So this just happened \ VOGONS

So this just happened

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First post, by Stojke

Posted on 2014-03-07, 18:40

Stojke Offline

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Reading Vogons about CT2860, read its noisy and not so good.
Say to my self, ok, this will be the donor for capacitors and audio jacks for another card.

Remove capacitors i need and audio jacks and damage the board a bit near the out.
Checking the card for what else to remove.

Notice it has YM262...

I think ill be sad for a week i didnt try it out before this 😁

Also, found this in my basement: http://www.amoretro.de/2011/06/unbekannte-opl … oard-chips.html

Note | LLSID | "Big boobs are important!"

Reply 1 of 4, by JayCeeBee64

Posted on 2014-03-07, 21:55

JayCeeBee64 Offline

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(Deleted. No longer relevant anyway)

Last edited by JayCeeBee64 on 2019-07-10, 16:02. Edited 1 time in total.

Ooohh, the pain......

Reply 2 of 4, by gerwin

Posted on 2014-03-08, 19:09

gerwin Offline

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I also did surgery on that same model CT2860. It has two amplifiers in series. One fixed volume, and one adjustable volume. Double the noise. I bypassed the adjustable amplifier, tested it, was not entirely satisfied, then put it in storage.
It was HP (Hewlett Packard) who doomed the CT2860 when they designed it.

--> ISA Soundcard Overview // Doom MBF 2.04 // SetMul

Reply 3 of 4, by Jepael

Posted on 2014-03-10, 07:50

Jepael Offline

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So now you have a real OPL3 card with lousy parts removed. Improve it with better parts.

I did the same for some Aztech card with YMF262 which had incorrectly designed or manufactured OPL3 analog output path. It had too large DAC deglitching capacitor so high frequency signals on one channel was sent to both channels. Spent a while debugging my software code before realizing my code is not wrong, the hardware is.

Reply 4 of 4, by Stojke

Posted on 2014-03-11, 11:23

Stojke Offline

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Posts: 2080
Joined: 2012-03-23, 14:51
Location: Serbia

So it is quite bad, well that makes it easier on me 🤣
Plus i got really interested into Crystal CS4236 OPL3.

Note | LLSID | "Big boobs are important!"

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