24 Mar
2010
24 Mar
'10
12:02 a.m.
Fred Cisin wrote:
"720K" is 250K bits per second at 300 RPM
("DD diskettes)
(except for some old Sony drives (ask Tony) which ran at 500K/600RPM)
... Drives which are often found in HP 1650 series logic analysers (e.g.
my 1651B). Ick.
"2.8M" is 1000K bits per second at 300 RPM
("ED" diskettes
(barium-ferrite, vertical? recording))
Perpendicular recording. Different name, same basic thing.
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/