Re: [stella] TIA VSYNC and VBLANK

Subject: Re: [stella] TIA VSYNC and VBLANK
From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx>
Date: Tue, 5 Oct 2004 08:30:19 -0700 (PDT)
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On Tue, 5 Oct 2004, Thomas Jentzsch wrote:
> Adam Wozniak wrote:
> > This may sound dumb, but what is the difference between the two?
> 
> VBLANK simply disables the display of all objects (incl. the background!).
> 
> VSYNC is used for controlling the vertical snyc, which defines the framerate.

So would it be correct to say:

VBLANK forces the TIA L0,L1,and L2 outputs to zero/ground, and the COL output
to zero degrees phase shift.

VSYNC is used to generate the composite sync output SYN.  (how, exactly?
is SYN simply VSYNC xor'd with the horizontal blank?)

- -- 
adam@xxxxxxxxxxxxxxxx        http://cuddlepuddle.org/~adam
KG6GZR                       http://cuddlepuddle.org/~adam/resume.html
"You think grown-ups have it all figured out? That's just a hustle,
kid. Grown-ups are making it up as they go along just like you. You
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