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Appendix A
System Memory Address Map
Each On-board device in the system is assigned a set of memory addresses, which
also can be identical of the device. The following table lists the system memory
address used for your reference.
Memory Area
0000-003F
0040-004F
0050-006F
0070-0E2E
0E2F-0F6B
0F6C-9EFF
9F00-9FBF
9FC0-9FFF
A000-AFFF
B000-B7FF
B800-BFFF
C000-CEBF
CEC0- EFFF
F000-FFFF
Size
Device Description
1K
Interrupt Area
0.3K
BIOS Data Area
0.5K
System Data
54K
DOS
5K
Program Area
574K
Available
= Conventional memory ends at 636K =
3K
Extended Bios Area
1K
Unused
64K
VGA Graphics
32K
Unused
32K
VGA Text
59K
Video ROM
133K
Unused
64K
System ROM
WADE-8056 & 8556 User’s Manual