Appendix A
ROBO-8773VG 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.
Memory Area
Size
Device Description
0000 – 003F
1K
Interrupt Area
0040 – 004F
0.3K
BIOS Data Area
0050 – 006F
0.5K
System Data
0070 – 03DE
13K
DOS
03DF – 0BB6
31K
Program Area
0BB7 – 9F7F
583K
[Available]
= Conventional memory ends at 640K =
9F80 – 9FFF
2K
Extended BIOS Area
A000 – AFFF
64K
VGA Graphics
B000 – B7FF
32K
Unused
B800 – BFFF
32K
VGA Text
C000 – CA1F
40K
Video ROM
CA20 – CB00
3.5K
Unused
CB01 - CBFE
4K
High RAM
CBFF – D549
37K
Unused
D54A – D7FE
10K
High RAM
D7FF – D7FF
0.1K
Unused
D800 – E7FF
64K
Page Frame
E800 – E800
0.1K
Unused
E801 – EAFF
11K
High RAM
EB00 – EFFF
20K
Unused
F000 – FFFF
64K
System ROM
HMA
64K
First 64K Extended