3 Aug
2005
3 Aug
'05
7:12 p.m.
On Wed, 3 Aug 2005, Allison wrote:
Yes, there were always interesting quirks in disk formats!
>> Dave, your on track. The CHRN vlaues do not
have to corrospond
>> to actual head or cylinder. They do not even have to be in order
>> on the media! The only limits on them are R must be 1 or greater
>> (less than 255).
>
>Which creates some complications with handling 128 byte sectors (R==0).
Sorry, TYPO. I got sloppy and thought that you were saying the sector
size value could not be 0
???! The value for R must be a valid sector number.
For floppies
that is never zero.
There are a lot of floppies with sector numbers starting with
0.
765 can read them and write them.
Easily handled
by 765, but not by Int13h.
;-) Plays havoc with many systems not expecting it.
that really bothered people for some reason.
One more line of code.