There is a lot of 5 Addmaster paper tape readers (new in box) for sale on
eBay. No bids yet, ends April 9th.
Item number: 7505437498
I would buy one but I don't need five of them. These look like the ones Data
I/O uses to use for the PROM programmers.
Michael Holley
>
>Subject: Re: small valves
> From: "Dwight K. Elvey" <dwight.elvey at amd.com>
> Date: Mon, 25 Apr 2005 09:57:08 -0700 (PDT)
> To: cctalk at classiccmp.org
>Hi Stan
> I've done similar. I've taken one of those small 100W
>inverters and rewound the transformer on it to provide
>all the voltages for my older battery powered Atwater
>set. It just runs from a 12 volt gel cell. I tapped
>of the primary to provide the filament voltage and
>used the secondary with tape to provide the rest.
>As I recall, there was one -C and two +B voltages.
>I used no regulation, just used the right rinding
>ratios. One has to remember, these old radios
>were made to run form carbon-zinc cell in most cases.
>I did put a pot on my C cell. The original was -4.5v
>but I found that it works better, with less distortion,
>when set at about -3.5v.
>Dwight
Good approach. I enjoy building and winding my own cores
be they EI iron or powered iron/ferrite types is part of
that. Switching mode PS design is an art in itself. Part
of the fun is building for good efficientcy and for powering
tube designs that means knowing the load.
An aside is don't run regens off inverter or switching supplies
as the gain is high enough to negate reasonable shielding
and bypassing. For that I find common alkaline 9V batteries
in series do well for the typical 27-90v range and exhibit
good life.
Allison
Is there any difference in the cartridges for
an RK05F drive vs. an RK05J (or plain RK05)?
I just acquired an RK05F and am getting ready
to hook it up to my system along with my RK05J
drives so I can test it out. I know the pack
holds twice as much data as the RK05/RK05J, but
is there any physical difference in the packs?
I suppose I'll have to reconfigure my existing
RK05J drives so that the RK05F is either drives
0/1 or 2/3 (or 4/5).
Thanks,
Ashley
Hello Gents & Ladies,
anyone here know anything about the physical dimensions of
UNIBUS and Q-BUS boards? I'd like to know, that's all.
Thank you for your time and efforts.
/Ulf Andersson
Classic Computing Wannabe :)
Contemporary Computing Is ;)
Hi,
has anyone tried to write a paper tape emulator in BASIC? I've had a go in
GW-BASIC, but I suspect that the implementation of the language is too slow
to reliably drive the serial port - it doesn't always pick up the paper
advance signal (I've tried using both CTS and DCD as inputs).
Will I have to go to a machine code routine to get the fast port access?
I look forward to replies.
Jim.
Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK
On Apr 28 2005, 16:58, Brad Parker wrote:
>
> "Rick Bensene" wrote:
> ...
> >- A full set of drive select (0-3) plugs for RL01/RL02 drives
>
> Heh. I could use a "0" myself.
>
> What does one do when one only has a "1"?
>
> it works, but i'd like a 0. can I make one out of something else?
Look at the fingers on the "1" plug. The protruding finger on each
side has two edges which can be long or short, but one of those is just
used to tell the drive there's a valid plug inserted. A matchstick
makes an effective substitute :-)
A zero has short edges on upper and lower left, short on upper right,
intermediate on lower right (that last one is the "valid plug" finger).
A one has short edges on upper and lower left, long on upper right,
intermediate on lower right.
A two has short on upper left, long on lower left, short on upper
right, intermediate on lower right.
A three has short on upper left, long on lower left, long on upper
right, intermediate on lower right.
ISTR that when I made my own perspex plugs, before I had real ones
(other than a "zero"), I found there was no real difference between
"short" and "intermediate" -- "short" doesn't move a contact, "long" or
"intermediate" does.
--
Pete Peter Turnbull
Network Manager
University of York
>> <http://www.gcn.com/17_17/news/33727-1.html>
>
>Another myth.
>
>What happened was the _application_, not Windows, had a flaw (a divide by
>zero bug).
Read the bottom of the article, where they state that numerous other
software failures on the Yorktown are associated with using Win NT.
I think the real lesson here is, don't let any computer be your sole
method of controlling a warship... didn't these people watch
Terminator?!? :-)
-chris
<http://www.mythtech.net>
I am trying to decide what to do with a bunch of 16-bit ISA IDE/Floppy
controller, etc. cards. Is there still a use for them, or should I just
add (most of) them to the (rapidly growing) scrap reclaim box? What
about 8-bit and/or 16-bit ethernet cards, no-name 8-bit serial/parallel
cards, older style floppy disk cables that still support the 5 1/4"
floppy drives? Maybe a better question; are they any cards worth saving?
I am keeping all the disk controller cards, memory expansion cards, and
any specialized cards. Are they any Apple IIx cards worth saving? My
general rule there has been that if I have the docs, they are worth
saving.
I have boxes of this stuff spread around and am looking for some
guidelines on what might be worth keeping! I am getting to the point
that anything past about 1984 or so goes.
