## Re: [stella] why -68?

 Subject: Re: [stella] why -68? From: ben Date: Wed, 07 Nov 2001 22:07:19 +1100
At 08:49 AM 11/6/2001 -0800, you wrote:
>You should thank Eckhard too.  He's been doing most of the work for the last
>couple of years.

Thanks Eckhard :)

>In any case, we start counting TIA cycles at -68 because that's how PCAE
>does it.  We wanted to make it easy to compare results between z26 and PCAE.
>When working on an emu, it's very handy to be able to compare with other
>ones.  But this way TIA starts drawing at cycle 0.
>
>Yes there are 228 cycles per scanline.  160 - (-68) = 228.  But the last
>cycle you'll ever see is 157.  160 would put it at the beginning of the next
>scanline.  At least that's what I think it should do.

All makes perfect sense.  I was a little worried that there were not
exactly 228 cycles per line, so thanks for clearing it up.

Ben

PS: Dont do complex maths (157 + 68) after midnight, otherwise you'll end
up with 236 ;)

----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/