RE: [stella] Math riddle : Loading TIM64T with 43 burns only 36 scanlines (not 37)

Subject: RE: [stella] Math riddle : Loading TIM64T with 43 burns only 36 scanlines (not 37)
From: Christian Bogey <khryssun@xxxxxxxx>
Date: Mon, 10 May 2004 20:56:06 +0200 (CEST)
Hi,

Erik Mooney wrote:

> Based on a quick test in PCAEWin's debugger, when
you
> store 43 into TIM64T, it *immediately* decrements to
> 42, then waits 64 cycles before decrementing to 41, 
> 40, and so on.

Oh yes !!! that should be the key. I spent all the
afternnon to make some tests and I found it worked
fine with 44 even if didn't understood why (I my count
it was 4 cycle too much (44*64 = 2816 instead of 37*76
= 2812). 

> (At least I believe this is the answer, although I
could be wrong. :) )

If the register decrement immediatly, I'am pretty sure
you are totally right !!! ;-)

THANKS !!!

Take care,
Chris



	

	
		
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