Pc-98 Bios -

AH = 41h DL = drive CX = track number (0–79 for 2HD) DH = head (0 or 1) CH = sector number (1–8 for 2HD) AL = number of sectors ES:BX = buffer INT 18h Returns: CF = 0 if OK

AH = 40h DL = drive (0=A, 1=B, etc.) INT 18h Returns: CF = 0 if OK pc-98 bios

AH = 60h INT 18h Returns: DX:AX = 32-bit tick count (1 tick = ~55ms) AH = 41h DL = drive CX =

AH = 25h AL = lines to scroll CH = top row, CL = left col DH = bottom row, DL = right col BH = fill color INT 18h pc-98 bios

AH = 42h (same registers as read)