[stella] Earliest safe write to PF1 for asymmetrical playfield?

[Thomas Jentzsch]

Rob Mundschau wrote:
> I have noticed some PF1 artifacts when I play Thrust Platinum on my
> 7800.  Is that write happening at cycle 37?  Does it need to be cycle
> 38 for some 7800 systems?

I haven't invested this much deeper, since I have no system to test
it, but Dennis should be right. It has to be a too late write to PF2
(ends at cycle 38). All other writes seem uncritical.

This late write only happens when the cave opening is completely in
the left part of the screen. So maybe you or Dennis can confirm this
with your 7800?

BTW: I am using the non reflected PF mode.

Have fun!
Thomas                            
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