Subject: Re: [stella] Ms. Pac Man, Mr. Do, striped playfields, and one-line kernels|
From: Christopher Tumber <christophertumber@xxxxxxxxxx>
Date: Wed, 01 Sep 2004 18:15:15 -0400
>How the heck did they fit that in? You can't change both GRP0 and GRP1 >to the appropriate rows of two arbitrarily positioned and distinct >sprites between WSYNC and the end of horizontal retrace. No way. >Uh-uh. You just... can't. As mentioned, VDEL is your friend here. In addition, you can do something simple like shifting your code around: lda SpriteBuffer0,x ;setup for GRPN write on next scanline tay lda SpriteBuffer1,x sta WSYNC ; next scanline sty GRP0 sta GRP1 inx ;x = scanline # Chris...