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Random Tune Generator for Amiga\n * Compiles with SAS/C or VBCC\n * Uses Amiga's Paula audio hardware via audio.device\n */\n\n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n#include \n\n#define WAVE_SIZE 256\n#define NUM_NOTES 16\n#define NUM_CHANNELS 4\n#define CLOCK_PAL 3546895L\n\n/* Note periods for Paula (PAL) - C-2 to B-4 */\nstatic UWORD notePeriods[] = {\n 856, 808, 762, 720, 678, 640, 604, 570, 538, 508, 480, 453, /* Octave 2 */\n 428, 404, 381, 360, 339, 320, 302, 285, 269, 254, 240, 226, /* Octave 3 */\n 214, 202, 190, 180, 170, 160, 151, 143, 135, 127, 120, 113 /* Octave 4 */\n};\n\n/* Pentatonic scale offsets for pleasant melodies */\nstatic UBYTE pentatonic[] = { 0, 2, 4, 7, 9, 12, 14, 16, 19, 21 };\n\n/* Audio channel allocation map */\nstatic UBYTE chanMap[] = { 1, 2, 4, 8 };\n\nstruct IOAudio *audioIO[NUM_CHANNELS];\nstruct MsgPort *audioPort[NUM_CHANNELS];\nBYTE *waveform = NULL;\n\n/* Build a simple sine/square hybrid waveform */\nvoid buildWaveform(void)\n{\n int i;\n waveform = AllocMem(WAVE_SIZE, MEMF_CHIP | MEMF_CLEAR);\n if (!waveform) return;\n \n for (i = 0; i < WAVE_SIZE; i++) {\n /* Sawtooth wave - simple and effective */\n waveform[i] = (BYTE)((i * 2) - 128);\n }\n}\n\n/* Open one audio channel */\nBOOL openAudioChannel(int ch)\n{\n audioPort[ch] = CreatePort(NULL, 0);\n if (!audioPort[ch]) return FALSE;\n \n audioIO[ch] = (struct IOAudio *)CreateExtIO(audioPort[ch], \n sizeof(struct IOAudio));\n if (!audioIO[ch]) return FALSE;\n \n audioIO[ch]->ioa_Request.io_Message.mn_ReplyPort = audioPort[ch];\n audioIO[ch]->ioa_Request.io_Command = ADCMD_ALLOCATE;\n audioIO[ch]->ioa_Request.io_Flags = ADIOF_NOWAIT;\n audioIO[ch]->ioa_AllocKey = 0;\n audioIO[ch]->ioa_Data = &chanMap[ch];\n audioIO[ch]->ioa_Length = 1;\n audioIO[ch]->ioa_Request.io_Message.mn_Node.ln_Pri = 60;\n \n if (OpenDevice(\"audio.device\", 0L, \n (struct IORequest *)audioIO[ch], 0L)) {\n return FALSE;\n }\n return TRUE;\n}\n\n/* Play a note on a specific channel */\nvoid playNote(int channel, int noteIndex, int volume, int duration)\n{\n if (noteIndex < 0 || noteIndex >= (sizeof(notePeriods)/sizeof(UWORD)))\n return;\n \n audioIO[channel]->ioa_Request.io_Command = CMD_WRITE;\n audioIO[channel]->ioa_Request.io_Flags = ADIOF_PERVOL;\n audioIO[channel]->ioa_Data = (UBYTE *)waveform;\n audioIO[channel]->ioa_Length = WAVE_SIZE;\n audioIO[channel]->ioa_Period = notePeriods[noteIndex];\n audioIO[channel]->ioa_Volume = volume;\n audioIO[channel]->ioa_Cycles = duration;\n \n BeginIO((struct IORequest *)audioIO[channel]);\n}\n\n/* Wait for a channel to finish */\nvoid waitChannel(int channel)\n{\n WaitIO((struct IORequest *)audioIO[channel]);\n}\n\n/* Close audio channel */\nvoid closeAudioChannel(int ch)\n{\n if (audioIO[ch]) {\n CloseDevice((struct IORequest *)audioIO[ch]);\n DeleteExtIO((struct IORequest *)audioIO[ch]);\n }\n if (audioPort[ch])","url","link_url","/p/512osp3lifdma_7y0hts","versioned_link_url","/p/512osp3lifdma_7y0hts/1","yapping","**Considering Web Adaptation**\n\nOkay, I'm currently pondering the feasibility of converting this Amiga C music generator into a web-based interactive experience. I'm focusing on adapting the sawtooth waveform generation and recreating the note period calculations, which are tied to the PAL Amiga's Paula hardware, using web audio APIs. I'm thinking I'll need to focus on a pentatonic scale emulation for simplicity.\n\n\n**Developing Web Audio Implementation**\n\nI'm now zeroing in on the web implementation plan. The audio engine will leverage the Web Audio API to reproduce the Amiga's four-channel sound. I'll recreate the \"Sawtooth\" (or \"Sine/Square hybrid\") waveform using `OscillatorNode` with the `sawtooth` type, or custom `AudioBuffer` for the \"authentic\" low-res sound. The sequencer will implement random music generation within a pentatonic scale. I'll need to map the Amiga's hardware clock-specific `notePeriods` to standard frequencies (Hz), and the interface will be a retro \"Workbench\" or \"Tracker\" style, including start/stop and channel indicators.\n\n\n**Designing the Amiga UI**\n\nI'm now focusing on the interface. I'm aiming for an authentic Workbench aesthetic, with a top bar, clock, and menu, plus Workbench-style colors. I envision windows with gadgets, a \"Generate\" button, visual channel indicators, and tempo/randomness controls. I plan to use `index.html`, `style.css`, and `app.js` to structure the project. I'm also refining the frequency calculation: I now understand it is `3,546,895 / (Period * 256)`.\n\n\n\n\namiga_os_31_cursor.png\n```amiga_os_31_cursor.png\n```\n\nindex.html\n```index.html\n```\n\nstyle.css\n```style.css\n```\n\napp.js\n```app.js\n```","page_description","The page features a graphical user interface for a program called \"RandMusic,\" which is an Amiga random tune generator. It displays interactive elements…","cursor","eyJpZCI6IjUxMm9zcDNsaWZkbWFfN3kwaHRzIn0","token","included",[],"routes/browser/layout","actionData","errors"]