80188 interface with 2Mbit ROM

hi,

how to I program A16 & A17 address pin output?
need to program it to select block sections of an ext ROM.

Thanks.

Comments

  • Hope that someong can help you!
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  • My first guess would be to use normal
    segment offset addresses to access the ROM,
    the segment address is turned into a
    20-bit value by the processor and the
    16-bit offset is added.
    1234:0100 =
    12340+
    00100
    12440 Physical address, this 20-bit physical
    address corresponds to pins A0-A19 on the
    processor.
    Hope this helps.
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