When searching on the internet i have found some similiar controller, only with a little bit different layout.
But the looks where just the same.

Robin4 wrote on 2024-04-07, 15:30:

Board has markings like: 070-5-0490. But iam guessing 04 - 90 could mean like month 04 1990.

I don't think this is a date code, but some internal design number.

Robin4 wrote on 2024-04-07, 15:30:

Yellow sticker on the board says 9124.. -> 1991 , week 24?

This seems likely.

Robin4 wrote on 2024-04-07, 15:30:

What clear is that the jumper settings (on the bottom) are for IRQ settings. Al those settings have 3 pins per setting.

You will find that the labels IRQ15,12,11,10,3,4,9 will match up with all except the rightmost jumper. The "IRQ3" and "IRQ4" positions are populated. These jumpers select the serial port IRQ. If a jumper is set at 2-3, that's the IRQ for the second COM port, if a jumper is set at 1-2, that's the IRQ for the first COM port. The rightmost jumper will most likely select the parallel port IRQ 5 or 7.

Robin4 wrote on 2024-04-07, 15:30:

The switch block seems to be for adresses for com and LPT.

If you install this in a board with a BIOS that prints the "System Configuration" box at the end of the POST, the BIOS will display the parallel port and serial port base addresses. You are also missing a setting to disable/enable the game port, but I'm afraid that you likely can not detect whether the game port is enabled unless you connect a PC joystick to it, or you insert a jumper on the pin header to emulate a permanently pressed button.

This should help you determine most of the switch settings by experimentation.

Are there other users that maybe have an idea what the brand could be.. ?

Also found one on this site:

https://computer-retro.de/Bilder/Multi-IO/MX1 … -Controller.jpg