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Viglen Master
Cartridge System
What a good idea! This cartridge allows the small Viglen cartridges developed for the BBC Model B to be used on the Master. The cartridge plugs into one of the ROM slots and the Viglen cartridges plug into the top.
In a lot of ways this is better than the usual Master ROM cartridges. ROMs can be given a permanent home in one of the Viglen cartridges and then plugged in when required. The cartridges protect the ROMs and keep them clean.