>> The problem is that MSX-DOS puts a booting program starting in #20, so
>> disks formatted in this way can't be used for boot.
>No sweat!
>Older disk format only fills parameters up to offset 1C-1Dh (=number
>of reserved sectors), MSX bootsector routine starts at 1Eh, and the
>above starts at 20h, which leaves 2 bytes (at 1E-1Fh), just enough to
>put in a JR-instruction to a bit further on.
You are right! I was wrong for only 2 bytes!! 8-)
>MSX-DOS2 formatted disks already do it that way...
Yes, #1E contains: relative jump + "VOL_ID"+01+volume id. number.
In MS-DOS, #20 contains: number of sectors (4 bytes)+reserved
byte+#29+volume id. number.
>Do note though, that on bootup, only one half of the bootsector
>(offset 0-FFh, 256 bytes) is copied to C000h before C01Eh is called,
>making it a bit difficult to use the other half for boot code.
I learn one new thing every day thanks to this ML! 8-)
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Konami Man - AKA Nestor Soriano (^ ^)v - Itsumo MSX user
http://www.geocities.com/SiliconValley/Bay/9797/msx.htm
[EMAIL PROTECTED] ICQ#: 18281450
"In Windows 98, 3.000 found failures of W95 have been corrected..."
Translation: 3.000.000 not found failures continue without being corrected...
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