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Author Topic: YM3812, from Yamaha  (Read 780 times)
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Found that old opl2 chip, YM3812, from Yamaha, basically part of an old 8bit sound blaster card.

Now I'm wondering should I leave the chip on board  or should i try to hook it directly on a Mega256?

I found the PDF with the pin out:

http://pdf1.alldatasheet.com/datasheet-pdf/view/84281/YAMAHA/YM3812.html

Sound reasonably doable eider way but I would like a second opinion on this before starting the party.

Basically the card is MCA format, the Before ISA bus. And this bus is also well documented. I found some library for the chip, probably will need to be adjusted for the Arduino world.

But yeap What would you do leave it on board or stick it to a bread board?
« Last Edit: September 18, 2013, 09:26:32 am by Frédéric_Plante » Logged

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So I've decide to hook the thing on the bread board. for one simple reason. There is so much to know about the whole sound card and the MCA standard, that there is a good probability that the required library to make the sound card run will not fit in the 256k available.

So I've made a neeter version of the PDF i listed above into 6 JPG that contain the important information.

So let's get started.

Cause of the 4 pictures limitation the last 2 pictures will be send in the next post


* YM3812.0.jpg (67.37 KB, 768x871 - viewed 22 times.)

* YM3812.1.jpg (84.99 KB, 768x871 - viewed 37 times.)

* YM3812.2.jpg (116.34 KB, 768x871 - viewed 21 times.)

* YM3812.3.jpg (81.79 KB, 768x871 - viewed 26 times.)
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Has promessed.

As you can see in picture #5 the project might be possible since the thing is meant to work under 5 volt. Aint life great?

But a question come up, what should I use to générate the clock signal? At first I was going to use some 555, but I believe that the 555 is not reliable over  1 mgh. Humm what would you do?


* YM3812.4.jpg (39.71 KB, 768x871 - viewed 23 times.)

* YM3812.5.jpg (125.46 KB, 768x871 - viewed 26 times.)
« Last Edit: September 18, 2013, 11:42:52 am by Frédéric_Plante » Logged

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Oh! By the way, I will be using the Y3014B that fortunately was also on socket on the sound card. I can't find the PDF yet, but i will make some circuit picture up in the worst case scenario that the pdf does not exist.

It's a 8 pin dip chip so it should not require much work to figure out what is what since it's hooked straight to the YM3812.

Ok so that it for me for the rest of the after noon, working at 14:00 work some more tonight on this.

See ya.
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