- adc #7 / 2 ; Left or right half of 40-col column?
- ldx #<LOWSCR ; Columns 1,3,5..79
- bcs :+
- .assert LOWSCR + 1 = HISCR, error
- inx ; Columns 0,2,4..78
-: stx switch+1
+ adc #7 / 2 ; Left or right half of 40-col column?
+ ldx #<LOWSCR ; Columns 1,3,5..79
+ bcs :+
+ .assert LOWSCR + 1 = HISCR, error
+ inx ; Columns 0,2,4..78
+: stx switch+1