Subject: Re: [stella] Syncing without WSYNC From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Fri, 31 Aug 2001 01:10:16 -0400 (EDT) |
On Thu, 30 Aug 2001, B. Watson wrote: > This is a case where I'm trying to do so much in one scan line that > I can't afford the 3 cycles for the STA WSYNC... The loop was 75 cycles, > including the DEY;BNE top_loop at the end, I changed one of my STA GRP0's to > a STA $2000+GRP0 to make it eat one more cycle, bringing me up to 76.. Using STA.W GRP0 will force the assembler to use a 2 byte address instead of zero page mode. Makes the code a bit easier to read. :) > Of course, the last time through the loop, the BNE won't branch, so I'll be at > the 75th cycle of the last scanline... Slowly, I'm learning this stuff :) WHAHAHAHA!!!!! There's never any end! Ok, ok...I've been hacking on the interlaced video thing again, so I'm a bit crazed at the moment. But I did manage to get both Field 0 and Field 1 to be recognizable. (Anyone who starts with "How to Draw a Playfield" is only seeing Field 1.) I just haven't gotten the pair to interlace yet. -Chris - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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