Subject: Re: [stella] Star Fire: 1 step forward 2 steps back :-) From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Sun, 1 Dec 2002 12:14:53 -0500 (EST) |
On Sun, 1 Dec 2002, Eckhard Stolberg wrote: > Putting BRK instructions on the bankswitching hotspots is not > going to work that well. Remember that the 6502 always reads > at least two bytes for every instruction. So a BRK at $FFF8 Grr. I forgot. That's what I get for writing code when I've been awake for 30 hours! Thanks Eckhard! -Chris > It's probably best to just waste another 6 bytes in both banks > and have special switching code for the startup routine. If > you can put the access to the hotspot just in front of where > the init code is in the other bank, you could probably get away > with only 3 extra bytes for the BIT instruction. > > BTW, the startup banks for some of the bankswitching schemes > was changed for the second version of Playbin. I'm not sure if > Bob added that change to Makewav, but you probably can select > that value with the command line switch for the bankswitching > scheme. > > > Ciao, Eckhard Stolberg > > > ---------------------------------------------------------------------------------------------- > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > > ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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