Amongst their other hardware, Silicon Express produced their own Centronics Printer Interface.
The interface plugged into SER1 or SER2 and converted printer output from those ports into a form suitable for a parallel printer. It was supplied with 3 metres of cable.
Title: Silicon Express Centronics Printer Interface
Interface Type: Serial to Parallel Convertor
Connection: QL Serial Ports
Through-Connector: No
Manufacturer: Silicon Express
Year First Sold: 1985
Original Price: £29.95
Download Manual: Unknown
Accompanying Software: None