[stella] Newbie lesson relearned - WSYNC & HMOVE

[Ruffin Bailey <rufbo1@xxxxxxxxxxx>]

If you don't learn your history, you're condemned to repeat it, or 
something like that.

http://www.biglist.com/lists/stella/archives/199808/msg00066.html

And that's why missile.asm didn't work for Kirk, I'd imagine.  The 
missile.asm file was left over from the beginning of that thread, and at 
least two people replied to suggest I move the hit to HMOVE to 
immediately after a WSYNC.  I'm afraid I'd been using (and was still 
using) Stella 0.7 which doesn't show that mistake's effects.  I've 
started using Stella 1.1.2 on the Mac now.  I apologize for the bins I'd 
kicked out recently as well; same problem was still taboo.

Here's the clip that needed to be changed:

; SCREEN DRAW
LF07D: LDA    INTIM   ;4  Here's the screen draw routine.
       BNE    LF07D   ;2
       STA    WSYNC   ;3

; move HMOVE after WSYNC? -- um, yes
       STA    HMOVE   ;3 DON'T FORGET TO HIT HMOVE!! or the object won't 
move
	   				  ;  horizontally.  I might have forgotten that for a while,
					  ;  causing nearly unbearable psychological pain.
etc etc etc
	
I'm attaching the updated code.  I think the joystick reading routine is 
pretty easy to follow, and the later demos also have joystick button 
presses handled.  Once I get frames of animation working for the 
players, I'll post an updated and HMOVE-fixed demo with better HMOVE 
hits.

Ruffin Bailey
http://myfreakinname.blogspot.com

Attachment: missileFixed.asm
Description: Binary data