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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<cr1901_modern>
ej5: So I kinda-sorta forgot I had this, but I have a spare IBM 5150 motherboard I've previously used for testing... I'll have to pull that out and set that up on a temporary table (my workbench is full) for SB DSP dev
<cr1901_modern>
IIRC I even wired a reset button mod to it
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<whitequark>
i understand why these 5150 and xt boards exist, but actually using them feels a bit like "what if we constructed an embedded system, in 2019, out of components designed with maximum amount of suck"
* cr1901_modern
smiles and says "no comment" :)
<cr1901_modern>
Fun fact I learned recently- IBM PC was in fact the slowest of the "8-bits (ignoring pedantry for a moment)" in 1981- prefetch queue couldn't save it.
<Lord_Nightmare>
jeez. cr1901_modern did you replace the power connector on the board?
<cr1901_modern>
Nope :)
<cr1901_modern>
It never caught fire or otherwise, so I run it as-is
<Lord_Nightmare>
afaik its a standard molex(?) connector, or berg
<Lord_Nightmare>
i forget
<cr1901_modern>
berg is the floppy connector
<cr1901_modern>
3.5"*
<Lord_Nightmare>
what does that pin do? is it a ground connector?
<cr1901_modern>
It's a 5V pin
<Lord_Nightmare>
the one which broke off
<Lord_Nightmare>
ah and theres two 5v pins?
<cr1901_modern>
three
<Lord_Nightmare>
ok
<Lord_Nightmare>
then its probably fine
<cr1901_modern>
well now there's only 2
<cr1901_modern>
b/c I broke one
<Lord_Nightmare>
you should still get a new connector and swap it at some point
<cr1901_modern>
That'll have to wait another 5 months for reasons. But also, I would realistically make the problem worse by trying to desolder a power connector
<cr1901_modern>
Where does one buy P8 and P9 connectors today
<whitequark>
that's just a molex innit?
<cr1901_modern>
Yes, according to the wiki page
<whitequark>
digikey then lol
<Lord_Nightmare>
cr1901_modern: if you don't have the tools to desolder it don't bother
<Lord_Nightmare>
it likely won't cause many issues as is
<Lord_Nightmare>
when/if you get or borrow a desoldering station is when you should deal with it
<cr1901_modern>
"black wires together". "red and red and you're dead"
<Lord_Nightmare>
its not an immediate concern unless the 5v lines start to get hot
<cr1901_modern>
since they're not keyed
<Lord_Nightmare>
if the board sees constant use every day, i'd get it fixed
<Lord_Nightmare>
if its used occasionally, it can wait
<cr1901_modern>
Very occasionally
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<cr1901_modern>
Most of the time it sits on a shelf
<cr1901_modern>
But if I'm doing ISA stuff, it's pretty valuable since I can just put it onto a table and add/remove cards at will (occassionally while the system is on)
<cr1901_modern>
Lord_Nightmare: I've never done temperature measurements, tbh. But would be an interesting experiment w/ an IR thermometer to run the power supply near full load (floppy, ISA, and maybe half height hard dri- oh wait, all mine are dead)
<whitequark>
or use an adjustable load?
<cr1901_modern>
I would need multiple loads (for 12v, -12v, -5v, and 5v), but yes that would work.
<cr1901_modern>
I could attach to only 2 of the 3 pins of the 5v rail and see if the supply complains
<whitequark>
pretty sure they're shorted on the supply side
<cr1901_modern>
Ahhh well, there's _probably_ no problem then. Guessing splitting the rail into 3 was likely a precaution. <-- Lord_Nightmare
<whitequark>
no it's because the wires can carry only so much current
<whitequark>
and contacts
<whitequark>
and they wanted to use some cheap connector
<cr1901_modern>
If I get a good desoldering station, I'll replace it. My experience up until now is that the board tolerates missing 1/3 of its 5v rail just fine. And that's w/ 3 ISA slots populated (floppy, video, and whatever I'm debugging)
<whitequark>
so the way this is specified is in terms of temperature rise under worst conditions
<whitequark>
i.e. say you have 60°C inside of the case, and the current per wire causes 40°C of temp rise, and the wires are spec'd at 120°C, then it's OK
<whitequark>
if the wires are spec'd at 90°C then that's a problem because they'll fall apart eventually
<whitequark>
anyway. if with your desired load the wires don't get warm to touch, it probably doesn't matter at all other than just being mechanically weaker
<cr1901_modern>
will check next time I power it on, but I don't recall anything like that
<whitequark>
it'll be like 20 years before first split phase design appear, if I recall correctly
<whitequark>
and they don't even use split phase on 5V
<whitequark>
sorry, multiphase*
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<cr1901_modern>
Right, it's an early (earlier) switching power supply using a dedicated PWM IC (as opposed to a microcontroller).
<whitequark>
i think microcontrollers didn't become common in ATX PSUs until 2010s
<whitequark>
i'm not even sure if they *are* common today
<cr1901_modern>
Sample point I was thinking in particular: Apple uses msp430s for their laptop supplies
<whitequark>
i think most multiphase switchers today (in PCs) are stuck near the load
<whitequark>
like Vcore for CPU and GPU
<whitequark>
you're not really aiming for absolute lowest ripple on 12V
<cr1901_modern>
Probably a subliminal advertiseme- ya know what, I'm just gonna be positive. I really like this.
<andlabs>
will have to chekc that
<andlabs>
I'm not sure if Ableton makes synths or just sequencers
<andlabs>
which reminds me, does Ableton have an accessibility-friendly UI yet
* cr1901_modern
shrugs
<andlabs>
and support VST plugins's native file formats instead of hijacking the Open and Save dialogs to only support Ableton's proprietary formats
<andlabs>
that was my experience with trying Ableton Live briefly a few years ago
<cr1901_modern>
I don't use Ableton... when I have time to use my MIDI keyboard I'm going to try it w/ Ardour (the only good FOSS DAW)
<cr1901_modern>
I don't remember where, but someone created a VST/LV2 using nukeykt's YM2612 core
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<cr1901_modern>
(No)
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<Lord_Nightmare>
i thought nuked-opn2's license was incompatible with the steinberg vst2 license
<Lord_Nightmare>
vst3 sdk i think is dual licensed as steinberg's non-commerical license and gplv3, with you being able to purchase a commercial license
<Lord_Nightmare>
but vst2 is not
<Lord_Nightmare>
so making a vst3 instrument with nukeykt 's core is allowed, but not vst2 unless you use an alternative SDK
<Lord_Nightmare>
JUCE is gpl so again you can't use steinberg's vst2 sdk
<Lord_Nightmare>
then again steinberg is no longer allowing vst2 sdk to be licensed out/distributed for 3 years
<cr1901_modern>
Yea I can't even find the vst2 sdk, tbh