Routines
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BE37: Print Character
Used by the routines at PrintString, PrintStringAndNewline, Handler_UserInput, UserInput_Enter, Handler_DisplayRoom and PrintInputPrompt.
Print one character, scrolling the text window when the cursor reaches its edge.
Input
A Character to print
PrintCharacter BE37 PUSH AF Keep the character safe on the stack.
BE38 LD A,($5C89) Jump to PrintCharacterDirect if the line byte of S_POSN (5C89) is not row 03.
BE3B CP $03
BE3D JR NZ,PrintCharacterDirect
BE3F POP AF Restore the character from the stack, leaving a copy.
BE40 PUSH AF
BE41 CP $0D Jump to CheckColumnPosition if this is not a newline (0D).
BE43 JR NZ,CheckColumnPosition
A newline scrolls the text window and prints nothing.
BE45 CALL ScrollScreen Call ScrollScreen.
BE48 POP AF Discard the character from the stack.
BE49 RET Return.
Check the column.
CheckColumnPosition BE4A LD A,($5C88) Call ScrollScreen if *S_POSN is column 01.
BE4D CP $01
BE4F CALL Z,ScrollScreen
Print the character.
PrintCharacterDirect BE52 POP AF Restore the character from the stack.
BE53 RST $10 Print it with PRINT_A_1.
BE54 RET Return.
View the equivalent code in;
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