1 Feb
2014
1 Feb
'14
11:19 a.m.
On 02/01/2014 08:49 AM, Jules Richardson wrote:
Anyone have any theories as to what the problem might
be? Maybe the FDC
in the machine just plain doesn't support 250k/s transfer rates
(unfortunately I don't have any 3.5" DD media to test that by formatting
a disk in a 3.5" HD drive) - but that would seem like a weird feature to
abandon?
Do you own a piece of opaque tape? Tape over 3.5" the media indicator
hole and you have a DSDD floppy that's good enough for testing.
If that works to create a "720K" floppy then you can try setting your
5.25' HD drive to operate in dual-speed mode (i.e. 360 RPM at high
density and 300 RPM at low density). Recall that density switching on a
5.25" HD drive also requires that a signal on pin 2 of the drive
connector be present, so be prepared to furnish one if it's not present
on the interface.
--Chuck