannot compare.
I went to the wayback machine looking for the pricing and all the pages list "sold out"
The seller should be happy I found this and posted. Someone should be interested.
I myself am saving for a Mimeo from Willegal
The 8/L, ASR33, DF32 disk emulator project has been sold. Thanks
for all your interest (and offers). Anyone who wants the DF32
emulator schematic and artwork, I can email you a copy. I hope
someone can take my "first draft" and make a useful unit for those
who are interested.
I have a working ADM-3A that I may want to sell also. It has a
homebrewed lower-case 2716 ROM (thanks Steve Loboyko for the font
files). I installed the "optional" parts for current loop on the
main PCB, and used it with the 8/L. The only thing that's missing
is the little aluminum panel covering the dip switches.
Any interest? Same deal as before, please email offers, "sealed
bids".
thanks
Charles
Hoping someone from the list can help, I'm trying to track down a
Northern Telecom DisplayPhone for the archive.
http://dxiconsulting.com/images/northern%20telecom%20displayphone%20circa%2…
Actually had one years ago as a kid, and what I used for BBS'ing in
the early 80's. So it holds sentimental value besides archival.
--
Marty
I have a friend that needs this set up to test some Hard Drives
and get his system going. Anyone out there that have a Floppy
that they could image with image disk and send me.
Thanks, Jerry
Jerry Wright
JLC inc
g-wright at att.net
My Altair 680 has achieved the position of primary attention on
my workbench. All of the ICs are socketed. Not having seen
power in over 20 years, I did not trust the power supply as far
as I could throw a bus. I pulled all of the ICs, attached dummy
loads (automobile bulbs) and powered up. Sure enough, there was
AC all over the place (where there should have been DC). I
replaced all of the electrolytic caps and that got rid of the AC
but some of the voltage levels are very wrong, at least as compared
to what is written on the schematics. The worst offender is just
off the "plus" side of the full wave bridge (BR-1). It should be
nine volts but is actually at 11.5. This makes what should be the
main five volt rail a little more than 9 volts... the far side of
VR-1 (a 7805). The wave form coming off the transformer is really
ugly not a smooth sine wave. I hate power supplies. I don't really
understand, looking at the schematics, what this transformer should
be doing. My guess is that it should be making a nice nine volt,
60 cycle AC sine wave with each of the two outputs 90 degrees out
of sync? What could be wrong with a transformer that it would
produce something like:
__
/ \
| \
/ \_
/ \
| /
| /
\_/
bent and very squared off at spots? My scope shows nice clean 120
coming into the transformer. How do I figure out a part number for
a replacement transformer?
Thanks!
Hi.
I try to get my "new" PDP-11/34a back to live. I did a quick PSU test
today with dummy loads. All voltages, LTCL, DCLO and ACLO where OK so I
pluged in the logic boards. But the machine does not respond to the
knobs on the programmers console. Pressing HLT + CNTRL brings the
machine not to halt, but the "Bus Error" LED of the console lights up.
Grant continuity cards and NPR jumpers are in place.
It looks like I have the wrong bus terminator: There is a M9301-YF at
the CPU side and a M930 at the other bus end. It seems I need a M9302
in place of the M930? This would explain the bus error.
I took my scope to have a look at the ripple of the voltages.
Here is what I got on the second +5 V PSU:
X = 0.2 V / div ; Y = 2 ms / div
http://www.unixag-kl.fh-kl.de/~jkunz/tmp/5_Volt_Ripple__y=0.2V__x=2ms.jpg
X = 0.2 V / div ; Y = 10 us / div
http://www.unixag-kl.fh-kl.de/~jkunz/tmp/5_Volt_Ripple__y=0.2V__x=10us.jpg
I get similar pictures on all voltages. Both +5 V power bricks (H7441)
show similar ripple as well as +15 V and -15 V.
There are spikes with up to 1.2 Vpp and it is clearly related to the
50 Hz lines frequency. This doesn't look that healthy. I had a look at
the BA11-K power distribution schematic. The two +5 V PSUs are
independent and run of different windings of the mains transformer.
I am a bit surprised to see about the same fault on all PSUs. I am no
SM-PSU expert, so I am now at the point where I have to ask for advice.
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}
