highly unstable: involves a 'magic' constant that depends on temperature, the chip series, and maybe other factors.
Turrican 3 on C64 requires a different magic constant than $EE for ANE. $EF is recommended by Groepaz (VICE team)
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| ARR || || 6B (2) || || || || || || || || || N || V || - || - || - || Z || C || A AND oper, C -> [76543210] -> C || AND oper + ROR