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Values for PS/1 hard disk feature number

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Value Description

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