It used also another device, the RamCard, increasing its capabilities. The card is no longer sold by Creative Micro Designs since 2001, the distribution was taken over from 2001 to 2009 by the U.S. company Click Here Software Co., but it's unclear if any were manufactured after 2001.
The unit can have up to 16 MB RAM installed. The unit sported a "Turbo" switch which, when enabled, clocked a Commodore 64 or Commodore 128 up to 20 MHz. The unit plugs into the expansion port of the computer. The unit uses 0.4 A and shadow ROM in 128 kB of RAM. Internal ROM was 128 kB. Using the RamCard (SuperCard), Fast page (FPM) not EDO memory modules with PS/2-SIMM socket can be used in the capacities of 1, 4, 8 or 16 MB.
- archive.org/geocities.com: CMD Product review, CMD SuperCPU (from 2008)
- "SuperCPU coding competition for 2006. - Commodore 64 (C64) Forum". lemon64.com. 2006-02-26. Retrieved 2013-05-26.
- "The Unofficial CMD Homepage - SuperCPU". cmdweb.de. 2010-04-18. Retrieved 2013-05-26.
- "SuperCPU General Specifications". webcache.googleusercontent.com. 1996. Retrieved 2013-05-26.
- "The SuperCPU FAQ". supercpu.cbm8bit.com. 2013-01-01. Retrieved 2013-05-26.