2 channel D/A, 9600 baud serial port, 16 bit bidirectional boards, etc.

File system

RT-11 implemented a simple and fast file system employing six-character filenames with three-character extensions (6.3) encoded in RADIX-50, which packed those nine characters into only three 16-bit words (six bytes). This resulted in allowable filename characters being 'A'-'Z', 'a'-'z' forced to upper case, '0'-'9', '$', '%', '*'. Filenames could be prefixed by a device

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