Re: DOS 3.3 Nibble Encoding

[sbdocker@acs.ucalgary.ca (Sean Brendan Dockery)]

In article <CGMyBJ.1nM@actrix.gen.nz> dempson@swell.actrix.gen.nz
(David Empson) writes:

| > My question refers to the fact that the disk controller ROM won't be
| > able to decode DOS 3.2.1 and DOS 3.3 formatted disks in the same
| > manner as they use different encoding schemes.
| 
| A "dual boot" disk is one that will boot on either a 16-sector or
| 13-sector Disk ][ interface card.  The entire disk is in 13-sector
| format, apart from track zero, which has 12 or 11 sectors in 13-sector
| format (numbered 0-11) and one sector in 16-sector format (numbered
| 0).  The two instances of "sector 0" are distinguished by their
| address marks, the third byte of which differs.

Eureka!  <as I jump from my tub and run naked through the streets>

That was The Missing Link(tm).

| dempson@swell.actrix.gen.nz                                                

Sheesh!  Is there anything that this guy doesn't know?  :-)
-- 
Sean Dockery

dockery@griffin.cuc.ab.ca
sbdocker@acs.ucalgary.ca