Chapter 3 - Installing Instrument Boards
55
Setting ISA Instrument Board I/O Base Address
The PC instrument board address is usually represented in three
hexadecimal digits. For example, “0x300” represents three hex
digits. These three digits could also be represented as 300H.
The table below shows the common PC I/O address assignments.
Address Device
Address Device
000-0FF System
2F0-2FF COM2
1F0-1FF Hard
Disk
378-37F LPT1
178-17B GTXI-701-
PCT 1,3
3B0-3DF LPT3,
Video
17C-17F GTXI-701-
PCT 2,4
3E0-3EF COM3
200-207 Game
Port 3F0-3F7 Floppy
238-23F Bus
Mouse 3F8-3FF COM1
278-27F LPT2
57C-57F PCT
3
2E0-2EF GPIB,
COM4 578-57B PCT
4
Table 3-1: Input/Output Base Addresses
In general, when allocating I/O addresses and any other system
resources (such as memory addresses, DMA channels, and IRQ
channels) to a given instrument board, make sure these resources
are not already allocated and used by the PC or another PC board.
Conflicts in resource allocation may result in the system becoming
inoperative. However, using address offsets in the GTXI enables
several boards to share the same base address. For information on
assigning system resources to the GTXI instrumentation platform or
the GTPC, see
Chapter 4, “Assigning Resources”
.
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