LDA $77
	BIT #$04
	BEQ .NotFlip
	LDA $16
	BIT #$80
	BEQ .NotFlip
	LDA #$02
	STA $066D
	LDA $96
	STA $1763
	STZ $1764
	REP #$20
	LDA #$0120
	SEC
	SBC $1763
	STA $96
	SEP #$20
	LDA #$FF
	STA $78
	.NotFlip
        LDA #$80
        TRB $16
        TRB $18
	RTS