Pc-98 Bios Apr 2026

AH = 42h (same registers as read)

AH = 11h INT 18h ZF = 1 if no key ZF = 0 if key waiting → AX = scancode/ASCII pc-98 bios

AH = 21h DH = row (0–24 or 0–27) DL = column (0–79) INT 18h AH = 42h (same registers as read) AH

AH = 71h INT 18h Returns: AX = KB of RAM (usually 640) 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