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AH = 1Fh DX = port number AL = direction 00h read modem control registerReturn:
BL = modem control register (see #00349) AH = status 01h write modem control register BL = modem control register (see #00349)Return:
AX = status
Notes: This function is intended to exactly emulate the PS/2 BIOS AH=05h call. X00 forces BL bit 3 set (interrupts cannot be disabled)
See Also: AH=00h - AH=05h"SERIAL"
Bitfields for X00 FOSSIL modem control register: Bit(s) Description (Table 00349) 0 data terminal ready 1 request to send 2 OUT1 3 OUT2 (interrupts) enabled 4 LOOP 5-7 reserved
Category: Serial I/O - Int 14h - X
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