this is a simple schematic for a gameport->midi-out adapter:

you connect it to the CM-64's IN port and it will work fine... straight cable connections are not a good idea.

Ok thanks, if i get a 74LS00 i'll do that thing.
But, should i have gotten sound or not? What will/would happen with a straight connection?

What about those midi/gameport-cables you can get on amazon/ebay? Do the have this circuit?

Quite a few ways it can go wrong when directly connected. Part of the reason for the physical connection spec is that it's much more predictable.

With direct connection there may not be enough current to drive the LED in the optoisolator on the receiving end, depending on what sort of resistor is used in series with the MIDI line.

keropi wrote:

this is a simple schematic for a gameport->midi-out adapter: […]
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this is a simple schematic for a gameport->midi-out adapter:

you connect it to the CM-64's IN port and it will work fine... straight cable connections are not a good idea.

Ok got a 74LS00. Ist pin 15 not connected? or ist there a line missing in that graphic`? And 8 and 9 are not connected?

This is for MIDI Out only. Other pins are needed for MIDI In.

yes the schematic is edited to only include the MIDI out port , the IN port requires some more components and it is not needed for gaming/playback

By convention NAND gate pins 1, 2, 4, and 5 should be strapped to ground (or +5V) and not allowed to float.

One more question (for now), why midi out? I thought that would go to some other midi device...

MIDI Out from the sound card goes into MIDI In on the CM-64. That's how MIDI devices are connected.

Yes exactly, but in that pic/schematic the din-connector is "midi out".

edit: i know, i'm counting beans here. I know that the midi signals are going out on that side. But if you have a connector on a device that is called "midi out" i would use another description 😁

Oh i forgot, many thanks it works!