Mailinglist Archive: opensuse (4020 mails)

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Re: [SLE] new v9.2 is out-terminal question
  • From: Allen <gorebofh@xxxxxxxxxxx>
  • Date: Tue, 26 Oct 2004 16:59:22 -0400
  • Message-id: <20041026205922.GB9084@xxxxxxxxxxxxxxxxxxxxxxxxx>
On Tue, Oct 26, 2004 at 10:54:13AM -0400, James Knott wrote:
> Richard wrote:
> >On Monday 25 October 2004 05:32 pm, Bruce Marshall wrote:
> >
> >>My first computer experience was with a IBM 650. The memory was on a
> >>rotating belt-driven drum. Sometimes with a power spike, the belt
> >>would snap..... :-)
> >
> >
> >Didja ever see what happens to a 6 foot drum with fixed heads when there
> >is a sudden phase reversal? The drum, rotating at 3600 rpm, stops in a
> >fraction of a rotation as it slams into the heads.
> >
> >I doubt if many here have ever heard of, much less worked on a serial drum
> >machine using ac logic. That was the first Process Control Computer, a
> >RW/BR-300 invented around 1957 and still controlling the original process
> >at the Texaco refinery when I left the company in 1973. You had to speak
> >machine language on that one, assembly came later.
> >ra
> I used to work on a system that used a memory drum. It was from a
> company called "Teleregister". It was built with vacuum tubes and
> relays, and was installed in the old Toronto Stock Exchange a year
> before I was born. On this drum, the heads were fixed in position (we
> used to use a piece of paper as a feeler gauge, to adjust the head gap),
> so there was no danger of a crash. This "computer" had hard wired
> programming. If you want to make a change, you had to program it, using
> wire cutters and soldering iron! Another system I occasionally worked
> on years later (Phillips DS-714) had a drum, with an interesting
> feature. The drum was slightly tapered and when powered up, would
> gradually rise, as it's speed increased, until it was close enough to
> the heads. If the power died, the drum would slowly drop, as it slowed,
> protecting the heads from a crash.

Dude that's awesome!!! I've never even seen a machine where you had too do
that !

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