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Re: Hardware musings



BLuRry wrote:
So what else would it take to capture these oddly formatted disks?

It would take a program to read the disk and write the data back out in as a file or 'disk image'. The 'disk image' file needs to contain all the stuff suggested in a number of previous posts. Currently there are no formats that would allow you to hold it all. I suggested aa new format and a new naming convention.

Are you familiar with 'SST' or 'Saltines Super Transcopy'? It allowed one to transfer a bit copy image over a modem and reconstruct it at the other end. (Multi step process for computers of the time.) SST was an ovelay hack of EDD to borrow it's routines to read the bit image and save the data to a standard disk for transfer. At the other end SST could read the transferred disk and recreate the track bit image and write it back out.

Some source code from a bit copy program may be a good starting place for the read and analyze routine. SST may even be a better starting point as it dumps the raw data. (Capture bit stream and mark the synchronization point, dump the information.)

If you want A2 disk image of the SST source code, look here:
http://www.applelinc.org/files/SSTHack/

If you want the scanned EDD source code look here:
http://www.apple2info.net/hardware/edd/edd.htm

Thankx,
Ed