Re: Q: Transfering Disk Images using Tape Output

[Ron Kneusel <rkneusel@mcw.edu>]

cnetto@softdes.com.br wrote:
> 2) Is there a disk image format without those bits but only with the
> acctual data 

Not that I know of.  But modifying your existing program to send all
the blocks of a disk, regardless of size, through the cassette port 
would be easy to do.  Use the ProDOS READBLOCK MLI routine.  Then, you
need to find a way to extract the bits from the WAV file on the PC.  Look
at the ROM monitor routines to see how they interpret a cassette file
as a series of bytes.  Experiment, you might be able to use a fairly slow
sampling rate and still be able to read the data.

Oh, the only thing to be aware of with a disk image is the order in
which the data is written to the image file.  A ProDOS order (.po) image
is made by simply writing out all the blocks from 0 through 279 in order.
A DOS 3.3 (.dsk) order image is made by writing out all the tracks and
sectors:  FOR I=0 TO 34:FOR J=0 TO 15: output track I, sector J: NEXT J,I
You can also use ProDOS MLI routines to make DOS 3.3 order images with
some switching of data in memory.  DSK2FILE works this way.  See here:

http://net-24-42.dhcp.mcw.edu/dsk2file.html

Source code is included. (Forth)

A good idea, good luck!  If you do get it working you will have added
another useful tool to the Apple II toolbox!

Ron Kneusel
rkneusel@mcw.edu