Subject: Re: [stella] chewing a unicycle From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Tue, 13 Feb 2001 10:17:23 -0500 |
In message <012b01c095c1$03b0a970$0100a8c0@screamer>, "Andrew Davie" writes: >If I was in tightly timed code, and wanted to do a store at that point, like >this... > > sta COLUBK ;3 > ;one cycle extra needed to be used... how? > .byte $8D,COLUBK,0 > >This is effectively replacing the zero-page address refrence (3 cycles) with >an absolute address (4 cycles). >Thought this might help somebody, sometime :) Andrew, You can also just use the TIA mirror at $100-$13F: sta $109 3 ; stores to COLUBK mirror at $109 I have complete VCS memory maps available at http://web.mit.edu/ecwilkso/www/VCS_hardware/ -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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