Apple II for intro to microprocessors

From: Mike Ford <mikeford_at_socal.rr.com>
Date: Fri Jul 20 04:46:44 2001

>I can recommend you consider that the difference between the fastest speed and
>the optimal speed comes down to a number of things. Consider one case,
>wherein
>we speeded the operation of a multi-computer security system by reducing the
>baud rate of the monitor terminals from 9600 to 1200. That reduced the amount
>of idle (ENQ/ACK) traffic by 90%.
>
>Moreover, lots of I/O tasks require too much speed if you have to test a flag
>before fetching each byte. However, if your processor is running at a rate
>synchronized with the transfer, you only have to check the flag once, then
>use a
>loop tuned for the exact length of the transfer cycle. As Tony points
>out, it's
>based on the externally imposed rate, and if your oscillator doesn't
>synchronize
>with that, you have problems.

The nice thing about micros is that there are so many right ways of doing
things.
Received on Fri Jul 20 2001 - 04:46:44 BST

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