Multisprite Kernel Trick: Mirrored but same sided Playfield

[+Gemintronic]

If you use this value:

 

CTRLPF = $30

you can have the other half of the screen be same sided as the other half.

 

[+Random Terrain]

Does the first number always have to be three? In other words, is the magic in the three and the zero or is the magic only in the zero?

[+Gemintronic]

Does the first number always have to be three? In other words, is the magic in the three and the zero or is the magic only in the zero?

 

My hunch is that this is a hardware feature but undocumented in batari BASIC. So, it's probably a particular bit in CTRLPF that does this in the multisprite kernel. Too burnt out from my current project to pursue this

[alex_79]

Does the first number always have to be three? In other words, is the magic in the three and the zero or is the magic only in the zero?

 

 

It's the zero. The least significant bit of CTRLPF register controls PF reflection, so actually any EVEN value will have that effect.

Edited February 18, 2015 by alex_79