(sorry if this is duplicate post...sent via wrong address 1st time)
I found a disassembly of Eckhard Stolberg's bigmove demo and have noticed
sporadic interest in it based on some Googling. The version I found is
here:
http://www.io.com/~nickb/atari/doc/bigmove.a65
With minimal tweaking, I got it to compile using dasm, but now I'm trying to
add some more meaningful documentation as a learning exercise. I was
wondering if someone else has already done this, as well as a better
conversion to dasm (one that uses vcs.h). If so, please post it. If not,
do you think others can benefit from such a conversion?
I figured out some of the ????? comments and replaced hard-coded
addresses/values with their respective labels. My goal in all this is to
figure out how to (A) get precise horizontal positioning and (B) draw
multiple sprites on a single line.
I think I understand some of the theory behind the space invaders demos I've
seen. I've also managed to hack together something (from "scratch") that
displays 8 non-flickering sprites in a single scanline, but their
positioning is WHACK to say the least. :)
I've had many great and memorable "A-HA!" moments with Stella programming so
far, but the positioning one eludes me. I think the most helpful code I
could use right now would be a hard-coded, non-moving kernel that displays a
static series of sprites, just so I can easily follow the code, count the
cycles, and see what combination of NUSIZ0/1's, RESP0/1's, GRP0/1's, and
NOPs to use. Handed to me on a silver platter. And spoonfed...
Respectfully,
Sorry-2-B-A-N00b
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