|
| |
Parallel Printer Port
|
Ports 278, 378, 3BC printer data output
(readable)
|
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
data bit 0, hardware
pin 2 |
| 1 |
2 |
02h |
data bit 1, hardware
pin 3 |
| 2 |
4 |
04h |
data bit 2, hardware
pin 4 |
| 3 |
8 |
08h |
data bit 3, hardware
pin 5 |
| 4 |
16 |
10h |
data bit 4, hardware
pin 6 |
| 5 |
32 |
20h |
data bit 5, hardware
pin 7 |
| 6 |
64 |
40h |
data bit 6, hardware
pin 8 |
| 7 |
128 |
80h |
data bit 7, hardware
pin 9 |
| Ports
279, 379, 3BD printer status register (Parallel Printer
Port)
|
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
1 = time-out |
| 1 |
2 |
02h |
not used |
| 2 |
4 |
04h |
| 3 |
8 |
08h |
1 = error, pin 15 |
| 4 |
16 |
10h |
1 = on-line, pin
13 |
| 5 |
32 |
20h |
1 = out of paper,
pin 12 |
| 6 |
64 |
40h |
0 = Acknowledge,
pin 10 |
| 7 |
128 |
80h |
0 = busy, pin 11 |
| Ports
27A, 37A, 3BE printer control register (Parallel Printer
Port) |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
1 = output data to
printer, (pin 1) |
| 1 |
2 |
02h |
1 = auto line
feed, (pin 14) |
| 2 |
4 |
04h |
0 = initialize
printer, (pin 16) |
| 3 |
8 |
08h |
1 = printer reads
output, (pin 17) |
| 4 |
16 |
10h |
0 = IRQ disable,1=IRQ
enable for ACK |
| 5 |
32 |
20h |
not used |
| 6 |
64 |
40h |
| 7 |
128 |
80h |
|
