" Finding out the data transfer rate
First, you need to find out the data transfer rate (roughly the density:
high, double, single).
For this, you try out fdrawcmd readid 0 rate=x, where x is 0, 1, 2, 3 If
no rate is supplied, fdrawcmd assumes rate=0 "
My question: How do the numbers 0,1,2, and 3 relate to the densities of
high, double, and single? There are 4 numbers and only 2 densities.
> My question: How do the numbers 0,1,2, and 3 relate to the densities of
> high, double, and single? There are 4 numbers and only 2 densities.
dtr-code rate for FM rate for MFM
0 250kb/s 500kb/s
1 150kb/s 300kb/s
2 125kb/s 250kb/s
3 500kb/s 1000kb/s
"Single Density" is MFM, 125 kb/s. "Double Density" and "quad Density"
are MFM, 250 kb/s. "High Density" is MFM at 500kb/s. The 300kb/s rate
(number 1) is used on 8" drives and 1.2Mb 5.25" drives, and the 1000kb/s
rate (number 3) on 2.8Mb drives.
Does anyone know if this has been completed or attempted? Something similar
to what DOS ImageDisk or 22DISK does? I would like to interface my 8"
floppy drives to a modern Linux box for imaging.
Insight is appreciated. Please reply directly as I'm not subscribed to this
mailing list yet.