NO OPERATION — signal-flow flowchart

NO OPERATION — signal-flow flowchart

Image rep algo 0 · slots 0,7,11,12,13,14,28,29,30,31,37,38,40,41,42,43,44,45,46,47,49,51,55,61,62,63,69,76,77,78,80,81,82,83,84,85,86,87,92,93,94,95 · unit 0 (I-RAM load 84) · family dynamics · confidence medium.

dry pass-through that still runs a level detector (2/pi env, one-pole smoothers); shared by 42 effect slots

49 words, 8 class-A coefficient multiplies (0 named), 0 instructions still opaque, 14 of 49 not yet decoded. Landmarks detected: 1 biquad DF-I section(s), 2 C-format immediate load(s), 3 DRAM read/write word(s).

flowchart TD
    N0["Stereo input (L / R)"]
    N1["C-format immediate loads (C40/C41)<br/>destination register UNKNOWN &mdash; the old 'envelope detector' reading is WITHDRAWN &times;2"]
    N0 --> N1
    N2["Output (RETURN to kernel epilogue)"]
    N1 --> N2

    classDef io fill:#e8eef7,stroke:#33475b,stroke-width:1px,color:#111;
    classDef proven fill:#d7f0d7,stroke:#2e7d32,stroke-width:2px,color:#111;
    classDef measured fill:#dbe9fb,stroke:#1565c0,stroke-width:1.5px,color:#111;
    classDef inferred fill:#fdf0d5,stroke:#b8860b,stroke-width:1.5px,color:#111;
    classDef open fill:#eeeeee,stroke:#888,stroke-width:1px,color:#333,stroke-dasharray:5 5;
    classDef ctrl fill:#f3e8fb,stroke:#6a1b9a,stroke-width:1px,color:#111;
    class N0,N2 io;
    class N1 open;

Classic-topology match

Most likely textbook topology: Envelope follower + gain computer (level detector → VCA).

A rectify/smooth level detector drives a gain multiply; no delay line.

Instruction hint: the threshold/envelope path GATES a class-A MAC (LIVE: COMPRESSOR’s SRC 0x07/ACT 0x15 store MAC does not fire every frame — the threshold conditional).

Per-instruction detail: ../disasm/prog00_no_operation.dsm. Confidence legend and method: README.md. Narrative: the MAME development blog, KN5000 effects-DSP series (Parts 78-84). Reference: the project docs site, /effects-dsp/.