$FF5B/65371:   Initialize screen editor

Jump from $FCFB, $FF81:

FF5B: 20 18 E5  JSR $E518     ; Initialize I/O

Jump from $FF61:

FF5E: AD 12 D0  LDA $D012     ; VIC: Raster Position
FF61: D0 FB     BNE $FF5E
FF63: AD 19 D0  LDA $D019     ; VIC: Interrupt Request Register (IRR)
FF66: 29 01     AND #$01
FF68: 8D A6 02  STA $02A6     ; Flag: TV Standard
FF6B: 4C DD FD  JMP $FDDD     ; Enable Timer

Jump from $FDF6:

FF6E: A9 81     LDA #$81
FF70: 8D 0D DC  STA $DC0D     ; CIA1: Interrupt (IRQ) Control Register
FF73: AD 0E DC  LDA $DC0E     ; CIA1: Control Register A
FF76: 29 80     AND #$80
FF78: 09 11     ORA #$11
FF7A: 8D 0E DC  STA $DC0E     ; CIA1: Control Register A
FF7D: 4C 8E EE  JMP $EE8E     ; Serial Clock Off

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