[stella] RFC: What happens when changing HM registers within 24cycles of HMOVE?

[Dennis Debro]

Hi there,

> Can anyone describe exactly what happens when modifying HMP0, HMPl,
> HMM0, HMMl and HMBL within 24 cycles of an HMOVE?  Ideally I'd like a
> short description of the behaviour, and any other registers that might
> be affected.

I believe Andrew Towers spelled it out in his TIA Hardware Notes. It can be
found here http://atari2600.org/pipermail/stella/2003-March/012962.html.

Look in the section titled "Playing with the HMOVE registers". I hope this
helps.

Take care,
Dennis