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EF19: Routine at $EF19
How does this get entered? $EE40 builds a JP $EF19 that's interrupt driven.
sub_ef19 EF19 PUSH AF Preserve registers
EF1A LD A,$FF Unlock the wait/spinlock -- Self modify 'LD A,x' @ dk_wait
EF1C LD ($EF14),A
EF1F POP AF Restore registers
EF20 EI Enable interrupts
EF21 RET Return
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