Sigma Research Parallel Printer Interface

The Sigma Research Parallel Printer Interface was a serial to parallel printer interface, which was very similar to the first version of the Miracle Centronics Interface.

The baud rate was fixed at 9600. There was a cable to the QL, and a second cable to the printer, with a metal centronics connector.

According to the review in QL User (December 1984), this centronics connector has a UART specifically designed for inputting serial data, and a ceramic resonator on the PCB, to give more accurate clock frequencies. The chips were also said to be CMOS type, resulting in a very low power consumption.

Title: Sigma Research Parallel Printer Interface
Interface Type: Serial to Parallel Convertor
Connection: QL Serial Port (SER1 only)
Through-Connector: No
Manufacturer: Sigma Research
Year First Sold: 1984
Original Price: £39
Download Manual: Unknown
Accompanying Software: None