Boy does that bring back memories. In 1984 I helped convert a shop from a
360 to a 3000 series 44. The 360 had a whole 64k of memory and 7 meg of disk
space I just can't remember what 360/?? it was. It was a very old 360 at the
time the company had it for a long time, and they had bought it used.

Gary

----- Original Message -----
From: "Jeff Kell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 04, 2002 4:21 PM
Subject: Re: [HP3000-L] Powering down a 3000


> Wirt Atmar wrote:
>
> > As a side note, people have a tendency to vastly underrate relays as
logic
> > devices, but you could build an entire computer out of them, CPU,
memory,
> > everything. Clearly, it would be a little slow, awfully big, and very
noisy,
> > but it would work. Indeed, Shannon defined the logic of computers not
around
> > the circuits that we now use but only with these kinds of relays in
mind.
>
> I own an old IBM 360/65 front panel, complete with 4-byte registers of
> lamps.  There are also 4*8 toggle switches so you can "enter" a value.
> The old bugger has a parity bit per byte.  The switches are multi-throw
> of some fashion (haven't torn one apart) but I did have it wired up to
> a healthy 5-volt power supply so you could toggle the register lights
> on and off with the switches.
>
> The "underrated" part is that it computed parity on the bits and the
> parity light would turn on or off automagically.
>
> Jeff
>
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>

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