The CM4 does not have an sd card slot itself, but the uConsole has one. So, if you keep the OS on the SD card (as you would if you were using an A04 or A06 or R01 core), then yes, you wouldn’t need an IO-Board.
The CM4 does not have an sd card slot itself, but the uConsole has one. So, if you keep the OS on the SD card (as you would if you were using an A04 or A06 or R01 core), then yes, you wouldn’t need an IO-Board.