Routines
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35345: Print Colour String
Print a bit-7-terminated string using the attribute byte stored in front of the text.
Input
DE Pointer to string data
HL Pixel address co-ordinates
PrintStringColour 35345 PUSH HL Stash HL on the stack.
35346 CALL ScreenAddress Call ScreenAddress.
35349 LD A,(DE) Fetch the attribute byte.
35350 EX AF,AF' Switch to the shadow AF register.
35351 INC DE Increment DE by one to point to the text of the string.
35352 EXX Switch to the shadow registers.
35353 POP HL Restore HL from the stack.
35354 CALL AttributeAddress Call AttributeAddress.
Print each character with its attribute until the string terminator is reached.
PrintString_Loop 35357 EXX Switch back to the normal registers.
35358 LD A,(DE) Fetch the character to print.
35359 BIT 7,A Jump to PrintString_LastCharacter if bit 7 is set (end of the string).
35361 JR NZ,PrintString_LastCharacter
35363 CALL PrintScreen Call PrintScreen.
Move to the next character and write this cell's attribute.
35366 INC DE Increment DE by one.
35367 EXX Switch to the shadow registers.
35368 EX AF,AF' Switch to the shadow AF register.
35369 LD (HL),A Copy the attribute byte to the screen.
35370 INC L Increment L by one.
35371 EX AF,AF' Switch to the shadow AF register.
35372 JR PrintString_Loop Jump to PrintString_Loop.
Because the last character contains the terminator, it needs to be handled separately.
PrintString_LastCharacter 35374 AND %01111111 Keep only bits 0-6 (i.e. strip the bit 7 terminator).
35376 CALL PrintScreen Call PrintScreen.
35379 EXX Switch to the shadow registers.
35380 EX AF,AF' Switch to the shadow AF register.
35381 LD (HL),A Copy the attribute byte to the screen.
35382 RET Return.
View the equivalent code in;
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