19 Jun
2010
19 Jun
'10
4:15 p.m.
On Sat, 19 Jun 2010, Patrick Finnegan wrote:
Speaking of weird disk formats...
Has anyone managed to read an IBM "2.4MB" 5.25" floppy, such as those
used for microcode for 3174 terminal controllers and other mainframe
bits? Hooking a drive up to a catweasel, and throwing a 2.4MB disk in
the drive never managed to produce anything useful for me (though I
think I could read DSHD "1.2MB" disks in it just fine that way.
Do you have access to a "Drivetec" drive?
Hang a scope on it. It is likely to be at 1000K bits per second.
IF a normal drive will work with it, you still need to change the
controller to the higher speed, OR slow down a 1.2M drive to 180 RPM.
If you can find one, Weltec made a 180RPM 1.2M 5.25" drive!