22 Jan
2009
22 Jan
'09
3:52 p.m.
Off the top of my head (I know, dangerous and unreliable), the sector
skewing on my Intel MDS was done in the formatting routine. There was a
skew offset of something like 3, I think. The BIOS/BDOS didn't do any
translation. It was basically done by writing logical sector numbers
onto the disks that were not the same as physical sectors.
Remember that the Intel MDS CP/M was the way it was released from DRI.
Any other OEM could implement theirs differently.
Dave
ROBO5.8 said the following on 1/22/2009 6:30 PM:
Hi,
I'd like to know if CP/M 2.2 is "Zero" biased when it comes to Sector
Translation. Since v2.2 supports Blocking/Deblocking I would assume it has
to be. I've looked at lots of code examples via Google and searched the
documentation but I cannot find a statement to that effect.
Asking it another way: The Sector Translation routine is passed the
requested sector number in Registers B&C. Does CP/M request Sector 0 or 1
when it wants the first sector on any track.
Thanks Robo