Service ROMs
3rd party ROMs generally also support command abbreviation, leading to ambiguity where two service ROMs provide commands which are very similar in name but possibly different in functionality. In this case the MOS would prioritise the command from the ROM in the higher numbered ROM slot - i.e. 7 would take precedence over 6.
Some 3rd party suppliers would get around this by prefixing their star commands with other letters - for example Watford Electronics ROMS would have their star commands prefixed with "W" therefore making them unique.
Read more about this topic: Acorn MOS
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