Format of COMM-DRV port control block |
| Offset | Size | Description |
|---|---|---|
|
00h |
WORD |
port IO address |
|
02h |
WORD |
port IRQ |
|
04h |
WORD |
baud rate |
|
06h |
WORD |
parity |
|
08h |
WORD |
data bits |
|
0Ah |
WORD |
stop bits |
|
0Ch |
WORD |
break status (0000h off) |
|
0Eh |
WORD |
flow control protocol |
|
10h |
BYTE |
input block |
|
11h |
BYTE |
output block |
|
12h |
WORD |
low threshold |
|
14h |
WORD |
high threshold |
|
16h |
WORD |
segment of buffer |
|
18h |
WORD |
offset of buffer |
|
1Ah |
WORD |
input buffer length |
|
1Ch |
WORD |
output buffer length |
|
1Eh |
BYTE |
auxiliary address |
|
1Fh |
BYTE |
spare |
|
20h |
4 WORDs |
spares |