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| author | Gene Cumm <gene.cumm@gmail.com> | 2015-02-15 11:01:20 -0500 |
|---|---|---|
| committer | Gene Cumm <gene.cumm@gmail.com> | 2015-02-15 11:01:20 -0500 |
| commit | 9efca14a13d535551a8e5f5e7475b77b6a2c166e (patch) | |
| tree | 2bf342af0b7cb2cec9f2905cebea3e6e160f3ceb | |
| parent | 69cd07642a7d95265888f670f8d050f1ddf3ab01 (diff) | |
| download | syslinux-9efca14a13d535551a8e5f5e7475b77b6a2c166e.tar.gz syslinux-9efca14a13d535551a8e5f5e7475b77b6a2c166e.tar.xz syslinux-9efca14a13d535551a8e5f5e7475b77b6a2c166e.zip | |
diag/geodsp: Update README with a sample
Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
| -rw-r--r-- | diag/geodsp/README | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/diag/geodsp/README b/diag/geodsp/README index 9129b694..4539106d 100644 --- a/diag/geodsp/README +++ b/diag/geodsp/README @@ -27,3 +27,27 @@ majority of the BIOS parameter block). dd bs=1 skip=3 count=87 if=/dev/fd0 of=fd0.bpb dd conv=notrunc if=geodspms.img of=/dev/fd0 dd conv=notrunc bs=1 seek=3 count=87 if=fd0.bpb of=/dev/fd0 + + +Sample output: + + CHS 0081,FE,3F + @CHS 0000,01,01:0000003F + @CHS 0001,00,01:00003EC1 + @EDD 0000003F:0000003E + @EDD 00003EC1:00003EC1 + D=EDD + end + +The first line is the interpreted geometry per INT 13h AH=08h,DI=00h (in +hex). The second line is the data value at the sector CHS 0,1,1 +(indicating effective sectors per track). The third line is the data +value at CHS 1,0,1 (indicating effective heads per head count). The +fourth line indicates the value read at LBA 63. The fifth line +indicates the value read at LBA 16065. The sixth line indicates the +final expected mode. + +Images created by the Perl variant up to and including 6.03 are off by +one and shifted by one byte. In the above, the second line might read +"00003E00" instead of "0000003F". + |