Re: [stella] Very BASIC ASM Info needed...

Subject: Re: [stella] Very BASIC ASM Info needed...
From: Russ Perry Jr <slapdash@xxxxxxxxxxxx>
Date: Wed, 7 Mar 2001 23:54:30 -0600
At 10:25 PM +1100 3/7/01, Andrew Davie wrote:
>How about this one....
>    lda FrameCounter
>    cmp #2
>    adc #1
>    and #3
>    sta FrameCounter
>Not better than the first version, though.  This one is 12 cycles and 10

I'm not up on counting, as I don't really know 6502 assembly...
I guess the LDA and STA are two bytes each and 3 cycles because
they are using FrameCounter in zeropage?

Anyway, I started thinking there was another way, and I guess there
is, though it isn't quicker...

Initialize FrameCounter to 00x01x10 (x doesn't matter), then do:

    lda FrameCounter
    sta FrameCounter

If I counted right, that's 14 cycles, but only 8 bytes.  If you need
more room than time...
||  Russ Perry Jr   2175 S Tonne Dr #114   Arlington Hts IL 60005  ||
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