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AH = 23h AL = feature number (see #00266) DL = drive number (80h,81h) ???
Return:
CF clear if successful CF set on error AH = status (see #00234 at AH=01h)
See Also: AH=21h"PS/1" - AH=22h"PS/1" - AH=24h"PS/1" - AH=25h"PS/1"
(Table 00266) Values for PS/1 hard disk feature number: 01h select 8-bit data transfers instead of 16-bit 02h enable write cache 22h Write Same, user-specified area 33h disable retries 44h set number of ECC bytes for read long/write long (see AH=0Ah,AH=0Bh) 54h set cache segments 55h disable lookahead 66h disable reverting to power-on defaults 77h disable error correctioni 81h select 16-bit data transfers (default) 82h disable write cache 88h enable error correction (default) 99h enable retries (default) AAh enable lookahead BBh set ECC length for read long/write long to four bytes CCh enable reverting to power-on defaults DDh Write Same, entire disk
See Also: #P0535
Category: Disk I/O Enhancements - Int 13h - H
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