|
| |
INT 14 - SERIAL I/O - EXTENDED COMMUNICATION PORT CONTROL (CONVERTIBLE,PS)
|
Input |
Output |
|
AX
|
05h |
00h |
RS232 Status |
Modem Status |
AX |
|
BX
|
|
|
|
Modem Status |
BX |
|
CX
|
|
|
|
|
CX |
|
DX
|
Port
Number (0-3) |
|
|
DX |
| ES:DI |
|
|
ES:DI |
|
Input |
Output |
|
AX
|
05h |
01h |
RS232 Status |
Modem Status |
AX |
|
BX
|
|
Modem Control |
|
Modem Status |
BX |
|
CX
|
|
|
|
|
CX |
|
DX
|
Port
Number (0-3) |
|
|
DX |
| ES:DI |
|
|
ES:DI |
| Modem
Control Register |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
Data Terminal Ready |
| 1 |
2 |
02h |
Request To Send |
| 2 |
4 |
04h |
OUT1 |
| 3 |
8 |
08h |
OUT2 |
| 4 |
16 |
10h |
LOOP |
| 5 |
32 |
20h |
Reserved |
| 6 |
64 |
40h |
| 7 |
128 |
80h |
|