Subject: Re: [stella] programming teaser From: "Andrew Davie" <atari2600@xxxxxxxxxxxxx> 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 Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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