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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<andlabs> does anyone here have a DX100
<andlabs> never mind I figured out what I was doing wrong
<cr1901_modern> https://twitter.com/0ldStaph/status/1282006699004420096 Bubble Memory ISA card
<cr1901_modern> because of course
<fseidel> It better play "morning music" while booting or it just isn't worth the effort :-P
<cr1901_modern> Morning music on OPL when?
<m4t> i impulse bought some bubble memory card a while ago https://photos.app.goo.gl/2ErDALbcxzgtpUfC9 top left
<m4t> the modules are underneath the metal plate
* m4t searched for ones without bad blocks listed on the labels
<cr1901_modern> What type of card is that?
<cr1901_modern> I see a card edge, but it doesn't protrude
<m4t> from some old fanuc industrial controller stuff
<m4t> https://photos.app.goo.gl/4uyFJXLGajo3nFDr9 sorry i don't have a better pic handy
<m4t> https://www.ebay.com/c/741209972 similar one with a single module
<cr1901_modern> Bubble memory controllers are batshit... check the logs for discussion
<m4t> just curious, what was the context?
<cr1901_modern> Emulating Gradius
<m4t> ah
<cr1901_modern> yes
<cr1901_modern> We don't actually know how the bubble memory controller IC works... the memory was read out by probing a working PCB and hoping for the best
<m4t> its really weird and obscure for sure
<m4t> not much surviving info on it from what i can tell
<cr1901_modern> Like DRAM, if you don't constantly rewrite bubble memory, its contents are destroyed
<m4t> the bubbles pop :P
<cr1901_modern> but you have to write it in the order it comes out
<cr1901_modern> it's like a treadmill
<m4t> i can visualize that
<cr1901_modern> I can just imagine some poor bastards in the 70s trying to write the firmware for a bubble memory controller and throwing their modules out a 5 story window in anger
<Foone> although they only need to be refreshed while being read out. a powered off bubble memory device does keep its contents
<cr1901_modern> right, bubble memory is non-volatile storage (oops!)
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