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Routines |
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| PrintString | 73ED | PUSH HL | Stash HL on the stack. | |||||
| 73EE | CALL ScreenAddress | Call ScreenAddress. | ||||||
| 73F1 | LD A,(DE) | Fetch the attribute byte. | ||||||
| 73F2 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 73F3 | INC DE | Increment DE by one to point to the text of the string. | ||||||
| 73F4 | EXX | Switch to the shadow registers. | ||||||
| 73F5 | POP HL | Restore HL' from the stack. | ||||||
| 73F6 | CALL AttributeAddress | Call AttributeAddress. | ||||||
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This entry point is used by the routine at MenuWriteText.
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| PrintString_Loop | 73F9 | EXX | Switch back to the normal registers. | |||||
| 73FA | LD A,(DE) | Fetch the character to print. | ||||||
| 73FB | BIT 7,A | If bit 7 is set (which signifies the end of the string), jump to PrintString_LastCharacter. | ||||||
| 73FD | JR NZ,PrintString_LastCharacter | |||||||
| 73FF | CALL PrintScreen | Call PrintScreen. | ||||||
| 7402 | INC DE | Increment DE by one. | ||||||
| 7403 | EXX | Switch to the shadow registers. | ||||||
| 7404 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 7405 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| 7406 | INC L | Increment L by one. | ||||||
| 7407 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 7408 | 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 | 740A | AND %01111111 | Keep only bits 0-6 (i.e. strip the bit 7 terminator). | |||||
| 740C | CALL PrintScreen | Call PrintScreen. | ||||||
| 740F | EXX | Switch to the shadow registers. | ||||||
| 7410 | EX AF,AF' | Switch to the shadow AF register. | ||||||
| 7411 | LD (HL),A | Copy the attribute byte to the screen. | ||||||
| 7412 | RET | Return. | ||||||
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