Commodore PET
Mainly due to the popularity of a UK clone of the Superboard computer called the UK101, the bugs in the BASIC ROMs were eventually fixed, and at least two third-party companies produced their own version of the OS. One version was called 'CEGMON', the other was 'WEMON' produced by Watford Electronics in the UK. Both featured full screen editing (almost identical to the commodore PET), Named cassette file handling (like the PET) and a greatly Improved machine code monitor (also very similar to the Commodore PET).