Decoding

Hi i need urgent help with partially decoding a memory map:

The map is as follows:

DVART 81000f
810000

RAM 05ffff
050000

EPROM 01ffff
000000

I would need the circuit diagram
Thanks
Matt

Comments

  • : Hi i need urgent help with partially decoding a memory map:
    :
    : The map is as follows:
    :
    : DVART 81000f
    : 810000
    :
    : RAM 05ffff
    : 050000
    :
    : EPROM 01ffff
    : 000000
    :
    : I would need the circuit diagram
    : Thanks
    : Matt
    :
    Use a 74ls138 decoder chip and a few NAND gates. Address decoding is realy simple if you know binary math. The 138 will decode 3 address line out to 8 banks of arbatrary size.
    ET

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