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: How much is the BOM approx for the sound bluster? What if I include headers for all the parts (though I have a set of headers I got for Christmas)?
<cr1901_modern>
safe to ignore the CMS chips for now, I don't plan on populating them
<ej5>
i don't know, it depends a lot on where you buy the parts
<cr1901_modern>
guess I will shop around then. I'm sure to have time.
<cr1901_modern>
Also semi related... Idk when it's gonna be safe to solder really for a while now :/.
<cr1901_modern>
So, I may just put the boards aside for a few months (but thank you for your work all the same- it was a wonderful thing you did)
<ej5>
np
<cr1901_modern>
At the very least, I'll look into the relevant 8051 support if open-tl866 doesn't support that exact chip yet (cc: cnomad)
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<Foone_>
I did a quick estimate a little while ago and figured about 50-75$ for the full BOM including the opl2s
<cr1901_modern>
Awesome... thank you for the numbers
<cr1901_modern>
still a bargain lmao
<Foone_>
for an original 1.0 soundblaster, yeah. if you just need a compatible for an old computer, no. you can get a vibra 16 for like 20$ shipped, as they made about 2 billion of them and plenty are still hanging around
<cr1901_modern>
I meant an 8-bit card specifically
<Foone_>
yah. although I think most (all?) of the 16-bit ISA soundblasters can be used in an 8-bit system if you have room (or take a hacksaw to them), they just use the 16bit part for extra IRQs
<cr1901_modern>
... that's horrifying
<Foone_>
that was surprisingly common back in the day, from what I've seen
<Foone_>
like there's a bunch of video cards that do wire up the non-IRQ pins but will happily drop back to 8-bit mode if you don't hook them up
<Foone_>
so you can stick a full 16-bit VGA card in an original 5150, you just only get 8-bit access
<cr1901_modern>
Yes, and I've historically not been so lucky w/ this
<cr1901_modern>
I also have a Kingston ISA Ethernet card that's _supposed_ to work in an 8-bit slot, but in recent years it decided to just give up
<cr1901_modern>
Was REing the packet driver to see what was wrong but that went by the wayside for now
<whitequark>
Foone_: how do you distinguish 8-bit and 16-bit transactions?
* cr1901_modern
wants to say "there's a pin for that", but doesn't actually remember
<cr1901_modern>
Oh right, I should throw the packet driver until ghidra or binja and see what I/O ports it pokes. The only reason I wanted to do that is b/c there's f*** all information about the chip itself
<whitequark>
oh, SBHE pin
<whitequark>
and MEMCS16 and IOCS16
<cr1901_modern>
Remind me what SBHE pin does... Sound Blaster Hi-Enable :P?
<Foone_>
I'm not actually sure, but that seems to make sense
<Foone_>
it might just be that the card's firmware tries to do a 16bit read and sees if it completely fails and if so, falls back to 8bit
<Foone_>
the ISA cards I've tried either automatically detect being run in 8-bit mode or don't work at all, I don't recall any that made me set jumpers
<Foone_>
actually, no, that's not right: there is one VGA card I have which has a "8bit mode" jumper, but if you run it in 8bit mode without setting the jumper, it still autodetects 8bit mode
<Foone_>
so it's just there so you can make it run in 8bit mode in a 16bit system because reasons.
<cr1901_modern>
It's possible that jumper is for the IBM XT (sic's) miswired 7th slot
<cr1901_modern>
For some reason the last ISA slot on the IBM XT has a direct connection to the CPU rather than being buffered (or something like that), and this tends to break ISA cards without a jumper for that behavior
<cr1901_modern>
Nobody knows anymore why IBM did that lol