Home > Gallery, Micro Peripherals Ltd, Retro Computers and other stuff..., Sinclair family > Micro Peripherals Ltd Floppy Disk Interface for Sinclair QL

Micro Peripherals Ltd Floppy Disk Interface for Sinclair QL


This is a disk interface system made by Micro Peripherals Ltd which was later badged by Sinclair as their “official” disc system.

It used its own software (written by Richard Miller) and did not conform to the QJump “FLP” system used by most companies at the time (it used the name FDK to access the disk drives). The fact that the device name was not “FLP” put a lot of users off. The unit does not support direct sector access.

The interface had an 8K onboard EPROM providing the device driver and toolkit extensions, which included:

  • DGET – Load sector into an array
  • DPUT – Save an array to a sector
  • MSET, FSET – Toggle microdrive emulation mode
  • VSET – Rename the disk device (the interface normally uses the drive name FDK rather than the FLP used by most other QL disk systems)

Plus several other extensions similar to those in other disk interfaces, and some utility programs such as a disk and memory editor were supplied on disk.

The interface was supplied with either one, or a pair of DSDD 720KB drives, the first of which took its power from an external transformer via a 6-way power connector, and the second took its power from the DC output of the first drive via a 5-way connector, plus a ribbon connector from one drive to the other.

The interface had switch-selectable options via a series of jumpers to format single or double sided, and 3ms or 6ms track to track time. Another jumper could be set to make the QL boot from an ‘mdv’ named disk.

Powersupply Pinout:


source: rwapadventures.com

  1. Cercamon
    October 24th, 2016 at 19:36 | #1


    hai per caso lo schema pinout del plug di alimentazione DIN a 6 poli del disk drive Micro Peripherals che compare nel tuo post? Ho un QL con l’interfaccia MicroP e il diskdrive ma non ho trovato l’alimentatore. Credo che ci siano solo due tensioni sul DIN6 (12V e 5V) ma non ho lo schema. Vorrei trovare un adattatore che possa sostituire la PSU originale. Grazie.

    David – Lugano

  2. David
    October 31st, 2016 at 12:28 | #2