Portwell WADE-8041, Manuals

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Appendix A
WADE-8041 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 – 0BE3 45K DOS
0BE4 – 0E1B 8.9K Program Area
0E1C – 9E26 576K Available
9E27 – 9FBF 6.4K Program Area
= Conventional memory ends at 640K =
9FC0 – 9FFF 1K Extended Bios Area
A000-AFFF 64 K VGA Graphics
B000 – B7FF 32 K Unused
B800 - BFFF 32 K VGA Text
C000 – CC7F 50 K Video rom
CC8F –DFFF 78 K unused
E000 -FFFF 128 K System ROM
HMA 64 K First 64K extended