Here I would like to submit to you a format
that should be useful for many persons in
France.
This is the format of a 80's 8bits computer (TO8)
that have been widely spreaded in schools
10 years ago. Many emulators have been
been writted, specially under Linux.
This format is known to be compatible with PC
floppy drivers (Some applications can handle it
, but only running DOS ).
I have very much experience using theses computers,
and I know nearly everything about TO8 disk drives
(I've disassembled ROM code), but still not enough
to hack the kernel.
So, is there on-line documentation about this, or
any channel discussing about floppies ? ;-)
If you're interrested, here is the complete format.
This is the most common format for Thomson
computers. In order to write a driver very complete,
there is 3,4 variations about it (Ex: 5''1/4 floppies).
3''5 Disk DD (2 faces, double density).
80 Tracks, 16 sectors per track, 256 bytes per sector.
Track Format:
Number Characters Description
of bytes:
12 0x00 Synchro bit
3 0xA1 clk 0x0A Synchro chr
1 0xFE Ident address id
1 - Number of the track
1 - Number of the side
1 - Number of the sector
1 - Sector Lenght
1 - CRC control
22 - Spaces
12 0x00 Synchro bit
3 0xA1 clk 0x0A Synchro chr
1 0xFB Data address id
Sec Len - Data field
2 - CRC
Varies - Spaces.
I can eventually post by mail
technical sheets about it (in both French/English).
floppies formatted whit this format,
and utilities that are running with DOS.
Thank you very much !
--- :) ----------------------
obsidian@citeweb.net
http://obsidian.citeweb.net
ICQ 29825776
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