Use this, Jerry:
dtoverlay=vc4-kms-v3d,noaudio
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I couldn't get dual HDMI monitors to work so I had to comment out the dtoverlay=vc4-kms-v3d line in config.txt. Otherwise, sbitx would not run because of the dreaded simple.c error from alsa sound. It probably has to do with HDMI audio being available on the monitor but I don't know enough about the alsa sound system to fix it. I also forced the Pi OS to use 800x480 mode for the display in the config.txt
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Jerry, AC9NM
手中的鸟在灌木丛中值两个
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Jerry Ponko, AC9NM
