Changes
/* Overview */
No 5V pin go to the pico. We use some 1 buffer, 1 level shifter, 3 multiplexers. We write to the CPC with 3.3V, we use 5V to the CPC only to drive some signal like A15 for C3 memory mode and IOReq to disable intern floppy.
We prefer to have somerthing between the Pico and the CPC, as even if it 5V work now, there is no guarantee that the boards will work after some years of intensive usage.
It is really better to be carefull.
