The PPC 512's small
LCD display was replaced by an
RF modulator, so that the machine could display CGA video on a domestic television, and the keyboard and system unit were combined in an integrated case, similar to the original
Atari ST and
Amiga 500. The PPC 512 second
floppy drive bay was replaced by two
ISA slots, though the design of the case was such that any cards fitted would protrude from the top of the computer. Some PC20s omitted the RF modulator and its support circuitry. Although the PC20/PC200 does not support standard floppy disk drives through the built-in
FDD connector, it uses a compatible floppy disk controller (a
Zilog Z765a). Standard drives can be made to work with 720K disks after a cable modification. ==References==