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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
0F0000 - 0FFFFF 64 KB 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