Chapter 9: LPT1 parallel port
LPT1 is an alternate function for the digital I/O connector J7. It supports the
unidirectional standard mode and the bi-directional mode. The I/O address for
LPT1 is 278h, with interrupt IRQ7.
BIOS Setup configuration for LPT1
The digital I/O connector J7 is configured in the BIOS Setup Custom Configuration
menu as either a digital I/O port (default) or as an LPT parallel port. Toggle the
EZIO (1050)/LPT (278) field to select LPT. When digital I/O (EZIO) is selected the
base address is 1050h, with no interrupt. LPT uses base address 278h with IRQ 7.
Configuring the LPT signals
The signals on connector J7
must
be pulled low when using this port as LPT.
Jumper block W1 uses 10K ohm resistor networks to configure these lines as low.
See page 18 for the location of W1. Ensure that W1[2:3] is jumpered before
connecting a printer cable.
Table 9–1
LPT lines pulled low jumper
Jumper block W1
Pins jumpered
Configuration of LPT lines
[1:2] Pulled
high
[2:3]* Pulled
low
* default
72
Содержание 5266
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