Page 4-1
Manual 00650-519-1
Chapter 4: Address Selection
The RS422I-PA base address can be selected anywhere within the I/O bus address range 100-3F8
hex, providing 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 primary and secondary binary synchronous
communication ports are supported by the Operating System.) The base address locator program
FINDBASE provided on CD (or diskettes) will assist you to select a base address that will avoid
conflict with other installed computer resources. Then, the SETUP program will show you how to
position the address switches when you have selected a base address.
The following provides background information to help you better understand this process.
Hex Range
Usage
000-01F
DMA Controller 1
020-03F
INT Controller 1, Master
040-05F
Timer
060-06F
8042 (Keyboard)
070-07F
Real Time Clock, NMI Mask
080-09F
DMA Page Register
0A0-0BF
INT Controller 2
0C0-0DF
DMA Controller 2
0F0
Clear Math Coprocessor Busy
0F1
Reset Coprocessor
0F8-0FF
Arithmetic Processor
1F0-1F8
IDE Fixed Disk
200-207
Game I/O
278-27F
Parallel Printer Port 2
2F8-2FF
Asynchronous Comm’n (Secondary)
300-31F
Prototype Card
360-36F
Reserved
378-37F
Parallel Printer Port 1
380-38F
SDLC or Binary Synchronous Comm’n 2
3A0-3AF
Binary Synchronous Comm’n 1
3B0-3BF
Monochrome Display/Printer
3C0-3CE
Local Area Network
3D0-3DF
Color/Graphic Monitor
3F0-3F7
Floppy Diskette Controller
3F8-3FF
Asynchronous Comm’n (Primary)
Table 4-1:
Standard Address Assignments for 286/386/486 Computers