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A7800DS - Improved
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<blockquote data-quote="wavemotion" data-source="post: 9291598" data-attributes="member: 543929"><p>As promised: <a href="https://github.com/wavemotion-dave/A7800DS" target="_blank">https://github.com/wavemotion-dave/A7800DS</a></p><p></p><p>Version 1.1 with major speed improvement to the point of being useful.</p><p>I removed all the frameskip stuff - we now run all frames all the time. I may revisit that decision on a few games that are stubbornly refusing to run at full speed.</p><p>Most commercial games run full frame rate. A few of the 320 mode games run down around 50 FPS but still playable.</p><p>Some homebrews work... specifically Meteor Shower which is beyond excellent clone/spiritual cousin to Astrosmash on the Intellivision.</p><p>Some of the homebew 320 games (Froggie and Space Invaders) are really hard to render correctly given the 320 pixels vs 256... I've done my best to scale but some pixels are going to be missing.</p><p>Sound is... functional. I'm not happy with it - keep the volume low so you get the sounds but you don't hear the background crackle that I'll need to work on (this was in the original version I started with).</p><p></p><p>Place the .NDS file anywhere and run it via UNLAUNCH or TWL++. Click cart slot to load ROM.</p><p></p><p>If it gets added to TWL++ it should take a command line filename to load and run.</p><p></p><p>Optimizing this was frustrating - it was really hand-tuned C code... it came down to finding just a few places where they did 4 byte loads vs a single 32-bit read and that one change produced a massive 30% speed improvement. All the other efforts I did only got another 10% or so...</p><p></p><p>Enjoy!</p></blockquote><p></p>
[QUOTE="wavemotion, post: 9291598, member: 543929"] As promised: [URL]https://github.com/wavemotion-dave/A7800DS[/URL] Version 1.1 with major speed improvement to the point of being useful. I removed all the frameskip stuff - we now run all frames all the time. I may revisit that decision on a few games that are stubbornly refusing to run at full speed. Most commercial games run full frame rate. A few of the 320 mode games run down around 50 FPS but still playable. Some homebrews work... specifically Meteor Shower which is beyond excellent clone/spiritual cousin to Astrosmash on the Intellivision. Some of the homebew 320 games (Froggie and Space Invaders) are really hard to render correctly given the 320 pixels vs 256... I've done my best to scale but some pixels are going to be missing. Sound is... functional. I'm not happy with it - keep the volume low so you get the sounds but you don't hear the background crackle that I'll need to work on (this was in the original version I started with). Place the .NDS file anywhere and run it via UNLAUNCH or TWL++. Click cart slot to load ROM. If it gets added to TWL++ it should take a command line filename to load and run. Optimizing this was frustrating - it was really hand-tuned C code... it came down to finding just a few places where they did 4 byte loads vs a single 32-bit read and that one change produced a massive 30% speed improvement. All the other efforts I did only got another 10% or so... Enjoy! [/QUOTE]
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