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AST RESEARCH TECHNICAL BULLETIN TB-0079 4-1-85
PROPER USE OF THE AST MP MINI
When expanding the memory of the IBM PC or compatibles with the
AST MP Mini card, it is important to remember that no matter what
PC is used, there must be exactly 256KB of user RAM installed
below the AST MP Mini. This is because the MP Mini has a fixed
starting address of 0040:0000 Hexadecimal. The ending address is
A000:0000 Hexadecimal. This means that no other expansion card
may address within the 256KB-640KB range of user RAM, even if the
MP Mini is not fully loaded with 256KB and the optional Mini Pak.
To conclude, the PC must have 256KB on the system board, or the
combination of the system board and another expansion card,
before the MP Mini can be installed. There must not be any other
RAM resident in the PC between the 256KB and 640KB range.