!!!Turbo 1050 

Turbo-1050 is a german Floppy-Driver speed and double density extension by Bernhard Engl.

!!Press

[Review in german magazine "Happy Computer"|http://www.stcarchiv.de/hc1986/08_1050turbo.php] by Julian Reschke
!!Documentation:

[Addendum to the Turbo-1050 Handbook|Turbo1050 Upgrades/Turbo1050Ergaenzung_final.pdf]