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Chapter 4: Address Selection
The AOB8/16 and AOB16/16 require 16 or 32 consecutive address locations in I/O space, respec-
tively. The starting, or base address, can be selected anywhere within an I/O address range 100-3FF
hex (except 1F0 through 1F8) in AT-class computers and 200- 3FF in XT-class computers, provid-
ing that the address does not overlap with other functions. If in doubt refer to the table below for
a list of standard address assignments. The Base Address Locator program FINDBASE provided
on diskette will assist you in selecting a base address that will avoid this conflict.
Figure 4-1: Standard Address Assignments for PC and PC/XT Computers
Manual Number: 00650-010-6
Hex Range
000-0FF
Internal System - Not Usable
1F0-1FF
AT Hard Disk
200-207
Game Control
278-27F
Parallel Port (LPT2)
238-23B
Bus Mouse
2E8-2EF
Asynchronous Communications (COM4)
2F8-2FF
Asynchronous Communications (COM2)
300-31F
Prototype Card
320-32F
XT Hard Disk
378-37F
Parallel Port (LPT1)
380-38F
SDLC Communications
3A0-3AF
SDLC Communications
3B0-3BB
MDA
3BC-3BF
Alt. Parrallel Port
3C0-3CF
EGA
3DO-3DF
CGA
3E8-3EF
Asynchronous Communications (COM3)
3F0-3F7
Floppy Disk
3F8-3FF
Asynchronous Communications (COM1)
Usage
Page 7
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