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
<andlabs>
ok, cool
<andlabs>
thanks
<Lord_Nightmare>
Foone: did you end up replacing the CMOS battery in the PS2?
<Lord_Nightmare>
also that power plant simulator kicks ass
<Lord_Nightmare>
the bolted floppy drives are probably a backup copy of the boot disks
<Lord_Nightmare>
floppy DISKS
<andlabs>
bolt the floppy drive
<andlabs>
don't let the drive out of your computer
<Lord_Nightmare>
need to get the tin snips and a dead 3.5 disk
<andlabs>
am I missing something in that photo
<andlabs>
it appears to be an empty package
<andlabs>
that is, you're just buying the box, no toy
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<cr1901_modern>
ej5: Congrats... your hard work paid off :D
<ej5>
thanks!
<Lord_Nightmare>
er, ej5
<Lord_Nightmare>
did you replace the CMOS battery on the PS/2?
<Lord_Nightmare>
i figured you'd already checked that with regard to the 162 error
<ej5>
it's got 6V across the terminals
<ej5>
and it's a battery i installed about 2 years ago, it should still be ok
<Lord_Nightmare>
weird. i guess check the filter caps, especially on various cards
<Lord_Nightmare>
anything which could cause voltage dips which would mess up the cmos sram contents
<Lord_Nightmare>
everyone calls it "CMOS" but its really "that battery-backed serially-accessed CMOS SRAM/RTC chip"
<ej5>
i will dig into it more eventually but i think it goes away when i remove the esdi hard drive
<Lord_Nightmare>
hmm. could be the spindle motor is drawing so much current its screwing stuff up?
<Lord_Nightmare>
check for bad caps, i know bad caps are the achilles heel of PS/2 floppy drives at least
<Lord_Nightmare>
i have like 5 drives i need to recap
<Lord_Nightmare>
surfacemount caps are all leaking
<ej5>
yeah i already recapped it
<ej5>
it didn't work at all before that, lol
<Lord_Nightmare>
also check for tantalum caps on the voltage rails on cards
<Lord_Nightmare>
i know plgdavid has an original adlib isa card and one of the filter tants let go
<ej5>
the 162 error is interesting because after i hit F1, the system boots normally
<ej5>
and configures all the cards correctly
<Lord_Nightmare>
i don't think they were properly specced for the voltage rails to begin with
<Lord_Nightmare>
odd
<Lord_Nightmare>
could be the sram chip on the mb itself is going
<ej5>
normally when the battery goes dead you have to run the setup disk to fix it all just to be able to boot
<ej5>
yeah lots of machines and cards used 16V tants on the 12V rails. fine for 20 years but not after that!
<ej5>
when i replace them i use 25V tants
<Lord_Nightmare>
i have one PS/2 model 60(?) a 386, where the sram fails to keep any contents even with a good battery
<Lord_Nightmare>
i suspect the sram chip itself is either fried, or theres a bad cap on the mb
<ej5>
that's interesting
<ej5>
or a leaky cap
<TD-Linux>
I try to use polymer caps on my new designs. I wonder how long they will last and how they will fail
<ej5>
those things are pretty robust, they are mechanically more stable
<ej5>
and you also don't need to derate them at all
<ej5>
a 6.3V poly is fine at 5V or even at 6.3V!
<TD-Linux>
they also have amazing esr ratings
<TD-Linux>
too bad you generally can't get them at high voltages (>100V)
<ej5>
and best of all, they taste much better than the old tantalums
<ej5>
heh heh
<TD-Linux>
my crt driver board arrives in a couple days
<TD-Linux>
I used high voltage mlcc caps in a couple places where traditionally film caps are used. we'll see how it goes
<ej5>
sounds expensive
<TD-Linux>
bom cost is $400 D:
<TD-Linux>
though that's not really the caps so much as the silicon
<whitequark>
ouch
<TD-Linux>
I should be able to cut it a lot in a future rev, but on this one everything is overkill because this is all new to me
<ej5>
wow.
<cr1901_modern>
eep
<ej5>
i like the $16.45 buck converter
<TD-Linux>
yeah that one also
<ej5>
LTC7149 better be gold plated
<whitequark>
linear: an entire lineup of perfect chips too expensive to use in any real design
<whitequark>
i don't know how they survive(d)
<TD-Linux>
it really isn't that good tbh. it does match my requirements exactly which is why it's on there but :(
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<ej5>
they had a lot of sockets in industrial gear
<ej5>
and apple gear, at least in the 90s
<TD-Linux>
it'll be the first to go on my second rev, but I've been sitting on this for 2 months already and wanted to finally get something working ish
<TD-Linux>
next out of control part is a SiC diode. $20/ea. it actually does have absurd specs. I'm pretty sure I'll be able to use the body diode of the SiC MOSFET but left a pad for one
<ej5>
what part #
<TD-Linux>
C3D10170H
<TD-Linux>
also realized I had some other stuff in this order so not actually $400. more like $300. still
<ej5>
for how many copies of the board?
<TD-Linux>
1.5
<cr1901_modern>
Yikes
<cr1901_modern>
Someone in ##openfpga did a PCB that was, like, $500 for 3 copies
<cr1901_modern>
I thought that was bad
<ej5>
dang, now THAT is a diode. how much current are you pushing through it anyway???
<TD-Linux>
somewhere between 2-4A (though at a very low duty cycle)
<TD-Linux>
also now that I'm searching I'm realizing there is a newer version of it that's cheaper whoops
<ValleyBell>
Oh, I completely forgot that he made a JSON API.
<KitsuWhooa>
maybe one day he'll fix the "http:/" in the urls :p
<cr1901_modern>
tyvm KitsuWhooa
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<cr1901_modern>
Unfortunately, packs.json, the endpoint I actually need, doesn't return data
<cr1901_modern>
but that might be okay... will test later
<andlabs>
is project2612 still alive
<ValleyBell>
It is... sort of.
<ValleyBell>
Monkeymook pops in once a year, says that she will do some updates, and then vanishes again.
<ValleyBell>
oh, actually, she updated a few packs in 2018
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<andlabs>
yeah but that's about it heh
<andlabs>
half the Sega Game Toshokan games are still missing packs, the Time Trax pack still has that weird looping bug that I can't quite pin down if it's a bug in their pack or in mine
<andlabs>
and other stuff
<andlabs>
heh
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