9 Apr
1999
9 Apr
'99
3:34 p.m.
On Fri, 9 Apr 1999, Max Eskin wrote:
On Thu, 8 Apr 1999 CLASSICCMP(a)trailing-edge.com
wrote:
The PC (and TRS-80) process all of the disk I/O through a "Floppy disk
controller" chip. Which doesn't permit the stepping weirdities, but does
permit some other ways to deliberately misrecord the disk for copy
protection systems.
I suspect when you say "MFM" you mean
"all the soft-sectored data storage
schemes descended from the original IBM 3740 (FM) standard", in which case
you're right.
So, does that mean that those quarter-track schemes used for
copy
protection on the Apple II could also be implemented on a PC or
Macintosh disk? The reason why I ask is because I've never heard of such a
practice.