The first #Atari #ST product for which I have created a video on my Youtube channel: The laser mouse upgrade for the #STM1 mouse.
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Das erste Atari ST Produkt, zu dem ich auf meinem Youtube Kanal ein Video erstellt habe: Das #Laser-Maus Upgrade für die STM1 Maus.

https://youtu.be/dfqeYyMNS_w?si=cAoTRKX5OO7rVpYL
(sorry for bad sound quality)

Why does it still matters? Well... There is now Version 2 of the board - even V1 is abloutly recommended. You may also take a look here.

https://lavago.de/RETRO-COMPUTING/
(No paid ad)