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Routines |
| Prev: E5B2 | Up: Map | Next: E5D0 |
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Used by the routines at Controls_CheckRight and Controls_CheckLeft.
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| Sound_Cursor | E5B3 | LD A,($D82F) | Load *CurrentCursor_X_Position into A. | |
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The value in C is used as a delay value.
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| E5B6 | RLCA | Multiply A by 20 and store the result in C. | ||
| E5B7 | RLCA | |||
| E5B8 | RLCA | |||
| E5B9 | RLCA | |||
| E5BA | LD C,A | |||
| E5BB | LD B,$64 | Set the number of sound loops in B. | ||
| E5BD | LD HL,$03E8 | In HL set a pointer to an arbitrary area in ZX Spectrum ROM. | ||
| Sound_Cursor_Loop | E5C0 | LD A,(HL) | Fetch the byte from ZX Spectrum ROM and store it in A. | |
| E5C1 | AND %00011000 | Keep only bits 3-4. | ||
| E5C3 | OR %00000101 | Set bits 0, 2. | ||
| E5C5 | OUT ($FE),A | Send to the speaker. | ||
| E5C7 | INC HL | Increment the ZX Spectrum memory byte pointer by one. | ||
| E5C8 | PUSH BC | Stash the sound loop counter on the stack. | ||
| E5C9 | LD B,C | Write the delay value from C into B. | ||
| Sound_Cursor_DelayLoop | E5CA | DJNZ Sound_Cursor_DelayLoop | Decrease the delay counter by one and loop back to Sound_Cursor_DelayLoop until the delay counter is zero. | |
| E5CC | POP BC | Restore the sound loop counter from the stack. | ||
| E5CD | DJNZ Sound_Cursor_Loop | Decrease the sound loop counter by one and loop back to Sound_Cursor_Loop until the sound loop counter is zero. | ||
| E5CF | RET | Return. | ||
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