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, CD/floppy disk theory of operation, and the 68k CPU are also on-topic. Channel logs: https://libera.irclog.whitequark.org/~h~yamahasynths
<theunixman>
quefrency, nice.
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<fseidel>
cr1901: the datasheet for the MC6804 is wild, it's apparently a cost-reduced 6805 (self-contained 6800-based MCU) that's internally bit-serial
<fseidel>
1-bit datapath!
<Lord_Nightmare>
i'm convinced the MC6804 must have the same or similar "non-user mode" as the later 6805 does
<Lord_Nightmare>
since there must be some way to dump the as-of-yet undumped "user ROM area" from 0x1b to 0x5f
<Lord_Nightmare>
which the vcp200 does use
<cr1901>
fseidel: Ahh, so like SERV in the modern times
<cr1901>
Lord_Nightmare: So in other words, the VCP200 firmware is not dumped?
<Lord_Nightmare>
abot 95% of it is dumped
<Lord_Nightmare>
just one small section isn't
<cr1901>
Is it enough that if I refreshed on my speech recognition stuff from 12 years ago, I could understand the program?
<cr1901>
> In any case, speech recognition in the 70s was interesting w/ the vocal tract models (even if I'm bad at it), so I was curious how they fit a speech recognizer in a tiny package
<cr1901>
crosspost from ##sillycon as for the reason I care
<Lord_Nightmare>
hold on
<theunixman>
it's funny, I worked on a flight cost prediction system that had a "wind model" stage, which basically was a multiplier for the east-west bias of the wind sometimes.
<theunixman>
the name sounded super amazing but it was mx + b where b = 0.
<theunixman>
I'm wondering if they hand-coded their own FIR filters in 6809...
<theunixman>
used the timings of instructions as part of the coefficients....
<cr1901>
how does insn timing let you infer coefficients?
<theunixman>
actually that's a great question... I don't think it does really, unless they depend on skipping samples in some cases, but that would just be weird.
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