Pc-98 Bios -

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

AH = 28h AL = mode 0 = 80x25 text (16 colors) 1 = 80x28 text (400 lines) 2 = 640x400 graphics (4 planes) 3 = 640x400 graphics (16 colors) INT 18h

AH = 45h DL = drive Returns: BL = sectors per track, BH = heads Get system timer ticks pc-98 bios

AH = 21h DH = row (0–24 or 0–27) DL = column (0–79) INT 18h

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 = 11h INT 18h ZF = 1

AH = 70h INT 18h Returns: AX = BCD version (e.g., 0x0123 = v1.23)

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 = 17h AL = rate (0–3Fh) INT 18h Set cursor position

AH = 42h (same registers as read)