An historical nit about FDDs
elson at pico-systems.com
Sat Jul 14 10:50:55 CDT 2018
On 07/14/2018 07:57 AM, Noel Chiappa via cctalk wrote:
> > From: Jon Elson
> > I THINK the 370/145 used the same drive.
> The "IBM's 360 and Early 370 Systems" book doesn't say so explicitly (it just
> says Minnow - the one with the solenoids - was a"incorporated in .. the
> System/370 processors", pg. 517), but given that the follow-on drive
> (Figaro/Igar) didn't start shipping until 1973 (pg. 519), and the /145 started
> shipping in 1971, it pretty much had to have had a Minnow.
Well, there were two major variants of the 370/145, that had
major changes at least to the power system.
The first version had many small power regulator modules,
the later had two HUGE regulators (390 A each, at +1.25 V
and -3 V). So, they could have updated a bunch of other
features at the time of that change.
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