Specifications

84 AMD Geode™ GeodeROM Functional Specification
Serial Port BIOS Support
32087C
Returns:
AL Port parameters:
Bits [7:5] - Data rate:
000 = 110 bps
001 = 150 bps
010 = 300 bps
011 = 600 bps
100 = 1200 bps
101 = 2400
110 = 4800
111 = 9600
Bits [4:3] - Parity:
00 = None
10 = None
01 = Odd
11 = Even
Bit 2 - Stop bit:
0= Clear
1= Set
Bits [1:0] - Data size; character length:
00 = 5
01 = 6
10 = 7
11 = 8
DX Port number; BDA location:
00h = 40:0h
01h = 40:2h
02h = 40:4h
03h = 40:6h
Parameter Description
AH Line status:
Bit 7 = Timeout error occurred
Bit 6 = Transfer shift register empty
Bit 5 = Transfer holding register empty
Bit 4 = Break occurred
Bit 3 = Framing error occurred
Bit 2 = Parity error occurred
Bit 1 = Overrun error occurred
Bit 0 = Data ready
AL Modem status:
Bit 7 = Carrier detect
Bit 6 = Ring indicator
Bit 5 = Data set ready
Bit 4 = Clear to send
Bit 3 = Delta carrier detect
Bit 2 = Trailing edge of ring indicator
Bit 1 = Delta data set ready
Bit 0 = Delta clear to send