HP Compaq dc7100 SFF User Manual

5-16 361834-001 Technical Reference Guide
Input/Output Interfaces
Parallel Interface Control
The BIOS function INT 17 provides simplified control of the parallel interface. Basic functions
such as initialization, character printing, and printer status are provide by subfunctions of INT
17. The parallel interface is controllable by software through a set of I/O mapped registers. The
number and type of registers available depends on the mode used (SPP, EPP, or ECP). Table 5-14
lists the parallel registers and associated functions based on mode.
Base Address:
LPT1 = 378h
LPT2 = 278h
LPT3 = 3BCh
Table 5-14.
Parallel Interface Control Registers
I/O
Address Register
SPP
Mode
Ports
EPP
Mode
Ports
ECP
Mode
Ports
Base Data LPT1,2,3 LPT1,2 LPT1,2,3
Base + 1h
Printer Status LPT1,2,3 LPT1,2 LPT1,2,3
Base + 2h Control LPT1,2,3 LPT1,2 LPT1,2,3
Base + 3h Address -- LPT1,2 --
Base + 4h Data Port 0 -- LPT1,2 --
Base + 5h Data Port 1 -- LPT1,2 --
Base + 6h Data Port 2 -- LPT1,2 --
Base + 7h Data Port 3 -- LPT1,2 --
Base + 400h Parallel Data FIFO -- -- LPT1,2,3
Base + 400h ECP Data FIFO -- -- LPT1,2,3
Base + 400h Test FIFO -- -- LPT1,2,3
Base + 400h Configuration Register A -- -- LPT1,2,3
Base + 401h Configuration Register B -- -- LPT1,2,3
Base + 402h Extended Control Register -- -- LPT1,2,3

HP Compaq dc7100 SFF Specifications

General

Processor Speed	Up to 3.8 GHz
Graphics	Integrated Intel Graphics Media Accelerator 900
Audio	Integrated AC'97 audio
Form Factor	Small Form Factor (SFF)
Power Supply	240W
Processor	Intel Pentium 4
Chipset	Intel 915G Express
Memory	Up to 4 GB DDR
Storage	40 GB to 160 GB HDD
Optical Drive	CD-ROM or DVD-ROM
Network	Integrated Intel Gigabit Ethernet
Expansion Slots	1 PCI Express x16
Ports	USB 2.0, serial, parallel, VGA
Operating System	Windows XP Professional