Routines
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41459: Print Colour String
Used by the routines at GameMenu, GameOver, GameStats and GameComplete.
Prints a string of characters, and sets the attribute of each character cell it uses. The string data starts with the attribute, followed by the characters, and bit 7 of the last character is set to mark the end of the string.
Before After
print-string-before print-string-after
Input
DE Pointer to string data
HL The position (the Y position in H and the X position in L)
PrintStringColour 41459 PUSH HL Stash HL on the stack.
41460 CALL ScreenAddress Call ScreenAddress to get the screen address.
41463 LD A,(DE) Fetch the attribute byte.
41464 EX AF,AF' Switch to the shadow AF register.
41465 INC DE Increment DE by one to point to the text of the string.
41466 EXX Switch to the shadow registers.
41467 POP HL Restore HL from the stack.
41468 CALL AttributeAddress Call AttributeAddress to get the attribute address.
This entry point is used by the routine at MenuWriteText.
PrintString_Loop 41471 EXX Switch back to the normal registers.
41472 LD A,(DE) Fetch the character to print.
41473 BIT 7,A If bit 7 is set (which signifies the end of the string), jump to PrintString_LastCharacter.
41475 JR NZ,PrintString_LastCharacter
41477 CALL PrintScreen Call PrintScreen to print the character.
41480 INC DE Move DE on to the next character of the string.
41481 EXX Switch to the shadow registers.
41482 EX AF,AF' Switch to the shadow AF register.
41483 LD (HL),A Copy the attribute byte to the screen.
41484 INC L Move L on to the next attribute cell.
41485 EX AF,AF' Switch to the shadow AF register.
41486 JR PrintString_Loop Jump back to PrintString_Loop to print the next character of the string.
Because the last character contains the terminator, it needs to be handled separately.
PrintString_LastCharacter 41488 AND %01111111 Keep only bits 0-6 (i.e. strip the bit 7 terminator).
41490 CALL PrintScreen Call PrintScreen to print the character.
41493 EXX Switch to the shadow registers.
41494 EX AF,AF' Switch to the shadow AF register.
41495 LD (HL),A Copy the attribute byte to the screen.
41496 RET Return.
View the equivalent code in;
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