BC 4000
Appendix B - Memory and I/O Map

Table of Contents

Memory Map
On Board I/O Map

Memory Map

00000  - 9FFFF     System DRAM                          

A0000  - BFFFF     VGA Video RAM                        

C0000  - C7FFF     VGA Video BIOS, may be shadowed      

C8000  - EFFFF     May be used as shadow RAM for slot BIOS
ROMS                          

F0000  - FFFFF     System BIOS, may be shadowed         

100000 - 3FFFFFF  Extended RAM, to 64MB with 16MB SIMMS                              

On Board I/O Map

ISA Ports          Description

0000 - 00FF        Various "AT" functions in ISP
chip  
                   and  keyboard controller               

01F0 - 01FF        IDE Hard Drive Interface            

02F8 - 02FF        COM2                                

03A0               Power Supply Status Port            

03B4 - 03B5        VGA                                 

03BC - 03BF        LPT1                                

03C0 - 03CF        VGA                                 

03D4 - 03D5        VGA                                 

03F0 - 03F7        Floppy/IDE                          

03F8 - 03FF        COM1                                

EISA Ports         Description                         

0C00 - 0CFF        Used by EISA Chip Set               

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