----- Original Message -----
From: Si Owen <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: 29. zárí 1999 18:05
Subject: RE: SAD Disk format?
> Si Cooke wrote:
> > By the way... does anyone have any documentation on the SAD format?
>
> Never seen an official spec either, but here's what I use:
>
>
> #define SAD_SIGNATURE "Aley's disk backup"
>
> // Format of a SAD image header (22 bytes)
> typedef struct
> {
> BYTE abSignature[sizeof SAD_SIGNATURE - 1];
>
> BYTE bSides; // Number of sides on the disk
> BYTE bTracks; // Number of tracks per side
> BYTE bSectors; // Number of sectors per track
> BYTE bSectorSizeDiv64; // Sector size divided by 64
> }
> SAD_HEADER;
>
> Followed by actual data: side 0 track 0, side 0 track 1, side 0 track 2,
> etc. So data for the second side of the disk (if any) is slightly more
than
> halfway through the image file. DSK images (as well as lacking the
header)
> interleave the tracks instead, giving: side 0 track 0, side 1 track 0,
> side 0, track 1, etc.
>
> SAD version 2 is just the same but gzipped up.
>
> Si
100% Right.
SAD is properly handled by SimCoupe, and 2sad.
And source code is the specification:
fdi.c from SimCoupe, 2sad.cpp from 2sad.
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