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Routines |
| Prev: 698E | Up: Map | Next: 6A17 |
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Called from the main loop at 6229.
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| 69A4 | LD HL,($7CC4) | Pick up the bell's location in the current maze. | ||
| 69A7 | LD A,H | Has Horace already sounded the alarm? | ||
| 69A8 | OR L | |||
| 69A9 | JR NZ,$69D0 | Jump if not. | ||
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Horace has already sounded the alarm. Produce an appropriate delay in place of the bell sound.
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| 69AB | LD A,($7C62) | Pick up the game speed parameter in A. | ||
| 69AE | LD E,A | HL=350+30*A. | ||
| 69AF | LD HL,$015E | |||
| 69B2 | LD BC,$001E | |||
| 69B5 | ADD HL,BC | |||
| 69B6 | DEC E | |||
| 69B7 | JR NZ,$69B2 | |||
| 69B9 | XOR A | Clear A for no apparent reason. | ||
| 69BA | LD A,($6B0A) | Pick up the active guard counter (0-3) in A. | ||
| 69BD | RLA | Subtract 128*A from HL. | ||
| 69BE | RLA | |||
| 69BF | RLA | |||
| 69C0 | RLA | |||
| 69C1 | RLA | |||
| 69C2 | RLA | |||
| 69C3 | LD B,$00 | |||
| 69C5 | LD C,A | |||
| 69C6 | SBC HL,BC | |||
| 69C8 | SBC HL,BC | |||
| 69CA | PUSH HL | Copy HL to BC. | ||
| 69CB | POP BC | |||
| 69CC | CALL $6B0C | Wait for 26*BC+5 T states. | ||
| 69CF | RET | |||
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Horace has not sounded the alarm yet. Produce an appropriate bell sound if necessary.
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| 69D0 | LD A,($7CC6) | Pick up the bell animation frame counter. | ||
| 69D3 | AND $3F | Keep only bits 0-5. | ||
| 69D5 | CP $00 | Is the frame counter a multiple of 64 at the moment? (This instruction is redundant.) | ||
| 69D7 | JR NZ,$69F6 | Jump if not. | ||
| 69D9 | LD HL,$7C69 | Pick up the sound on/off indicator in A. | ||
| 69DC | LD A,(HL) | |||
| 69DD | CP $1F | Is the sound on? | ||
| 69DF | JR NZ,$69AB | Jump if not. | ||
| 69E1 | LD DE,$0016 | Call the ROM to make a short sound effect. | ||
| 69E4 | LD HL,$0193 | |||
| 69E7 | CALL $03B5 | |||
| 69EA | DI | Disable interrupts after the ROM call. | ||
| 69EB | LD DE,$001A | Call the ROM again to make another short sound effect. | ||
| 69EE | LD HL,$0168 | |||
| 69F1 | CALL $03B5 | |||
| 69F4 | DI | Disable interrupts after the ROM call. | ||
| 69F5 | RET | |||
| 69F6 | CP $20 | Is the bell animation frame counter a multiple of 32 at the moment? | ||
| 69F8 | JR NZ,$69AB | Jump if not. | ||
| 69FA | LD HL,$7C69 | Pick up the sound on/off indicator in A. | ||
| 69FD | LD A,(HL) | |||
| 69FE | CP $1F | Is the sound on? | ||
| 6A00 | JR NZ,$69AB | Jump if not. | ||
| 6A02 | LD DE,$001A | Call the ROM to make a short sound effect. | ||
| 6A05 | LD HL,$0168 | |||
| 6A08 | CALL $03B5 | |||
| 6A0B | DI | Disable interrupts after the ROM call. | ||
| 6A0C | LD DE,$0016 | Call the ROM again to make another short sound effect. | ||
| 6A0F | LD HL,$0193 | |||
| 6A12 | CALL $03B5 | |||
| 6A15 | DI | Disable interrupts after the ROM call. | ||
| 6A16 | RET | |||
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