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Routines |
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Used by the routine at 34762.
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| 38622 | LD E,A | Save the value of A in E for later retrieval | ||||||
| 38623 | LD C,254 | We will output to port 254 | ||||||
| 38625 | LD D,A | Copy A into D; bits 0-2 of D determine the initial border colour | ||||||
| 38626 | RES 4,D | Reset bit 4 of D (initial speaker state) | ||||||
| 38628 | RES 3,D | Reset bit 3 of D (initial MIC state) | ||||||
| 38630 | LD B,E | Initialise B (delay counter for the inner loop) | ||||||
| 38631 | CP B | Is it time to flip the MIC and speaker and make the border black? | ||||||
| 38632 | JR NZ,38636 | Jump if not | ||||||
| 38634 | LD D,24 | Set bits 3 (MIC) and 4 (speaker) of D, and reset bits 0-2 (black border) | ||||||
| 38636 | OUT (C),D | Set the MIC state, speaker state and border colour | ||||||
| 38638 | DJNZ 38631 | Jump back until the inner loop is finished | ||||||
| 38640 | DEC A | Is the outer loop finished too? | ||||||
| 38641 | JR NZ,38625 | Jump back if not | ||||||
| 38643 | RET | |||||||
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