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Full circuit documentation for converting the Sinclair QL’s 9600-baud serial RS232 output to Centronics parallel format, enabling use of standard parallel printers. Explains operation of the 74HC02 NOR gate, TL0556 timer, and 74HC164 serial-to-parallel shift register with detailed adjustment instructions for clock frequency (9600 Hz) and frame byte timing. Circuit schematic appears on the cover page.