Routines
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25842: Print Character
Used by the routines at PrintString, PrintStringAndANewline, Handler_UserInput, Parser_MatchInputWord, Handler_DisplayRoom and PrintInputPrompt.
Print a character, scrolling when the cursor reaches the bottom of the text area.
Input
A Character to print
PrintCharacter 25842 PUSH AF Preserve the character to print.
25843 LD A,(23689) Jump to PrintCharacter_Step2 when the cursor row in S_POSN is not 3.
25846 CP 3
25848 JR NZ,PrintCharacter_Step2
25850 POP AF Restore the character from the stack, keeping a copy there.
25851 PUSH AF
25852 CP 13 Jump to PrintCharacter_Step1 when this is not a newline (13).
25854 JR NZ,PrintCharacter_Step1
A newline scrolls the text area.
25856 CALL ScrollScreen Call ScrollScreen to scroll the screen.
25859 POP AF Discard the character. A newline only scrolls.
25860 RET Return.
Check the column position.
PrintCharacter_Step1 25861 LD A,(23688) Call ScrollScreen to scroll when the column in S_POSN is 1.
25864 CP 1
25866 CALL Z,ScrollScreen
PrintCharacter_Step2 25869 POP AF Restore the character to print from the stack.
Print the character.
25870 RST 16 Print the character with PRINT_A_1.
25871 RET Return.
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