1 Feb
2014
1 Feb
'14
12:30 p.m.
On 02/01/2014 01:19 PM, Chuck Guzis wrote:
On 02/01/2014 08:49 AM, Jules Richardson wrote:
Yes, good point :)
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).
Can do - is the aim then to set the drive (according to software) to be a
DD drive (which will then use a 250k rate), just to see if it works against
this particular FDC? Recall that I don't seem to have any particular
problems writing DD media in the HD drive as it stands - I just don't
expect it to necessarily be reliable when subsequently used in a machine
with a DD drive. It's just the use of a DD drive on the modern PC which is
causing trouble for some reason.
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.
Yes, not sure in this case - although I can see where pin 2 of the
connector hooks up to an IC on the HD drive, so I can see if it's doing
anything easily enough.
cheers
Jules