Portwell RUBY-9712VG2A, Руководство пользователя

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Appendix A
RUBY-9712VG2A 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 – 04A4 16K DOS
04A5 – 0C7C 31K Program Area
0C7D – 9F3E 587K [Available]
9F3F –9FFF 3K Unused
= Conventional memory ends at 637K =
A000 – AFFF 64K VGA Graphics
B000 – B7FF 32K Unused
B800 – BFFF 32K VGA Text
C000 – CA7F 42K Video ROM
CA80 – CB00 2K Unused
CB01 – CBFE 4K High RAM
CBFF – CBFF 0.1K Unused
CC00 - D57F 38K ROM
D580 – D5FF 2K Unused
D600 – D77F 6K ROM
D780 – D949 7.2K Unused
D94A – DFFF 26K High RAM
E000 – EFFF 64K Unused
F000 – FFFF 64K System ROM
HMA 64K First 64K Extended