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Address decoding circuit using a decoder
Assume that one cannot find a 32Kx8 ROM chip but has lots of 8Kx8 ROM chips.
Four 8Kx8 ROM chips can be used to construct a 32Kx8 ROM module.
The ROM part of the
memory map is then:
Let us change the problem a little. If we cannot find a 32Kx8 ROM chip but can find many 8Kx8 ROM chips, we can replace the larger memory chip by 4 smaller ROM chips. The memory map needs to be modified accordingly.