Discussion of large systems
ard at p850ug1.demon.co.uk
Wed Nov 1 17:09:02 CST 2006
> ard at p850ug1.demon.co.uk (Tony Duell) wrote:
> > I would agree. I haev 3 or 4 pre-1975 Unibus PDP11s, a PDP8/e, a Philips
> > P850 and an HP9830 (along with a couple of 9100Bs, a couple of 9810s and
> > a 9820 if you count those as computers).
> I can forsee a world where computers are being saved, but peripherals
> and special-purpose machines (calculators, industrial controllers,
> sequencers, etc.) are not.
> Well, they aren't computers. And we're all here talking about computers.
As I haev said many times on this list, my main interest is electronics.
Not computing per se. Sure I like computers, but I regard them as being
ingenious digital  electronic systems which happen to be programmable.
 As yet Iv'e not obtained an analogue computer, unless you count some
of the servo systems in my hard drives, which IMHO are dedicated analogue
And so I can see as much beauty and interest in, say, the motor
controller of a plotter as in some CPUs. This is one reason I prefer the
old TTL-built machines -- there is little to investigate when you have a
few large ICs connected together, espeically when you don't have proper
data on them. There's a lot more interest to me in a few boads of simple
ICs -- gates, flip-flops, and the like -- which I can understand and
watch the signals on the inputs and outputs.
So yes, I collect peripherals, calculators, odd bits of control systems
 and so on. And of course processors
 I haev part (most?) of the control system from some kind of Xray
defraction system (no, I don't have the 'optics'). It's patchboard
programmable, uses DM160s as status indicators, etc. The papertape I/O
uses the punch and reader from a fride flexowriter, mounted on 19" rack
panels, and with their own motors. The printer is based on a Victor
Comptometer adding machine with solenoids over the keys. I am not sure
I'll ever use it, but it seemed worth rescuing...
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