On Mon, 13 Feb 2012 17:21:22 -0000, "Andrew Mawson"
Eek! What do you have in mind? I can't help you with sourcing either,
but as I cut my programming teeth on PDP-8s with TTY and Facit
raders/punches, I am fascinated to know what you are doing with it.
A wave of nostalgia, as I spent years programming pdp11, some of which
ad teletype interfaces. Some of the old dec dealers may be a ble to help:
Swan Computers used to have a warehouse full of teletypes, paper tape
punches and readers, as well as computers:
Another company is Scottish Data Systems, who used to have a wide variety of
such kit, thugh I haven't dealt with either in 15 years or so.
One thing to note is that the british creed 7b style teleprinters punch
baudot code, while the us teletypes (asr33 etc) use standard ascii, which
is more likely what machine tools would use. Worth checking before diving
in though. A teletype is probably the best bet, as you can punch tape
keyboard, whereas a standalone punch may need a current loop interface
connection to a pc.
If you need any help or more info on this, get in touch via group...
Thanks Chris for that link,
I've been given a mainly working 4070 by a kind reader which I expect to be
able to fix (one channel not punching).
At one time in a moment of rashness in the early 1980's I bought (sight
unseen) the entire off site network equipment of Hoare & Co Govett (became
Datastream), who were stock brokers in the city who started selling
financial information to other brokers via their private network. Turned out
that amongst the many terminals, drum plotters and matrix printers there
were over 100 teletypes, and 80 brand new teletype stands. All the teletypes
had non standard print heads - I became Data Dynamics biggest customer for
replacements heads at one time!!! They are all long gone now - sold in small
display adverts on the back of Practical Wireless long before people had pcs
I remember being out of regular work for almost 2 years during the early
nineties recession. No ebay then, just micromart to buy and sell computer
parts. The company I previousy worked for (Crosfield) gave me half a van
load of dec and other kit and that and other stuff kept me afloat until I
found more work. Much easier now, but methinks it will be tough all over
europe for quite a few years to come. At least, interest rates are low,
which helps mortgage payers a little.
I found the 4070 service manual on bitsavers.org:
Looking at the second page schematic, the solenoids are transistor driven,
but have a fuse per solenoid, so the first thing to check would be the
If the fuse has blown, then the driver transistor may be shorted, which
be easy to fix. I would give it a good clean out before doing any work
and make sure the punch lube instructions are followed. That older kit
like a brick outhouse and should last forever with a bit of maintenance.
The input side looks straight parallel, probably ttl compatable, so you
be able to drive that from a pc printer port with a suitable cable. The
thing then is to format the data from a data file. It should be quite
write a short C program to take care of that, calling bios routines,
msdos, rather than windows, to keep it simple...
Thanks Chris. That pretty well fits in with my expectations at the time
- I told the FD that I thought cheap desktop equipment would in a very
few years render the Mamba and other products unnecessary, but he told
me I was wrong....
Du Pont are largely a chemicals and specialty products maker; the move
into imaging seems to have been driven by one particular senior officer,
and was something of a bad move financially.
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