Mythic66 developed an IO-card for the Commodore VIC20 computer. The features are: High speed RS-232 port (1200,2400,9600 and 19200 Baud), IEEE port and a full 35k RAM expansion. The cartridge also has a ROM for 8 slots of 8 kB of programs (Slot 0 is for VIC-IO software and slot 1 is for the IEEE software).