Parallel Interface Programming - HP Compaq D315 Technical Reference Manual
Hp personal computers technical reference guide
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Also See for Compaq D315:
- Hardware reference manual (54 pages) ,
- Safety and regulatory information manual (28 pages) ,
- Quick setup manual (11 pages)
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5.5.4 PARALLEL INTERFACE PROGRAMMING
Programming the parallel interface consists of configuration, which typically occurs during POST,
and control, which occurs during runtime.
5.5.4.1 Parallel Interface Configuration
The parallel interface must be configured for a specific address range (LPT1, LPT2, etc.) and also
must be enabled before it can be used. When configured for EPP or ECP mode, additional
considerations must be taken into account. Address selection, enabling, and EPP/ECP mode
parameters of the parallel interface are affected through the PnP configuration registers of the
LPC47B367 I/O controller. Address selection and enabling are automatically done by the BIOS
during POST but can also be accomplished with the Setup utility and other software.
The parallel interface configuration registers are listed in the following table:
Table 5–10. Parallel Interface Configuration Registers
Parallel Interface Configuration Registers
Index
Address
Function
30h
Activate
60h
Base Address MSB
61h
Base Address LSB
70h
Interrupt Select
74h
DMA Channel Select
F0h
Mode Register
F1h
Mode Register 2
Table 5-10.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
Technical Reference Guide
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Value
00h
00h
00h
00h
04h
00h
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