RE: PET disk drive interface

ruud.baltissen_at_abp.nl
Date: 2002-11-25 12:17:35

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Hallo Spiro,

> The 1541 and the 2031 layout differ in the length of bytes
> between end of header and start of sync of the data.

There is nothing between end of header and start of sync of the data: the
bytes between the end of the header and the start of the data ARE the
syncbytes.

The header and all further syncbytes are only written once: when formatting
a disk. The syncbytes trigger the hardware in such a way that it doesn't
matter if there are 2, 3, 4 or even more syncbytes in a row. The minimum is
11 1-bits in a row IIRC. The drive starts reading/writing the moment it
detects the first 0-bit. For more tecnical details please see my site at
Documents, chapter 1541.

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