 The ZX8302, or "Peripheral Chip", interfaced to the RS-232 ports (transmit only) Microdrives, QLAN ports, real-time clock and the 8049 via a synchronous serial link.The 8049 included at late stage in the QL's design, the ZX8302 originally being intended to perform its functions ran at 11 MHz and acted as a keyboard/joystick interface, RS-232 receive buffer and audio generator.QDOS, a pre-emptive multitasking operating system primarily designed by Tony Tebby, was included on ROM, as was an advanced structured BASIC interpreter, named SuperBASIC designed by Jan Jones, which was also used as the command-line interpreter.