Specifications

EPC-21/22 Hardware Reference
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Table of Contents
1. Product Description ............................................................................................... 1
Specifications ....................................................................................................... 2
2. Configuring the BIOS Setup ................................................................................. 3
Power-On Screen Display .................................................................................... 3
BIOS Setup Screen .............................................................................................. 4
EXM Setup Screen ............................................................................................... 6
Fixed Disk Menu ................................................................................................. 7
User-Definable Drive Types .......................................................................... 8
3. Theory of Operation .............................................................................................. 11
Processor and Coprocessor .................................................................................. 11
Memory ................................................................................................................ 11
Figure 1: Base Memory Chip Location .................................................. 11
Memory Expansion ....................................................................................... 12
Memory Map ................................................................................................. 13
Cache (EPC-22 only) ........................................................................................... 14
ROM and ROM Shadowing ................................................................................. 14
Battery .................................................................................................................. 14
Figure 2: Battery Replacement ............................................................... 15
Video Controllers ................................................................................................. 15
Front Panel LED .................................................................................................. 16
Resetting the EPC ................................................................................................ 16
EXM Expansion Interface .................................................................................... 17
Watchdog Timer .................................................................................................. 17
4. Connectors ............................................................................................................. 19
Serial Ports ........................................................................................................... 19
Keyboard .............................................................................................................. 20
EXM Expansion Connector ................................................................................. 20
EXM Expansion Connector Signals .................................................................... 21