System Memory |
Size |
Memory Address |
System Function |
640 K |
00000000 - 0009FFFF |
Base Memory |
128 K |
000A0000 - 000BFFFF |
Video RAM |
32 K |
000C0000 - 000C7FFF |
Video ROM |
32 K |
000C8000 - 000CFFFF |
Legacy USB Device Header
(when legacy support enabled) |
64 K |
000D000 - 000DFFFF |
Unused |
48 K |
000E0000 - 000EBFFF |
Unused (Not available
for option cards. May use for UMBs.) |
16 K |
000EC000 - 000EFFFF |
16-bit cacheable,
shadowable, read-only memory. Not available for option cards. |
64 K |
000F0000 - 000FFFFF |
System BIOS ROM shadow
image |
15 M |
00100000 - 00FFFFFF |
Standard Extended Memory |
64 M |
01000000 - 04FFFFFF |
Rest of Extended Memory |
60 M |
05000000 - 07FFFFFF |
Unused |
512 K |
08000000 - 0807FFFF |
Standard Direct Video
Memory |
512 K |
08080000 - 080FFFFF |
Optional Direct Video
Memory |
1919 M |
08100000 - 7FFFFFFF |
Unused |
16 M |
80000000 - 80FFFFFF |
Memory mapped I/O
devices |
~2000 M |
81000000 - FDFDFFFF |
Unused/System ROM
aliases |
128 K |
FDFE0000 - FDFFFFFF |
System ROM (alias) |
~32 M |
FE000000 - FFFDFFFF |
Unused |
128 K |
FFFE0000 - FFFFFFFF |
System BIOS ROM |
|