Routines
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E8B3: test for line increment
Used by the routines at E6B6 and E716.
if at end of the line, but not at end of the last line, increment the cursor row
E8B3 A2 02 LDX #$02 set the count
E8B5 A9 27 LDA #$27 set the column
E8B7 C5 D3 CMP $D3 compare the column with the cursor column
E8B9 F0 07 BEQ $E8C2 if at end of line test and possibly increment cursor row
E8BB 18 CLC else clear carry for add
E8BC 69 28 ADC #$28 increment to the next line
E8BE CA DEX decrement the loop count
E8BF D0 F6 BNE $E8B7 loop if more to test
E8C1 60 RTS
cursor is at end of line
E8C2 A6 D6 LDX $D6 get the cursor row
E8C4 E0 19 CPX #$19 compare it with the end of the screen
E8C6 F0 02 BEQ $E8CA if at the end of screen just exit
E8C8 E6 D6 INC $D6 else increment the cursor row
E8CA 60 RTS
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