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Decoded ROM

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3 replies

by neilmay2

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Why is it necessary to ensure a ROM is decoded at the very top of the address page, based on a 6502 CPU??
My explanation for the above related to the characteristics of an x86 microprocessor.
Help greatly appreciated on this one, pointers for sites of info on this topic too please.
cheers

3 replies

by csmith

The entry point for ROM on boot is hard wired.
When you design a computer, you decide where the program boot will start, and then you physically wire/design it in.
It is a personal/engineering/corporate choice.
It is not necessary to put it at the top.
I have worked on computers in the 50s and 60s, where this was not the case.
Regards, Chris

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