INT 13 U - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - SET CONTROLLER FEATURES REGISTER 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) SeeAlso: AH=21h"PSIBM PS/2, any model/1",AH=22h"PSIBM PS/2, any model/1",AH=24h"PSIBM PS/2, any model/1",AH=25h"PSIBM PS/2, any model/1" (Table 00266) Values for PSIBM PS/2, any model/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 SeeAlso: #P0535