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Text File  |  2022-09-20  |  521b  |  14 lines
  1.  
  2.       SEI                 ; Set interrupt Disable Flag
  3.       LDA #<NEWIRQ        ; Get low-byte of NEWIRQ routine
  4.       STA $0314           ; Store in RAM vector
  5.       LDA #>NEWIRQ        ; Get low-byte of NEWIRQ routine
  6.       STA $0315           ; Store in RAM vector
  7.       CLI                 ; Clear Interrupt Disable Flag
  8.       RTS                 ; Done
  9.  NEWIRQ
  10.       INC $05A4           ; Increment character at center of
  11.                           ; screen
  12.       JMP $EA31           ; Jump to regular IRQ routine
  13.  
  14.