The CYC1000 and MAX1000 both has a selectable 2 pins with pull up and pull down.
Can be seen in CYC1000 the pull programable with a 4k7ohm "up or down" that is selectable in pins K1 & L1.
Can be seen in MAX1000 the pull programable with a 4k7ohm "up or down" that is selectable in pins B11 & G13.
There are cores in the future that uses a usb-keyboard using a Logitech Unifiing wireleSs technologie.
Selected both pins In pull down -> USB-DIRECT
Selected both pins In pull up -> PS2
The core we use for direct boot keyboard is:
THIS IS POSIBLE WITH THE WORK OF THESONDERS FOR A BUNCH OF MONTHS: