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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<Lord_Nightmare>
ej5: i was working on a REAL fake datasheet at one point
<Lord_Nightmare>
the existing scan of the english application manual for the YM2151 is horrible
<Lord_Nightmare>
its missing the titlepage and scanned at such a low res that much of it isn't really readable
<Lord_Nightmare>
I was checking the feasability of re-laying it out in scribus, including a fake titlepage using the same fonts that other contemporary application manuals used
<Lord_Nightmare>
it would take a few hours per page, so i sort of gave up
<Lord_Nightmare>
everything else iirc comes from various yamaha vectors they published on their website, and finding that damn font (eurostyle extended black, iirc)
<ej5>
oof that's too much work
<Lord_Nightmare>
and helvetica for the FM OPERATOR TYPE-M thing
<cr1901_modern>
How were those manuals laid out? TeX was a thing back in the 80's right?
<Lord_Nightmare>
i'm 99% sure they were done on a phototypesetter, since the kerning of the modern eurostyle otf font isn't even CLOSE to the one that the YM2413 app manual used
<Lord_Nightmare>
and used lots of hand tweaks
<Lord_Nightmare>
the 'Times' font used on the inner pages has kerning that MOSTLY matches the times new roman/times digital fonts but it isn't 100% the same
<Lord_Nightmare>
is what re-laying out the inside would be like
<Lord_Nightmare>
iirc there's a typo on my re-layout there, spot it
<cr1901_modern>
effetcs
<Lord_Nightmare>
yep. there might be another one, i forget.
<Lord_Nightmare>
I've seen many datasheets/manuals 're-laid-out' by feeding them through OCR and they look awful with mixed up fonts etc
<Lord_Nightmare>
if you're gonna do it, you should do it RIGHT. though if it takes 3 hours per page for like 25 pages, maybe not.
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<cr1901_modern>
Lord_Nightmare: I'm extremely partial to the typesetting used in Nintendo's mid-90s manuals
<cr1901_modern>
i.e. the 1995 version of the SNES manual and the VB manual
<balrog>
Lord_Nightmare: this probably could be automated in a way that works reasonably well
<andlabs>
[16:04:00] <cr1901_modern>ej5: You've probably done this before and I forget, but how long before you do a fake datasheet in the same vein as Signetics 25120?
<cr1901_modern>
It was a random convo from me looking at ej5's hellsite feed
<andlabs>
hm
<andlabs>
[21:01:11] <Lord_Nightmare>everything else iirc comes from various yamaha vectors they published on their website, and finding that damn font (eurostyle extended black, iirc)
<andlabs>
ah eurostile extended
<andlabs>
now you too can make every sci-fi movie ever
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<andlabs>
about yamaha synths that use that microcontroller?
<andlabs>
right
<andlabs>
I mean
<andlabs>
you could probably write your own ROM or reuse the chips in your own 6-op game adapter with this information
<andlabs>
even though they were never sold commercially
<andlabs>
I'm going to guess this is not the amount of detail that Yamaha wanted to give away...
<superctr>
they give away the info necessary to troubleshoot a TX7 without yamaha having to send a technician from japan or whatever
<superctr>
by giving some description of the chips and the pinout you could figure out where an "audio" issue could originate, for example
<andlabs>
right, I'm just saying this is probably more information than necessary =P
<andlabs>
and if their later service manuals are anything to go by they probably agree
<superctr>
later on they would just have resources to do repairs themselves, and the chips got more integrated anyway, the service manuals became simpler
<superctr>
later yamaha service manuals still give pinouts of most custom chips along with a very brief description (usually the abbreviation of the codename)
<superctr>
They still don't describe the inner workings of the chips, like register maps or FM synthesis algorithms
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