4 Oct
2001
4 Oct
'01
3:01 p.m.
On October 4, Ethan Dicks wrote:
The ST251-1 is a stepper drive also, believe it or not. They actually
built a stepper positioner that achieved 28.5ms. Back when it was new
I heard something about them having patented it or something.
The ST225 was indeed 65ms...scary slow. It made a great distinctive
"peep-peep" sound, though...which I liked even more than the [still
rather cool] "chirp-chirp" sound of the ST251 and ST251-1. :-)
I believe the first voice-coil drvie in that family was the ST-4096,
but I'm not positive of that. That was one nice drive.
-Dave
--
Dave McGuire
Laurel, MD
I thought that it specifically _was_ the -1. I
_think_ I have a DEC-
badged RD-32 (ST-252-1) from a Pro380 VAX 8530 console, but I might
be mistaken. Maybe they got what they could get in later years.
Probably so.
The ST251 had
an average access time of 40ms (if memory serves) and
the ST251-1 was 28.5ms.
That sounds right. Stepper motor vs. voice coil. (The ST-225 was
something horrible like 65ms or more; I used to think seek-time didn't
matter much on a micro, but when I went from 65ms to 28 on my Amiga,
_wow_!) 
4 Oct
4 Oct
4:57 p.m.
On Thu, 4 Oct 2001, Dave McGuire wrote:
The ST225 was indeed 65ms...scary slow. It made a
great distinctive
"peep-peep" sound, though...which I liked even more than the [still
rather cool] "chirp-chirp" sound of the ST251 and ST251-1. :-)
I *love* that sound. Another good one is the IBM WDA-105. That was a
nice-sounding drive. Another melodic one. Only 5 megs though.
Peace... Sridhar
8 Oct
8 Oct
12:26 p.m.
New subject: old computer sounds
At 12:57 AM 10/5/01 -0400, Absurdly Obtuse wrote:
I *love* that sound. Another good one is the IBM
WDA-105. That was a
nice-sounding drive. Another melodic one. Only 5 megs though.
This weekend in the cheesy Sunday paper magazine there was a story
of an old guy who records the sounds of machines gone by:
trains, trucks, saws, etc.
Is someone out there making recordings of old computers?
I certainly daydreamed about adding sound to an emulator,
so you could hear the clunk-clunk of an eight-inch floppy
drive... I would guess that the recording requirements
might be quite high: some old sounds have some very high,
very low or very quiet components.
For that matter, video recordings of old computers booting
or running a classic program record the elements of *time*
and screen characteristics that may be lost in an emulator
running at 1000x speed on a PC.
- John
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