R60 Listing 3. Modified list output routine. It checks the¨ printer width byte in the environment. If the value is 0,¨ printer output is disabled by simply returning without¨ calling the real BIOS list output routine. -------------------------------------------------- PCOL EQU Z3ENV + 37H ; Address of width data ILIST: LD A,(PCOL) ; See if printer width is OR A ; ..set to 0 RET Z ; If so, just return LD A,15 ; Else, call BIOS JR DOBIOS