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- 16-bit Acesses on ISA bus
July 12, 2005, 4:56 pm
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Re: 16-bit Acesses on ISA bus
It's been long long time since my last ISA design. From what I rememebr, 16
bit transfers on ISA bus are always word aligned: i.e. A0 is always 0. This
goes for both memory and I/O. If you can find IBM's "AT technical
reference", you can see the original schematics of the ISA bus interface. As
I remember, the logic there made it impossible to have a 16 bits I/O on the
odd addresses... (I'm telling you all these things off my head. As I said
before, it's been a long long time since my last ISA design).
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