50     CDTMV2=$021A;THE COUNTDOWN FOR TIMER #2›60     CDTMA2=0228;VECTOR FOR TIME #2›70     INDEX=$0630;1584›80       PTR=$0631;1585›90    DLBYTE=$0666;DUMMY›0100  *=$0600     ;START PAGE 6›0110  PLA         ;POP THE NUMBER OF ARGS. OFF THE STACK›0120  LDA #$0B    ;LO BYTE OF TIMER ROUTINE›0130  STA CDTMA2  ;PUT IN LO BYTE OF VECTOR›0140  LDA #$06    ;HI BYTE OF TIMER ROUTINE›0150  STA CDTMA2+1;PUT IN HI BYTE OF VECTOR›0160  CLD         ;DO THIS OR BASIC WILL FOUL UP›0165              ;YOUR ARITHMETIC›0170  LDA INDEX   ;KEEPS TRACK OF WHICH SCREEN YOUR ON›0180  CLC›0190  ADC #4      ;POINT TO NEXT SCREEN (EACH SCREEN IS›0200              ;4 PAGES LONG)›0210  CMP #12     ;TIME TO DISPLAY FIRST SCREEN AGAIN?›0220  BNE RESET   ;NO, GO DISPLAY 2ND OR 3RD SCREEN›0230  LDA #0      ;YES, ZERO OUT INDEX›0240 RESET STA INDEX ;STORE IT›0250  LDA PTR     ;PTR CONTAINS HI BYTE OF FIRST SCREEN ADDRESS›0260  CLC›0270  ADC INDEX   ;ACC NOW CONTAINS HI BYTE OF ADDRESS›0275              ;OF NEXT SCREEN›0280  STA DLBYTE  ;DLBYTE WAS SET TO$0666 IN THE EQUATES›0290              ;BUT THE BASIC PROGRAM REPLACES THE TWO›0300              ;NUMBERS HERE WITH THE LO AND HI BYTES›0310              ;OF THE DISPLAY LIST HI LMS BYTE ADDRESS›0320              ;SO WE ARE STORING THE HI BYTE  OF THE NEXT›0330              ;SCREEN INTO THE LMS HI BYTE,›0335              ;THUS DISPLAYING IT!›0340  LDA #$02    ;RELOAD THE COUNTDOWN TIMER›0350  STA CDTMV2›0360  RTS         ;ALL DONE›