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Appendix A
RUBY-7720VG2A User’s Manual
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
Size
Device Description
0000-003F 1K
Interrupt
Area
0040-004F
0.3K
BIOS Data Area
0050-006F 0.5K
System
Data
0070-0E2E 54K
DOS
0E2F-0F66 4.9K
Program
Area
0F67-9F7F 576K
[Available]
= Conventional memory ends at 638K =
9F80-9FFF
2K
Extended Bios Area
A000-AFFF 64K
VGA
Graphics
B000-B7FF 32K
Unused
B800-BFFF 32K
VGA
Text
C000-CE7F 58K
Video
ROM
CE80-EEFF 130K
Unused
EF00-EFFF 4K
ROM
F000-FFFF 64K
System
ROM