Int 14/AH=1Fh

X00 FOSSIL - EXTENDED SERIAL PORT STATUS/CONTROL

AH = 1Fh
DX = port number
AL = direction
00h read modem control register
Return:
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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