Routines
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FF5B: initialise VIC and screen editor
Used by the routines at FCE2 and FF81.
FF5B 20 18 E5 JSR $E518 initialise the screen and keyboard
FF5E AD 12 D0 LDA $D012 read the raster compare register
FF61 D0 FB BNE $FF5E loop if not raster line $00
FF63 AD 19 D0 LDA $D019 read the vic interrupt flag register
FF66 29 01 AND #%00000001 mask the raster compare flag
FF68 8D A6 02 STA $02A6 save the PAL/NTSC flag
FF6B 4C DD FD JMP $FDDD
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