Portwell RUBY-9715VG2AR - System Memory Address Map

Appendix A
RUBY-9715VG2AR 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 – 0E2E 54K DOS
0E2F – 0F66 4.9K Program Area
0F67 – 97FF 546K [Available]
= Conventional memory ends at 608K =
9800 – 9FBF 31K Extended BIOS
9FC0 – 9FFF 1K Unused
A000 – AFFF 64K VGA Graphics
B000 – B7FF 32K Unused
B800 – BFFF 32K VGA Text
C000 – CA9F 42K Video ROM
CAA0 – DFFF 85K Unused
E000 - FFFF 128K System ROM
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