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Chapter 5: LPT1 parallel port, LCD and keypad
LPT1 parallel port
LPT1 uses a 26-pin connector. It supports the unidirectional standard mode, bi-
directional mode, enhanced parallel port (EPP) mode, and extended capabilities
port (ECP) mode. The default I/O address for LPT1 is 378h, with the default
interrupt is IRQ7. You can choose the addresses 378h, 278h, or 3BCh, or interrupt
IRQ5 in Setup.
The LPT1 port supports a number of devices including a PC compatible printer, an
LCD display, or a keypad.
Table 5–1
LPT1 connector: J19
Pin #
1
3
5
7
9
11
13
15
17
19
21
23
25
* = active low
Installing a printer
1. Make sure that the LPT1 port is in standard or bi-directional mode.
2. Connect an Octagon VTC–5/IBM cable from the LPT1 port (J19) to the 25-pin
connector on your printer cable.
3. Connect the cable to your printer.
J19 – LPT1 connector
Pin Name
Pin Name
STB*
AFD*
PD[0]
ERR*
PD[1]
INIT*
PD[2]
SLIN*
PD[3]
Gnd
PD[4]
Gnd
PD[5]
Gnd
PD[6]
Gnd
PD[7]
Gnd
ACK*
Gnd
BUSY
Gnd
PE
Gnd
SLCT
VCC5
Pin #
2
4
6
8
10
12
14
16
18
20
22
24
26
47
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