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Routines |
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| PrintString | 29036 | PUSH HL | Stash HL on the stack. | |||||
| 29037 | CALL ScreenAddress | Call ScreenAddress. | ||||||
| 29040 | LD A,(DE) | Fetch the attribute byte. | ||||||
| 29041 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 29042 | INC DE | Increment DE by one to point to the text of the string. | ||||||
| 29043 | EXX | Switch to the shadow registers. | ||||||
| 29044 | POP HL | Restore HL' from the stack. | ||||||
| 29045 | CALL AttributeAddress | Call AttributeAddress. | ||||||
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This entry point is used by the routine at PrintMenuItem.
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| PrintString_Loop | 29048 | EXX | Switch back to the normal registers. | |||||
| 29049 | LD A,(DE) | Fetch the character to print. | ||||||
| 29050 | BIT 7,A | If bit 7 is set (which signifies the end of the string), jump to PrintString_LastCharacter. | ||||||
| 29052 | JR NZ,PrintString_LastCharacter | |||||||
| 29054 | CALL PrintScreen | Call PrintScreen. | ||||||
| 29057 | INC DE | Increment DE by one. | ||||||
| 29058 | EXX | Switch to the shadow registers. | ||||||
| 29059 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 29060 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| 29061 | INC L | Increment L by one. | ||||||
| 29062 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 29063 | 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 | 29065 | AND %01111111 | Keep only bits 0-6 (i.e. strip the bit 7 terminator). | |||||
| 29067 | CALL PrintScreen | Call PrintScreen. | ||||||
| 29070 | EXX | Switch to the shadow registers. | ||||||
| 29071 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 29072 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| 29073 | RET | Return. | ||||||
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View the equivalent code in;
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