[stella]Re: My demo fixed?, PAL, NTSC :-?

[henitrope@xxxxxxxx]

"Z26 counts the number of scan lines before the next frame." 

L O L ! That makes sense to me now! I was indeed "braindead"  :-D

Thanks for your help Dennis ( and the others who reponded ) ! I
appreciate it. I actually modelled my VerticalSync routine based on yours
in Climber05 so that's why I had a 200 scanline count. Until now, I
thought that "43" and "44" were the ONLY magic numbers to use to set up
timing!

( Actually, every hitchiker knows that the answer to everything is "42" )
  ;-)

Okay, after another all-nighter, I think I got it working now. In z26, I
got both screens to say "262 " lines in NTSC and "312" in PAL after I
fixed my constant variables and added more to Overscan.

If you guys out there with CCs or Superchargers can give my demo another
whirl, hopefully it works fine now on the real thing.
The latest is attached above.

Thank you in advance! :-)

- Weston


On Mon, 24 Mar 2003 18:42:55 -0500 Dennis Debro <ddebro@xxxxxxxxxxxxx>
writes:
> Hi,
>  
> > This sounds illogical! My current values: NTSC VBLANK: $01( 1 
> count X
> > TIM64T ), IIRC, this gave my 202 lines. I haven't changed PAL 
> VBLANK yet.
> > NTSC overscan: also $01!
> 
> So that says your kernel is ~200 scan lines. 
> 
> > VBLANK is supposed to be 43 or 44 x TIM64T, right? So my current 
> values
> > should cause the screen in z26 to ROLL, right?
> 
> That depends. If you're going for a 200 scan line kernel you will 
> have adjust your vertical blank and overscan lines accordingly. For 
> example, Climber 5 has 200 scan lines for the kernel. To stay within 
> the 262 scan lines for an NTSC display I chopped 4 lines off 
> vertical blank and overscan time.
> 
> > Does z26 show NTSC 192 lines or does it "display" all 262 lines?
> 
> Z26 counts the number of scan lines before the next frame.
> 
> I hope this helps you.
> 
> Take care,
> Dennis
> 
>
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