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back2root:ibm-pc-ms-dos:interrupts:int_46:start
int 46h - System DATA - Hard Disk 1 Parameter Table (AT and later)
not a true interrupt, but a far pointer to a table of informations on fixed disk
Format of fixed disk parameters:
| Offset | Size | Description |
|---|---|---|
| 00h | WORD | number of cylinders |
| 02h | BYTE | number of heads |
| 03h | WORD | starting reduced write current cylinder (XT only, 0 for others) |
| 05h | WORD | starting write precompensation cylinder number |
| 07h | BYTE | maximum ECC burst length (XT only) |
| 08h | BYTE | control byte * bits 0-2: drive option (XT only, 0 for others) * bit 3: set if more than 8 heads (AT and later only) * bit 4: always 0 * bit 5: set if manufacturer's defect map on max cylinder+1 (AT and later only) * bit 6: disable ECC retries * bit 7: disable access retries |
| 09h | BYTE | standard timeout (XT only, 0 for others) |
| 0Ah | BYTE | formatting timeout (XT only, 0 for others) |
| 0Bh | BYTE | timeout for checking drive (XT only, 0 for others) |
| 0Ch | WORD | cylinder number of landing zone (AT and later only) |
| 0Eh | BYTE | number of sectors per track (AT and later only) |
| 0Fh | BYTE | reserved |
The default parameter table array is located at F000h:E401h in 100% compatible BIOSes; the pointer may be overridden by the hard disk controller's BIOS to support drive formats unknown to the ROM BIOS
SeeAlso: INT 13/AH=09h,INT 1E,INT 41
back2root/ibm-pc-ms-dos/interrupts/int_46/start.txt · Dernière modification : de frater
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