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BBC Micro Elite

Drawing circles: DOHFX (6502SP version)

Name: DOHFX [View in context] Type: Subroutine Category: Drawing circles Summary: Implement the #DOHFX <flag> command (update the hyperspace effect flag)
This routine is run when the parasite sends a #DOHFX <flag> command. It updates the hyperspace effect flag in HFX. Arguments: A The new value of the hyperspace effect flag: * 0 = no colour effect * Non-zero = enable hyperspace colour effect
.DOHFX STA HFX \ Store the new hyperspace effect flag in HFX JMP PUTBACK \ Jump to PUTBACK to restore the USOSWRCH handler and \ return from the subroutine using a tail call