On Thu Dec 20, 2007 at 02:11 Jim Battle said:
> Rather than a magnetic drum, I think a much more achievable
> contraption
> is a drum that uses capacitance for storage. ...
Ha! Just like the Atanasoff-Berry machine.
Someone else mentioned using a toner drum, but as a smooth surface on
which to put an oxide coating to make it into a magnetic drum. I
wonder how fast one could optically write charge to a toner drum?
Readout could be through capacitive coupling, no contact at all.
I 'spose the antecedent to a disc version of the above would be,
what, a Wimshurst machine? :)
> ...
> It sure isn't going to do 3000 RPM, but perhaps 1/10 of that speed,
> and
> it will make a nice clatter I suppose. But since you are setting a
> limit of 256 transistors, you shouldn't really be aiming for high
> performance anyway.
No, no! The drum is the limiting factor on speed. Fast drum ==
slow computer; slow drum == intolerably slow computer.
-B
-------------- Original message from "Steven Canning" <cannings at earthlink.net>: --------------
> Sridhar,
>
> I have a bunch of the 760s ...? They weigh a ton ! But at least they are
> working. Currently running Windoze 3.1 and DOS mostly to control test
> equipment.
>
> Best regards, Steven
>
>
760's make very good Dumb Terminals. I have 3 here with
Procomm on them. Use them everyday for testing systems.
and recording the sessions. Very nice screens.
The 860 is a Power PC ThinkPad, which is getting hard to
find. They where very expensive in there day.
- Jerry
Jerry Wright
JLC inc
Hi, I am trying to locate the TT manual for the 15E paper winder, any idea
on where to get one ?
Thanks
Bob K6OSM
McCall, Idaho
commtekman at aol.com
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(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
Got a UART? It will make the Kaypro keyboard output into parallel without
changing a thing. The signal's 300 baud RS-232 at TTL levels.
Bob Maxwell
------REPLY------
Hi Bob! Thanks to everyone who replied to my question. They have been very
helpful.
The goal of this project is to interface the Kaypro II serial keyboard to a
Vector Graphic Flashwriter II video board. It requires 8 bits of parallel
input (TTL levels) and a strobe. It provides +5v and ground connections.
The interface is 8 bits of data, 1 strobe line, +5v, and ground connected to
an intel 8212 parallel interface chip.
Does anyone have a schematic for *simple* hardware only circuit using a
commonly available UART, like an 8251 or 8250, to do the serial to parallel
conversion? I am looking for a schematic which I can easily modify to strap
the UART to 300bps operation.
Really, I'd like to stress a *simple* circuit using a small number of chips
and discrete components on a small protoboard. Preferably with +5v only
operation. Even a hand drawn example or one in a datasheet would be great.
I have searched on the internet for a simple circuit but have not found
anything I could use.
Please no MCU's or programmable devices, I realize how appealing they are
but they require learning time consuming programming environments and I am
pressed for time at the moment.
Thanks in advance for any help!
Andrew Lynch
> Three point twenty was the first version that directly supported 720K from
> MICROS~1, although there were a LOT of two point elevens, such as Gavilan
> that were set up by OEMS to do it.
That reminds me--I located a nice black vinyl binder and slipcase
with Grid MS-DOS 3.20 docs and disks in it. Grid did have its own
version of the MODE command as well as a few other utilities. Since
I no longer own a Grid, if anyone wants it (and is willing to pay
shipping), it's up for grabs. Email me off-list if you're
interested.
Cheers,
Chuck
> From: Tom Watson <tsw-cc at johana.com>
>
> Ob Keypunch: Back in the day they had a Control Data Institute ad on TV
> that boasted "Do you like working with your hands and not getting your
> fingernails dirty?", I then remarked that this guy has NEVER replaced a
> keypunch ribbon. (*SIGH*) those days were much more fun!!
I used to tease the CDC CE's with that line when they were digging
bits and pieces of shredded printer ribbon out of a 512 printer type
train (a not infrequent occurrence). If looks could kill...
Cheers,
Chuck
I'm looking for an IBM Thinkpad 701C or 701CS (the one with the
butterfly keyboard), as well as a Thinkpad 860. Anyone have any
available? They have to be working.
Peace... Sridhar
Tue Dec 18, 2007 at 17:32 Gordon JC Pearce said:
> Did any company ever actually produce a storage product that used
> 8-track carts (or indeed broadcast carts)? Did it work?
>
> Gordon
I had a surplus dual 8-track data drive back in the early '80s that
came from a Compucolor machine, ca. 1975. It was fun to play with.
As I recall, it had a 4-track head and two head positions. I managed
to write & read data from it at 2400 baud. I don't know if it would
have worked at a higher data rate, though the manufacturer claimed it
would work at up to 600 cps.
-Bobby
I have an old Xerox memorywriter electronic typewriter that needs to have the membranes inside the keyboard replaced. Does anyone out there know how to replace the membranes? I have two keys that no longer work because of this problem. Thanks.
---------------------------------
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Hi, all:
I'm a newbie to the list, so hello.
I'm trying to fnd out the fair market value of a Burroughs C3660 Electronic Calculator, c/w
manuals, magnetic memory cards, etc.
Can anyone give me their opinion, or point me to a web site which gives market values?
Best Wishes,
Bernie Roche
Toronto, ON, Canada
