Re: Universal grammar

In article <8764dkzlf3.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxx>, LEE Sau Dan
<danlee@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Hans> One should also be aware of that the early CPUs did not have
Hans> special treatment of IO (input/output) devices etc. Instead,
Hans> the computer manufacturer put some IO devices on specific
Hans> memory addresses, which the CPU could read and write
Hans> from. The chip hardware has since become more complicated.

You're talking about memory-mapped I/O. That's a separate dimension
from interrupts and DMA (direct-memory-access).

Sure. Info to those interested in the workings of a CPU - especially those
that somehow got the idea it is difficult. :-)

--
Hans Aberg
.

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