We would love tunnel diodes in packaging for our semiconductor? display ay smecc ed#
On Friday, November 15, 2019 charlesmorris800--- via cctalk <charlesmorris800 at centurytel.net; cctalk at classiccmp.org> wrote:
>I've got a bunch of tunnel diodes; never found a practical use for them
for me.
You must not own any older Tektronix scopes then. At one time I had fourteen and there were several tunnel diodes in almost every one (trigger circuits mostly).
And their characteristics do drift with age, sometimes out of the range of adjustment
:)
-Charles
I am the author of tcpser, a UNIX/Windows program that emulates a Hayes
modem.
Some time ago, Chris Osborn (FozzTexx) forked a copy of my project to
fix some bugs and he also added in some parity code, which looks to
strip parity from the incoming serial connection (in the case that the
serial port is set as 8N1 and the computer attached to it sends in 7E1
or similar.
I am working to merge in all of his changes into the mainline codebase,
but I am unclear on prpper Hayes behavior.? His Readme says:
https://github.com/FozzTexx/tcpser/commit/5f0e28bb837463e597a1daf9b3c07e56a…
"I also made the modem routines automatically detect parity and ignore
it in AT commands and print out modem responses in matching
parity. Parity is *not* stripped when sending data over the
connection, which is how a real modem behaves. This may or may not be
what you want. Some servers will expect an 8 bit connection and may
not work."
Did Hayes modem really do that?? I thought most later modems self
detected parity and speed and thus would have switched both the comm on
the serial port and the data sent to the other side in the same parity
(if the terminal was 7E1, the modem would configure as 7E1 and send 7
bit data to the other side.
But, maybe real modems did as Chris notes. Anyone have guidance on
this?? The goal of tcpser is to emulate a Hayes modem as much as
possible, but I never really thought about mismatched parity on the
RS232 line and how to deal with it.
Jim
--
Jim Brain
brain at jbrain.comwww.jbrain.com
>I've got a bunch of tunnel diodes; never found a practical use for them
for me.
You must not own any older Tektronix scopes then. At one time I had fourteen and there were several tunnel diodes in almost every one (trigger circuits mostly).
And their characteristics do drift with age, sometimes out of the range of adjustment
:)
-Charles
I may be stating the obvious here but looking for a little advice and
reassurance from anyone on the list who may have had experience with these
machines.
I have a couple of TI99/4A's that I was given quite a long time ago along
with about 50 software cartridges (if I understand things correctly the
cartridges on their own a quite a bonus). What I am missing are power
supplies. On my research the inputs are 12 and/or 5 volt depending on the
number of power pins on the back (mine have 2).
These voltages appear to neatly align with most PC power supplies so I
should be able to tap into an old AT power supply of which I have quite a
few.
Thank you.
Kevin Parker
> From: Al Kossow
> These showed up on eBay, I'd been looking for them for over twenty years
As in, 'you all shouln't bid on those so I can grab them'? Or do you want
someone here to get them, and send you scans?
If the latter, people should co-coordinate so they aren't bidding against
each other.
Noel
I recently acquired a VAXmate with an LK250 keyboard. The problem is the
keyboard came without the cable. It uses an 8-pin SDL connector and the
usual tiny MMJ-like connector at the keyboard end. I don't know the pinout
and I don't have the necessary crimping tools, is there any source for such
a cable?
Thanks
Rob
With permission, I?m forwarding this email about a Xerox 820-II that?s available in Regina, Saskatchewan, Canada. (I live in Regina, and know Steven.)
Feel free to contact him directly. He?s also available by IRC; email me directly for server details.
Jim
From: Steven Brown [mailto:tuxsteve at gmail.com]
Sent: Wednesday, November 13, 2019 10:01 PM
To: buysell at losurs.org; Q&A LOSURS <q&a at losurs.org>
Subject: [LOSURS: buysell] Xerox 820 PC
My dad worked at Xerox for over 20 years here in Regina. A former co-worker of his called him to see if he knew anyone who might be interested in taking ownership of a Xerox 820 he has.
Still works apparently.
Specs can be found here:
https://oldcomputers.net/xerox-820.html
He sent along the following information:
"
This is a xerox 820 II antique, black & white screen, 8? HD and a dual 8? floppy unit, has the 8 and 16 bit intel processors.
If one was interested in playing with the old stuff.
Tried to give it to Western Development museum but they only want stuff that relates to Saskatchewan.
Oh yes it is a com base operating system
"
He mentioned it comes with a pile of software as well.
Picture sent isn't very good but here it is:
https://imgur.com/a/CzH5FHz
If anyone is interested please let me know. If anybody knows of a person or institution who may be interested, please let me know.
Regards,
Steven Brown
Hi everyone,
I'm planning to expand my MAME-based emulation of Intel MDS-II systems
with the support for double-density floppy disks. In particular, I'm
thinking of emulating the isbc202 floppy controller because its
architecture looks very interesting. This board was based on Intel's own
3000-series bit-slices.
A necessary step for this work is finding the image of the 4
microprogram PROMs on the controller board. Has anyone on this list ever
dumped these memories, please? Can you share the binary images with me?
Of course, I'm going to properly credit you in the emulator sources.
AFAIK this would be the first emulation of a Intel 3000 system.
A side question: do you happen to know if the Intel CROMIS assembler for
3000 series has ever been preserved somewhere on the Net? The manual
says it was provided to user as a set of FORTRAN IV sources.
Thanks in advance for your help.
--F.Ulivi
