Re: Reply to Question???

[dempson@swell.actrix.gen.nz (David Empson)]

In article <Dec2.133729.67603@acs.ucalgary.ca> 
sbdocker@acs.ucalgary.ca (Sean Brendan Dockery) writes:
>
> When you go though GS/OS, the DOS 3.3 FST will read the proper sector.
> Although the standard byte count of a block read through the FST is
> 512, only the first 256 bytes are valid.

Wrong.  The DOS 3.3 FST uses a block size of 256 bytes for all its I/O
requests.  The APPLEDISK5.25 driver supports block sizes of 256 bytes
or 512 bytes.  The DOS 3.3 FST probably has to remap the track/sector
numbers, but the driver takes care of everything else.

If you are doing DRead/DWrite calls to a 5.25" disk from GS/OS, you
can specify the desired block size.

> Utilities like COPY II+ have kludge code to get around this
> limitation, though.

Copy II+ bypasses ProDOS and does the disk access itself, as far as I
know.  It includes its own version of RWTS.
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz                                                
Snail mail: P.O. Box 27-103, Wellington, New Zealand