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Routines |
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| PrintStringColour | B53D | PUSH HL | Stash HL on the stack. | |||||
| B53E | CALL ScreenAddress | Call ScreenAddress. | ||||||
| B541 | LD A,(DE) | Fetch the attribute byte. | ||||||
| B542 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| B543 | INC DE | Increment DE by one to point to the text of the string. | ||||||
| B544 | EXX | Switch to the shadow registers. | ||||||
| B545 | POP HL | Restore HL from the stack. | ||||||
| B546 | CALL AttributeAddress | Call AttributeAddress. | ||||||
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This entry point is used by the routine at MenuWriteText.
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| PrintString_Loop | B549 | EXX | Switch back to the normal registers. | |||||
| B54A | LD A,(DE) | Fetch the character to print. | ||||||
| B54B | BIT 7,A | If bit 7 is set (which signifies the end of the string), jump to PrintString_LastCharacter. | ||||||
| B54D | JR NZ,PrintString_LastCharacter | |||||||
| B54F | CALL PrintScreen | Call PrintScreen. | ||||||
| B552 | INC DE | Increment DE by one. | ||||||
| B553 | EXX | Switch to the shadow registers. | ||||||
| B554 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| B555 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| B556 | INC L | Increment L by one. | ||||||
| B557 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| B558 | JR PrintString_Loop | Jump to PrintString_Loop. | ||||||
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Because the last character contains the terminator, it needs to be handled separately.
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| PrintString_LastCharacter | B55A | AND %01111111 | Keep only bits 0-6 (i.e. strip the bit 7 terminator). | |||||
| B55C | CALL PrintScreen | Call PrintScreen. | ||||||
| B55F | EXX | Switch to the shadow registers. | ||||||
| B560 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| B561 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| B562 | RET | Return. | ||||||
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View the equivalent code in;
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