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hardware:music_processor [2016/06/14 00:33] ex_writer [MUZCPU Instruction Set] |
hardware:music_processor [2016/06/14 09:01] (current) ex_writer [Port Summary] |
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| | 1 | QUIET | | Stops music and sets volume = 0 | | | 1 | QUIET | | Stops music and sets volume = 0 | | ||
| | 2 | OUTPUT | p,d | Port #(0–7), Data | | | 2 | OUTPUT | p,d | Port #(0–7), Data | | ||
| - | | 9 | OUTPUT | SNDBX,D10,D11,D12,D13,D14,D15,D16,D17 | Sound block transfer for all 8 output ports | | + | | 9 | OUTPUT | SNDBX,D10,D11,D12,D13,D14,D15,D16,D17 | Sound block transfer for all 8 output ports via SNDBX ($18) | |
| | 3 | VOLUME | VOLAB, VOLC | Sets volume Tones A–C | | | 3 | VOLUME | VOLAB, VOLC | Sets volume Tones A–C | | ||
| | 1 | PUSHN | | Push # between 1-16 onto the stack | | | 1 | PUSHN | | Push # between 1-16 onto the stack | | ||
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| <WRAP round info>The port numbers (0–7) passed to OUTPUT assume that output port $10 (VOLMO) is the "base" port (i.e., port $0). Port numbers are offset from that base. For example, to set Tone B's frequency to $82, one would call OUTPUT $02,$82. This would store the value $82 in output port $12 (TONEB).</WRAP> | <WRAP round info>The port numbers (0–7) passed to OUTPUT assume that output port $10 (VOLMO) is the "base" port (i.e., port $0). Port numbers are offset from that base. For example, to set Tone B's frequency to $82, one would call OUTPUT $02,$82. This would store the value $82 in output port $12 (TONEB).</WRAP> | ||
| - | <WRAP round help>Testing:\\ * PUSHN creates a loop index that DSJNZ decrements until zero (for looping music sections)?\\ * What does CREL do?\\ * Why NOTE4 and NOTE5?</WRAP> | + | <WRAP round help>Testing:\\ * PUSHN creates a loop index that DSJNZ decrements until zero (for looping music sections)?\\ * What does CREL do?\\ * Why NOTE4 and NOTE5? (Dogpatch uses NOTE4)</WRAP> |
| ===== Master Oscillator ===== | ===== Master Oscillator ===== | ||
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| The tone volumes are controlled by output ports $15 (VOLC) and $16 (VOLAB). The lower 4 bits of port $16 set Tone A volume, the upper 4 bits set Tone B volume. The lower 4 bits of port $15 set Tone C volume. Noise can be mixed with the tones by setting bit 5 of port $15 to 1. In this case, the noise volume is given by the upper 4 bits of port $17 (VOLN). In all cases, a volume of 0 is silence and a volume of all 1's is loudest. | The tone volumes are controlled by output ports $15 (VOLC) and $16 (VOLAB). The lower 4 bits of port $16 set Tone A volume, the upper 4 bits set Tone B volume. The lower 4 bits of port $15 set Tone C volume. Noise can be mixed with the tones by setting bit 5 of port $15 to 1. In this case, the noise volume is given by the upper 4 bits of port $17 (VOLN). In all cases, a volume of 0 is silence and a volume of all 1's is loudest. | ||
| - | === Port Summary === | + | === Music Processor Port Summary === |
| <code> | <code> | ||
