RE: [stella] Space Treat with score

["Dennis Debro" <ddebro@xxxxxxxxxxxxx>]

Hi Fabrizio,
> At the moment I'm almost completely out of ROM space, but I'd still
like
> to
> add a few more features...
> 
> Comments and suggestions are welcome as usual :)

Well a couple of ways to reclaim ROM is:
1) remove sei from the start of your code
	since the 6507 has no interrupts this isn't needed, right?
	(saves 1 byte)
2) use conditional branches where you can
	using bpl, bcc, bcs, etc. instead of jmp saves you a byte (this
	depends if the jump is within 255 bytes)
3) remove the mainloop routine from Nick's How To Draw a Playfield and
just
   place the corresponding routines in it's place
	Nick's outline is great to get started but when you're fighting
for
	ROM space each jsr/rts costs you 4 bytes when you can just place
the
	routine where it's needed.
4) replace your horizontal positioning routine with the one submitted by
   Manual and tweaked by Eric Ball
	
http://www.biglist.com/lists/stella/archives/200210/msg00281.html
http://www.biglist.com/lists/stella/archives/200211/msg00165.html
	
http://www.biglist.com/lists/stella/archives/200211/msg00167.html
	
http://www.biglist.com/lists/stella/archives/200212/msg00193.html

Take care,
Dennis


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