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Found 2 results

  1. If you're wanting to build a 2-stick Robotron controller or a large-scale 3D Printed single-player console, you may want to check this out: For even more detailed information, please see this video for how to print/wire everything up: All the latest information can also be found at : http://wagnerstechtalk.com/opencade
  2. I've recently become fascinated, again, with early software synthesis. For example, take Eugene Jarvis' sound engine in Robotron and Defender: I love that it ran on such a limited processor. But the thing that really gets me as a synth geek is the parameter space-- the fact that you can do so much with what I think he said was 8 parameters (in the Robotron GDC post-mortem). I see that he goes into a little more detail here: http://www.firepowerpinball.com/downloads/Eugene_Jarvis_Interview.pdf-- it's funny too because we always think of general-purpose-CPU softsynths as a late 90s phenomenon! Now, I see someone has done a commented Robotron disassembly, but I don't think they got to the sound system. I'd love to find more info about it, short of disassembling it myself. I also noticed that Konami's Time Pilot '84 produces a lot of similar tones. It supposedly uses one of those simple squarewave+noise PSGs, but it's driven by a reasonably fast CPU, which makes me wonder what's really going on there. Maybe it's manipulating the sound chip's registers really fast, or there's a bit-bang channel in addition to the sound chip. I think some of those dedicated PSGs had simple amplitude envelopes you could leverage, too..? Any other arcade games that use or are suspected of using a softsynth to generate their sounds besides these and the Namco games? Any tones that strike you as particularly neat? I might play with some primitive softsynth concepts tonight. I want to see if I can make one that barely branches, and also see what FM does with such low resolution grainy tables (for example, do you really need a LFSR if you've got FM feedback?).
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