20 Sep
2015
20 Sep
'15
4:21 p.m.
On 09/20/2015 03:03 PM, Fred Cisin wrote:
On Sun, 20 Sep 2015, ben wrote:
There was a good reason for that.
Many early disk controllers did not have a "write index to index"
fucntion that also enabled writing special (i.e. missing clocks)
characters. As a result, one had to purchase 8" floppies pre-formatted
(this actually persisted for quite some time). IBM 3740 format was the
most common format out there; hence the easiest to obtain.
--Chuck
I was just digging in to old CP/M a bit and it
was/is tied mostly
to the IBM 8" standard floppy and the floppy interface used at the
time. Even that gave a very small amount memory per track. Ben.
single sided FM/SD 77 tracks, 26 sectors per track, 128 bytes per
sector 256,256 bytes (250.25K)