14 Feb
2013
14 Feb
'13
2:28 p.m.
On Wed, 13 Feb 2013, James Lynch wrote:
The narrower head/track of the 80 cylidner [1] driveproducese a smaller
signal than that of the 40 cylidner drive. So the interference becomes
relatively larger.
This may also be why some disks work at 40 cylidners nad not at 80. The
read signal is marginal in any case, and when you use narrower tracks,
it';s jsut to osmall for the red amplifier to cope with.
[1] Stricktly, an IBNM PC 360K disk has 80 tracks. 2 in each fo 40
cylinders.
-tony
I changed the software controller parameter on my
Zenith Z-100 to get 96
TPI on the 5.25 inch drives. Simple change, although had to add a thin
metal shield on top of drive because of interference from monitor.
I had to do that when I mounted a full height floppy drive in the "tuner"
space of the TRS80 model 1 monitor. "Mu-metal"
I don't see any reason why it would be different for 40 tracks or 80
tracks on the drive.