ChanServ 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://freenode.irclog.whitequark.org/~h~yamahasynths
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<cr1901_modern>
ej5: There was a physical prototype of the Sound Blaster called the "Killer Card", correct? If I got the name wrong, do you remember its name?
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<ej5>
cr1901_modern, yes that's what it was.
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<nukeykt>
Good news, apparently instrument rom in ym2413b is mask ROM and it's possible to distinguish bits. I've crosschecked it with my tuned patches and it only had differences that don't affect audio at all. As side note this confirms that fhb013 IS ym2413b
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<cr1901_modern>
nukeykt: What's the difference between ym2413b and ym2413 (I've been out of it)
<cr1901_modern>
fhb013 is VRC7 IIRC
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<superctr>
VRC7 is DS1001
<superctr>
i think but not sure that YM2413B (FHB013) is CMOS while the original was NMOS
<l_oliveira>
FHB013 is the SOP version of YM2413?
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<nukeykt>
ym2413b is a low power cmos version of ym2413
<l_oliveira>
yeah but I was wondering if that is the SMD one