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Routines |
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| 27419 | LD (54795),DE | Save the message address in bytes 11 and 12 of the character buffer in page 214 | ||||||||
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This entry point is used by the routine at 27462 to write the second line of text into the message box graphic buffer at 58408.
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| 27423 | PUSH HL | Copy the buffer address to HL' | ||||||||
| 27424 | EXX | |||||||||
| 27425 | POP HL | |||||||||
| 27426 | LD BC,0 | B=0 (during startup) or 64, C=0 (this instruction is set to LD BC,16384 before the game starts; see 21408) | ||||||||
| 27429 | LD (HL),C | Create 64 (or 256) empty pixel columns in the buffer | ||||||||
| 27430 | INC HL | |||||||||
| 27431 | DJNZ 27429 | |||||||||
| 27433 | DEC HL | |||||||||
| 27434 | EXX | |||||||||
| 27435 | LD H,214 | We are using the character buffer in page 214 to process the message | ||||||||
| 27437 | LD C,255 | The message box is 255 (during startup) or 64 pixels wide (this instruction is set to LD C,64 before the game starts; see 21408) | ||||||||
| 27439 | CALL 26318 | A=ASCII code of the next character in the message | ||||||||
| 27442 | CP 3 | Is the ASCII code 0, 1 or 2 (end of line)? | ||||||||
| 27444 | JR C,27451 | Jump if so to centre the text | ||||||||
| 27446 | CALL 27110 | Slide the bitmap for CHR$(A) into the buffer | ||||||||
| 27449 | JR 27439 | Jump back to do the next character | ||||||||
| 27451 | SRL C | Now C=half the number of unused pixel columns left in the buffer | ||||||||
| 27453 | RET Z | Return if this is zero (the buffer is full) | ||||||||
| 27454 | CALL 27124 | Create C empty pixel columns in the buffer, thus centring the message | ||||||||
| 27457 | DEC C | |||||||||
| 27458 | JR NZ,27454 | |||||||||
| 27460 | RET | |||||||||
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