Address and Interrupt Tables B-1

Appendix B

Address and Interrupt Tables

B.1 System Memory Map

Address Range Definition Function
000000 - 09FFFF 640 KB memory Base memory
0A0000 - 0BFFFF 128 KB video RAM Reserved for graphics display
buffer
0C0000 - 0CBFFF Video BIOS Video BIOS
0E0000 - 0EFFFF
0F0000 - 0FFFFF
128 KB system BIOS System BIOS
System BIOS
10000 - 7FFFF
80000 - 27FFF
Extended memory Onboard memory
SIMM memory
FE0000 - FFFFFF 256 KB system ROM Duplicate of code assignment at
0E0000-0FFFFF