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awesome work there with the pcbs 😀

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^ no doubt about that either 😀

What will connect to the card?

Stojke wrote:

What will connect to the card?

the Roland MPU-401 box , this specific version:

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Oh i understand now 😁
That breakout box design is so awesome

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Good. Now please clone the breakout box as well.

🤣

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archsan wrote:

Good. Now please clone the breakout box as well.

If it is enough to just make it compatible with PC, it only needs to look like a register compatible UART to a PC (register map is approximately compatible with a Motorola 6850 UART). Then make a compatible breakout box with modern microcontroller guts as you wish.

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Hey hey that 🤣 smiley means I was kidding!

I have the MPU-IPC-T version (got the pair for cheap years ago), you know, where the processing unit is on the ISA card instead. Hence some of the chips look very familiar to the innards of your MPU-401. In the case of your MPU-401 it actually houses the processing unit itself indeed, so it's more than just a "breakout box" -- whereas with the MPU-IPC-T the term is more correct. 😀

Apparently the MPU-401 box is as important as the MPU-IPC-T card, but the silly thing is that the MPU-IPC-T breakout boxes are far more available than the actual MIDI processing unit cards themselves. Silly silly scrapers!

Great job. Nice to see someone taking a project through to completion. Out of interest what's the total materials & assembly cost per card in your current small production run?

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Um, when you say this:

PeterLI wrote:

MPU-401s are pretty common and usually really cheap. 😀

How cheap do you mean exactly? Somewhere under $50? Actually I got my two pairs for less than that each. Well the cheap ones come and go really fast I suppose.

Btw, I too like the elegant design of the MPU-401 box. And also the cards you have made -- they look simply good somehow. 😀

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PeterLI wrote:

1 JPY

Oh, one yen... of course. Excuse me, I have to go and learn some Japanese. Then I'll grab myself some bargain ローランド stuff. 🤣

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