What will this 'fake'? AY-3-8910 reveal with acetone?
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- čas přidán 2. 08. 2024
- [ Update!
So it turns out these remarked chips are actually YM2149 sound chips.
The YM2149 is pincompatible, and sounds very similar, but has some minor differences that will still make it sound a bit different.
Some seem to prefer the YM2149 chip for the wider range of features.
Others just want the exact same sound as on the ZX Spectrum 128K models with AY-3-8912 soundchip.]
So after the previous video where I compare a 'cloned' (not sure what it is) AY-3-8910 chip, I did wonder if I could reveal what it actually is, just as plgDavid does in this video: • "Fake" chips?
I'm still not completely sure, it may be a YM2149F chip, according to the feedback to yesterdays video that I got from several people. - Věda a technologie
I would guess these are YM versions. Much cheaper ones that were very common in Soviet clones as well. It's pin compatible and in one way it's better that AY - the envelope table is 5 bit vs 4, but the volume table is more logarithmic and attenuates much quicker than original AY. So songs that were written for AY would sound more staccato whereas songs written for YM would sounds as if you would press sustain pedal on piano. Also, because of the modified volume table you get different envelope wave form and thus different spectral composition on modern AY/YM tracks that use envelope to make triangle or sawtooth-like sounds.
Exactly, I found that out by using a tool on a ZX Spectrum that someone write a while ago.
I just updated the description of this video.
I actually have continued designing the new ZX-AY versions (external ZX Spectrum sound cards) so people know what they are getting, but the price is accordingly: the 40 pin remarked YM2149 chips are very cheap compared to original AY-3-8912 or AY-3-8910 ones.
@@ByteDelight Yep. And as I said, there are good things about YM. Yamaha knew a bit more about sound than GI. They made volume table more logarithmically correct to have better distribution of 4-bit volume control, but.... you do end up with slightly different sound. There are various software emulators like Ay_emul and such that emulate the difference quite well. Unlike C64 SID chip that had some analogue circuitry, this one is fully digital and won't go bad like SIDs do.
The facts that 1 YM2419F is used for OPN operator envelope
The camera focuses by sharp edges, and the yellow lines on the mat are far more compelling than the chip up front.
Turn the mat over then :P
These rebadged chips are never really fakes, they are just made to look like newer releases. The cloned chips are not sanded/rebadged.
I received 30 "AY-3-8910" apparently from the exact same line as your remarked ones.
The legs look bright. Look like freshly tined
you should really use a better camera for this angle :)
just saying
Is there no test circuit for the basic functions of the 8913 chips? Maybe they just don't work in the specific environment of the sound interface?
There is no hint on something like that in the original datasheets.
The datasheets only show the functional differences (I/O pins and more) between the 3 chips (-8910, -8912 and -8913).
There is nothing about differences in operation or sound.
Those are rebranded SID chips............ 😁
It's a bit noughty, repaint old chips to look new. I still preffer the sound of the 12, though.
Maybe they had an "engineering sample" mark that was covered up/obliterated by blacktopping?
No, I have dozens.
They turned out to be blacktopped and remarked YM2149's - I have a software tool to check the chips.
Most probably they remarked them because there is more demand for AY-3-8910 chips with which the YM2149's are pin-compatible.
The sound is slightly different though.
So they can be used (they're cheap), but I can't sell them as legit original AY-3-8910 chips.
I will sell these as an alternative version to the ZX-AY, most probably call it the ZX-AY YM.
There can be no AY chip in this world which would have the GI logo and a 2006 date code. GI (the IC manufacturing subdivision of it) became Microchip in 1987. They totally sanded off whatever was printed on it originally, and laser etched the GI logo etc. It must be a cheap clone.
This is probably
Please buy some pure Acetone.
Much too long for the results!!! 😞
Sorry!
I can't waste my time watching non important information.