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Routines |
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Used by the routines at WipeViewOut and WipeViewIn.
Draws one step of the wipe, by finding the address in the screen buffer with GetBufferAddress and then waiting for the next frame and copying the picture to the screen.
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| DrawWipeStep | 58503 | LD H,A | A moves into H. | |||||
| 58504 | LD L,16 | L is 16. | ||||||
| 58506 | LD (23770),SP | Write SP at SavedStackPointer. | ||||||
| 58510 | CALL GetBufferAddress | Call GetBufferAddress. | ||||||
| 58513 | HALT | Wait for the next frame. | ||||||
| 58514 | DI | Disable interrupts. | ||||||
| 58515 | LD SP,HL | HL moves into SP. | ||||||
| 58516 | LD DE,584 | DE is 584. | ||||||
| DrawWipeStep_Loop | 58519 | DEC DE | Step DE back. | |||||
| 58520 | LD A,D | D moves into A. | ||||||
| 58521 | OR E | Combine A with E. | ||||||
| 58522 | JR NZ,DrawWipeStep_Loop | Jump to 58519 if the zero flag is reset. | ||||||
| 58524 | LD A,(23768) | Read the byte at ScratchValue. | ||||||
| 58527 | ADD A,135 | Add 135. | ||||||
| 58529 | CPL | Invert the bits of A. | ||||||
| 58530 | LD B,A | A moves into B. | ||||||
| 58531 | JP UpdateScreen_Copy | Jump to UpdateScreen_Copy. | ||||||
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