Z80 address decoder

Thread Starter

Kevil

Joined Jun 28, 2020
178
My friend would like to make an address decoder for Z80 see the truth table:

Address_decoder.jpg

Blue is "0" and red is "1". How to make the HW logic ?
 

djsfantasi

Joined Apr 11, 2010
9,151
If all bits are 0, return bit 1=1 and bits 2-6 to 0. ELSE, shift bits 4-7 to bits 3-6 and set bit 2 to a 1.

Looks like it could be done with a 74HC30 and a 74HC00 NAND gates.
 
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