block diagram showin 74LS138 being used with Z80

[benbag2005]

i have i slight problem, and its got me stumped
i need to produce a block diagram for a simple mircoprocessor system,
showing how a 74LS138 logic device could be used as part of the
address decoding, if 4 * 1 Kbyte memory devices are to be used with a
Z80 CPU

normally i dont like asking but this i just cant figure out or find on
the net.
any help would be apprecaited
thanks for your help

 

[Andrew Holme]

benbag2005 wrote:

i have i slight problem, and its got me stumped
i need to produce a block diagram for a simple mircoprocessor system,
showing how a 74LS138 logic device could be used as part of the
address decoding, if 4 * 1 Kbyte memory devices are to be used with a
Z80 CPU

normally i dont like asking but this i just cant figure out or find on
the net.

http://www.google.co.uk/search?hl=en&q=address+decoding+74ls138