I see my problem with positioning my sprites horizontally now.
When I looked at the log produced by Z26 to determine my scan line count
I noticed that I was setting HMP1 to #$00 on the 20th cycle. The Stella
Programming Guide mentions that these registers should not be modified
for at least 24 cycles after HMOVE. I repositioned the call until later
and now the sprites move smoothly :)
I also see that my kernel is producing more scan lines than I thought.
I'll have to spend a little more time investigating this.
Thanks for all of your help :)
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