19 Jun
2010
19 Jun
'10
4:50 p.m.
On Saturday, June 19, 2010, Fred Cisin wrote:
On Sat, 19 Jun 2010, Patrick Finnegan wrote:
Not sure what "drivetec" is, but the drive I used was an IBM "2.4MB"
floppy drive. I guess I didn't make that clear in my message. The
"2.4MB" drive read 1.2MB floppies just fine on the Catweasel, but the
2.4MB floppies (which read ok as microcode floppies) didn't produce
useful results.
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!
Yeah, when I get some free time, I'll think about it. I was mostly
wondering if anyone here had been successful at reading/writing one of
these outside of IBM or outside of an IBM mainframe device with one of
the drives.
Pat
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