User`s manual

DIGITAL-LOGIC AG MSLB-P5 Manual V0.3
PRELIMINARY 178
Continued
AH = 01h Send character
Entry:
AL Character to transmit
DX Serial port (0-3)
Exit:
AH Line status
AH = 02h Receive character
Entry:
DX Serial port (0-3)
Exit:
AL Character received
AH Line Status
AH = 03h Return serial port status
Entry:
DX Serial port (0-3)
Exit:
AH Line status
AL Modem status
AH = 04h Extended Initialize (PS/2)
Entry:
DX 0-3 = Communications adapter
AL 00 = Break
01 = No break
BH Parity:
00 = None
01 = Odd
02 = Even
03 = Stick parity odd
04 = Stick parity even
BL Stop bits:
00 = One
01 = Two if 6,7, or 8-bit word length
One and one-half if 5-bit word length
CH Word length:
00 = 5 bits
01 = 6 bits
02 = 7 bits
03 = 8 bits
CL Baud rate:
00 = 110 baud
01 = 150 baud
02 = 300 baud
03 = 600 baud
04 = 1200 baud
05 = 2400 baud
06 = 6000 baud
07 = 9600 baud
08 = 19200 baud
Exit:
AL Modem status
AH Line status
AH = 05h Extended Communications Port Control (PS/2)
AL = 00 Read modem control register
Entry:
DX Serial port (0-3)
Exit:
BL Modem control register
AL = 01 Write modem control register
Entry:
DX Serial port (0-3)
BL Modem control register
Exit:
AL Modem status
AH Line status