cr1901 changed the topic of ##yamahasynths to: Channel dedicated to questions and discussion of Yamaha FM Synthesizer internals and corresponding REing. Discussion of synthesis methods similar to the Yamaha line of chips, Sound Blasters + clones, PCM chips like RF5C68, and CD theory of operation are also on-topic. Channel logs: https://libera.irclog.whitequark.org/~h~yamahasynths
<andlabs>
also late but I finally contacted buyee btw
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<NiGHTS>
RetroWave OPL3 Sound Card from SudoMaker on Tindie
<cr1901>
>Each chip is tested using the Sine Wave method and wiped with acetone on surface
<cr1901>
Sine Wave method?
<cr1901>
That's a good test for "making sure you're programming the chip correctly", but is it good for "making sure your chip isn't counterfeit"?
<cr1901>
(General q for the room)
<andlabs>
I would hope your FM synthesizer wasn't based on other wave types
<andlabs>
unless it supports those
<andlabs>
(TX-81Z)
<cr1901>
I meant "is programming a sine wave output sufficient to prove your chip isn't defective, rather than a more complex waveform"?
<andlabs>
oh that's what that means ok
<andlabs>
and the answer is no
<andlabs>
but at the same time I have yet to hear of a Yamaha chip that has a defect in a different part of the chip where some random parameter fails but not he rest of it
<andlabs>
so maybe there is some sufficiency to that
* cr1901
nods
<andlabs>
the problem with thoroughly testing a chip like even the simplest OPL chip is that there are too many variables to test
<andlabs>
and then you have people like LGR who apparently have hyper-memorized the way specific games sounded and can notice things that you'd think wouldn't be edge cases
<Jenetrix>
well, it worked with my very weird edge-case perfectly
<cr1901>
Awesome :D
<andlabs>
I say that because quite frankly I'm not fully buying those things *as* edge cases
<andlabs>
like I'm still not entirely convinced western-made OPL PC games used anything beyond the 10 most basic FM voices
<tunixman>
"edge cases" are just cases.
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