I’ve made a quick and dirty c64/BASIC PETSCII pattern tester/viewer.Its based on the two dither blocks and one modifier block. you can scroll *slowly* through the 128 blocks and the RVS ON counterparts in 8 configurations. It made was mostly to find any interesting combos.
Diagonals and Camel
D1/D2 MOD D1/D2
D2/D1 MOD D2/D1
D1/D2 RVSMOD D1/D2
D2/D1 RVSMOD D2/D1
I’m going to add the rest of the alternate pattern types at a later date. And make it ASM…