I recently got a PS2 for the first time ever and I already set it up with FMCB, a HDD, various homebrew, & the PS2 to HDMI adapter. The adapter was one of the first things I ordered (from Aliexpress), as I have no space for Component cables or those frame meister type boxes. Anyways, I discovered GSM and tried it out but kept getting weird looking pictures, figured it might have something to do with the HDMI adapter. Upon looking it up I find conflicting information saying the adapter takes...
GSM Vs. HDMI
GSM Vs. HDMI