Maybe your bankswitching instruction swaps the code out after x=8 and finds
an RTS where the ldy #21 was? Other than that I have no clue.
>From: "Andrew Davie" <atari2600@xxxxxxxxxxxxx>
>Reply-To: stella@xxxxxxxxxxxxxxxxxx
>To: <stella@xxxxxxxxxxxxxxxxxx>
>Subject: Re: [stella] programming teaser
>Date: Fri, 20 May 2005 05:57:50 -0400
>
>I goofed. The bmi should be beq. And the line constant was miscommented.
>Murphy's Law ;) Here is the corrected version of 'Tricky'...
>
> > loop
> > jsr Tricky ; do we ever return from this subroutine?
> > inc colour ; yes! but how?!!
> > lda colour
> > sta COLUBK
> > jmp loop
> >
> >
> >
> > Tricky
> >
> > ldx #$FF ; 'character'
> > line
> >
> > Continue
> >
> > inx
> > stx SET_BANK_RAM ; bankswitch to appropriate RAM
> >
> > ldy #21 ; draw scanlines in groups of 21
> >
> > anotherLine
> > ; draw a scanline here (code omitted)
> >
> > sta WSYNC
> >
> > dey
> > bne anotherLine
> > beq Continue
>
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