Routines
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C9EF: Print String
Used by the routine at DisplayMenu.
Prints a string in the main font, at a position given in pixels measured from the bottom left of the screen. The string ends with a character that has bit 7 set. The attribute for the whole string is in AF', unless the string is printed by entering at PrintStringWithAttribute, which takes the attribute from the first byte of the string.
After PrintString
print-string
Input
A' Attribute
DE Address of the string
HL Position (X in L, Y in H)
Set the font and find the screen address.
PrintString C9EF PUSH HL Stash the position on the stack.
C9F0 LD HL,$6B5E Write 6B5E to FontPointer.
C9F3 LD ($BBAC),HL
C9F6 POP HL Restore the position from the stack.
C9F7 CALL CalculateScreenAddress Call CalculateScreenAddress.
C9FA JR PrintString_Loop Jump to PrintString_Loop.
This entry point is used by the routines at StartGame and GameOver.
Prints a string that starts with an attribute.
PrintStringWithAttribute C9FC PUSH HL Stash the position on the stack.
C9FD LD HL,$6B5E Write 6B5E to FontPointer.
CA00 LD ($BBAC),HL
CA03 POP HL Restore the position from the stack.
CA04 CALL CalculateScreenAddress Call CalculateScreenAddress.
CA07 LD A,(DE) Fetch the attribute.
CA08 INC DE Move on to the string.
CA09 EX AF,AF' Keep the attribute in AF'.
Print each character of the string.
PrintString_Loop CA0A LD A,(DE) Fetch the next character.
CA0B INC DE Move on to the next character.
CA0C BIT 7,A Jump to PrintString_Last if it is the last one.
CA0E JR NZ,PrintString_Last
CA10 CALL PrintCharacterWithAttribute Call PrintCharacterWithAttribute.
CA13 INC L Move on to the next position.
CA14 JR PrintString_Loop Jump to PrintString_Loop.
Print the last character.
PrintString_Last CA16 AND %01111111 Keep bits 0 to 6.
CA18 JP PrintCharacterWithAttribute Jump to PrintCharacterWithAttribute.
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