|
Routines |
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| 72D2 | LD DE,($7F64) | Copy the speech bubble lip coordinates from 7F64 to DE | ||
| 72D6 | LD A,E | Now E holds the x-coordinate of the left edge of the speech bubble | ||
| 72D7 | AND $F8 | |||
| 72D9 | LD E,A | |||
| 72DA | LD A,($7F00) | A=leftmost column of the skool on screen (0-64) | ||
| 72DD | SUB E | Is the speech bubble at the far left of the screen? | ||
| 72DE | JR Z,$72EA | Jump if so | ||
| 72E0 | CCF | Return with the carry flag set if the speech bubble is off-screen to the left | ||
| 72E1 | RET C | |||
| 72E2 | CP $E1 | Return with the carry flag set if the speech bubble is off-screen to the right | ||
| 72E4 | RET C | |||
| 72E5 | NEG | A=1, 2 or 3 (corresponding to the quadrant of the screen containing the speech bubble) | ||
| 72E7 | RRCA | |||
| 72E8 | RRCA | |||
| 72E9 | RRCA | |||
| 72EA | LD E,A | E=0-3 (quadrant of the screen containing the speech bubble) | ||
| 72EB | LD A,D | Point DE at the byte of the screen refresh buffer corresponding to the top row of the speech bubble | ||
| 72EC | SUB $97 | |||
| 72EE | ADD A,A | |||
| 72EF | ADD A,A | |||
| 72F0 | ADD A,E | |||
| 72F1 | LD E,A | |||
| 72F2 | LD D,$7F | |||
| 72F4 | LD A,(DE) | Set bits 1-6 of this screen refresh buffer byte (so that the part of the screen hidden by the middle 6 UDGs of the top row of the speech bubble will be refreshed) | ||
| 72F5 | OR $7E | |||
| 72F7 | LD (DE),A | |||
| 72F8 | LD A,E | Point DE at the byte of the screen refresh buffer corresponding to the bottom row of the speech bubble | ||
| 72F9 | ADD A,$04 | |||
| 72FB | LD E,A | |||
| 72FC | LD A,(DE) | Set bits 1-6 of this screen refresh buffer byte (so that the part of the screen hidden by the middle 6 UDGS of the bottom row of the speech bubble will be refreshed) | ||
| 72FD | OR $7E | |||
| 72FF | LD (DE),A | |||
| 7300 | RET | Return with the carry flag reset | ||
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