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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<Foone> https://www.ebay.com/itm/Lot-30-Vintage-Computer-ECM-ECU-PROM-Chip-E5/224098902832 this might be fun for playing with the eprom reading
<Foone> wow they have like 5 lots of these
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<cr1901_modern> I mean, that's probably worth it for the cases and ESD foam alone
<cr1901_modern> Unfortunately it's not "Buy It Now" and my sniping days are long past...
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<TD-Linux> whitequark, I have summed the final boss of hell https://pdf1.alldatasheet.com/datasheet-pdf/view/125749/NSC/MM1702A.html
<whitequark> TD-Linux: wait, why hell?
<TD-Linux> look how it's programmed
<TD-Linux> (arguably simple on the software side)
<TD-Linux> 1) programming voltage must be pulsed for each byte
<TD-Linux> 2) programming voltage is -48V
<TD-Linux> 3) data pins and address pins must also use -48V (high) to 0V (low) logic levels
<TD-Linux> also in normal operation it needs a -9V power supply and has a low output level of -0.7V
<TD-Linux> (don't actually support this chip, it's not in many interesting things)
<whitequark> lol
<whitequark> wait
<whitequark> did a telecom engineer make this
<TD-Linux> also it consumes far too much power for the programmer to run off of usb
<TD-Linux> 200mA on the -48V rail
<whitequark> under no circumstances am i going to make an adapter that generates -48V
<whitequark> also isn't that ten watts?!
<whitequark> ... over 30 seconds???
<whitequark> did it get red hot
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<TD-Linux> there's a delay between programming pulses. arguably you could use a supercap or something to solve the problem
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<TD-Linux> I personally get really excited at the prospect of having a high voltage, high power supply, but that's probably just me
<whitequark> oh
<whitequark> TD-Linux: for some reason i really dislike making SMPSes
<TD-Linux> it's super busywork
<TD-Linux> especially for low voltage board rails
<TD-Linux> it's only fun (but also frustrating) when you try to do something sufficiently out of the box
<whitequark> mhm
<TD-Linux> one of my projects has a 200V main rail and up to 1700V on the board. and also jtag
* whitequark slowly backs away
<TD-Linux> (tbh it's on hold because I got tired of working on it... maybe this doesn't back up my argument so well)
<whitequark> i found a place with jtag where i *wouldn't* stick my probe in
<ZrX-oMs> http://oms.wmhost.com/jumitus.png - Disk might have some issues
<TD-Linux> mmmm drag
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<ZrX-oMs> 8" were the era where everything goes.
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<cr1901_modern> https://twitter.com/cr1901/status/1276629331989729292 All home computers should come with cats
<andlabs> that reminds me to again re-ask my question about a retro PC compatible that can run win3.1
<andlabs> I saw some videos on the EX and HX and it looks like they're a massive hassle to configure and upgrade
<andlabs> also Pietro Gagliardi, [26.07.20 14:13] still surprised by how much attention my virtualized installation of the visual c++ 3 and win3.1 sdk from msdn got on mastodon a few years ago
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<TD-Linux> so far undervolted programming actually worked better than UV lamp
<TD-Linux> there is only a small range with UV lamp where it's partially erased and I missed it this time around
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<emeb> cr1901_modern: here's the source for that old FM FPGA experiment I mentioned -> https://github.com/emeb/f303_ice5_fm
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<cr1901_modern> emeb: Good stuff :)
<emeb> cr1901_modern: I needs a lot of work to be useful, but it's got potential.
<emeb> s/I/It/
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