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In case anyone else runs into this issue in the future, it turned out to be a faulty LAG IC in my case. I checked the 68k with a logic analyser and found that it was stuck in this loop for way to long: This lead me to check the LAG vsync output which was running at 980Khz, rather than the 60hz...

Hi @fri0701, did you ever find a solution to this issue? I have a 512K ED which had a MacSnap 524S installed with the same symptoms. Long distorted bong, horizontal line after a while. Both with and without the expansion installed

I'm currently working on a small project to permanently attach a Raspberry Pi to my IIci over the RS-422 serial ports. So far I got everything working except for hardware flow control. The RS-232 USB adapter I'm using is definitely capable of using it when connecting to a similarly vintage...