Posted By
JamesD
on 2017-02-17
16:29:16
|  Re: A mathematical demo
I took a glance at your 6809 code.
Many instructions dealing with index registers requires 2 byte opcodes.
Y is the worst for this.
So you want to use X for indexing the most often.
U oriented indexing is also 1 byte opcodes, so use it before Y when you can.
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