Cogent SA85 Driver for Modicon Modbus Plus Cards :  Version 1.10
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Chapter 2. Installation

Table of Contents

2.1. Memory Address Configuration
2.2. Host Interrupt Configuration
2.3. Software Installation
2.3.1. QNX 4
2.3.2. QNX 6
2.3.3. Linux
2.3.4. Installed file locations

Please refer to the Modbus Plus Network Planning and Installation Guide when installing the SA85 or PC85 card in an IBM AT compatible computer.

2.1. Memory Address Configuration

The SA85 or PC85 card occupies 2K of host memory space. The base address is user-selectable. The most common location to install the card is 0xD0000. The table below lists the possible locations and describes other hardware that might be using the space.

Memory AddressRemarks
0x80000Occupied by RAM in >512k systems
0x88000Occupied by RAM in >512k systems
0x90000Occupied by RAM in >512k systems
0x98000Occupied by RAM in >512k systems
0xA0000Used by EGA/VGA
0xA8000Used by EGA/VGA
0xB0000Used by MDA
0xB8000Used by CGA
0xC0000BIOS Extensions (possible EGA/VGA) minimum SA85 address
0xC8000BIOS Extensions (hard disk controller)
0xD0000Used by EMS memory (recommended location)
0xD8000Used by EMS memory
0xE0000BIOS Extensions (normally unused)
0xE8000BIOS Extensions (normally unused)
0xF0000System ROMs, BASIC
0xF8000PC BIOS
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1.3. Applicable Reference Documents Home 2.2. Host Interrupt Configuration

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