{slcharasm2{bt›LISTING THREE›-------------›››; Display List Interrupt service routine›; Changes Character Base Pointer before text window is displayed››WSYNC EQU $D40A ; Wait for horizontal synchronization register›CHBASE EQU $D409 ; Character Base Pointer register›› PHA ; Save accumulator for return to normal processing› LDA #$E0 ; Hibyte of ROM character set starting address› STA WSYNC ; Wait for proper synchroniztion› STA CHBASE ; Now put the new character base into ANTIC› PLA ; Restore accumulator› RTI ; All done, so go back to noraml execution››{et›