Subject: [stella] Asymmetric Playfield From: Andrew Towers <mariofrog@xxxxxxxxxxx> Date: Tue, 04 Mar 2003 14:19:12 +1100 |
I am still yet a beginer at this programing I figured out how to do asymetical playfields with a small bug in it though.
In the "How to Draw an Asymmetric Reflected Playfield" example on The Dig (http://www.neonghost.com/the-dig/docs.html), there is a timing error in the comments. In the display kernel is the following code:
;PF2 rewrite must begin at exactly cycle 45!!, no more, no less STA PF2 ;[45]+2 = *47* ; > 46 PF2 no longer visible
Whereas the actual timing of STA PF2 is 3 cycles, and the comment should read something like:
;PF2 rewrite must begin at exactly cycle 45!!, no more, no less STA PF2 ;[45]+3 = *48* ; > 47 PF2 reflected visible
Just thought I'd mention this in case you're relying on cycle 47 access to do the changeover. If you add up the cycles in the kernel, it comes out at cycle 48.
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