archive.worldofdragon.org

The Built in debugger in MAME is very good once you get the hang of it !

You can set breakpoints, examine mem/code - change stuff on the fly etc....

/SImon

I'm Working on a coco2 version - it should be possible, only time will tell

ok they said it couldn't be done..... (don't tell me that, it just fuel for my fire)..... i know this is not the dragon (it's a coco) - but with the HALT NMI disk controller they told me we could do NOTHING while loading.... BAHH YOU LOOSE !! lets play 7.8 Khz 2 voice music while loading a disk (yes...

OK. here is the complete sourcecode for my assembly demo + various utils for image/music conversion + a .dsk image of the demo in *normal* and autorun versions.... this demo has been timed for NTSC coco 1 or 2 32k (it will run on a d32 pal (timing is wrong)) - don't try it on a d64 as it will sound ...

THX guys....

this is a *first release* due to time pressure, so it's not as polished as i would like, but it does prove the point....

WE CAN HAVE OUR CAKE AND EAT IT !!!! - takes alot of funky programming, but entirely DOABLE

OK, i kinda went into hiding for a while... (helping out others with various assembly code while i cultivated my madness)

enjoy this little demo (WILL work on a bog standard d32 (32k))

https://www.youtube.com/watch?v=LDyL8d6gRJ0

/Simon

OMG ! - you performed open heart surgery on your d64 to make my 2voice irq music work... i am humbled !!!!

if you want a really *indepth* explanation, then you can study this

http://www.drdobbs.com/architecture-and ... /184416337

lots of ways to perform a rotation... shearing is fast.... but this is faster... the *bad* thing here is the 2bpp limit, so we have to spend time looking up 4 pixels in a texture and combining those into one byte to plot essentially you just have a lookup that provides dx/dy for a given line through...

sin/cos lookup once per frame to calculate a deltax/y for a lookup into the texture LOTS AND LOTS (a months worth) of nasty tricks to improve speed.... sin/cos are 8:8 fixed point that vary from 1 to -1 (360 degrees transposed into 256 steps).... line start address table is 16bit pixel translation t...