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Dépraz / Digimouse mouse

The Swiss Mouse appears under more than one name and color. It came in white, beige, clear, and special colors: blue with white buttons for the IDS company P4 and turqoise blue with red buttons for the Smaky Mouse. But the most common color was the smooth bright red body with its springy black buttons. AT&T favored the hot red mouse known in their box as the Digimouse.

Early Depraz mouse
Early Depraz mouse
Older Dépraz mouse photo. One button missing.

Logitech's LogiMate interface adapter produced in 1984 enabled IBM PCs to use their mouse directly without special software or hardware modifications. Logitech OEM customers included Convergent Technologies, DEC, Hewlett-Packard, and AT&T. The newer mouse here comes packaged in an AT&T box as if hardly used.

Newer Depraz mouse compared to older
Newer Digimouse photo, left. Older Dépraz Mouse, right.

Without dismantling the mouses, the only visible design changes between the newer Digimouse and the older Dépraz Mouse are in the ball and housing and labeling. The Digimouse is in new condition.

  • Instead of a steel ball like the older mouse's, a transluscent hard plastic ball moves freely in a larger opening in the Digimouse's retainer ring.
  • The four tiny plastic gliders stand a fraction of an inch taller on the newer mouse than on the older Dépraz labeled mouse.
  • The motherboards look different behind the housing opening: Green, with more visible circuitry on the newer compared to a plainer yellowish older one.
  • The rollers are all plastic on the younger mouse. The older one's spring loaded roller is plastic but the larger fixed rollers are metal.

Besides the missing button from the older Dépraz Mouse, its metal ball hardly rolls as a consequence of a little corrosion and a lax spring. Cleaning the rollers might help.

Ergonomically, the mouse dome is pleasant to hold. Its hemispherical 3 ½" diameter is pruned on the thumb and pinky finger sides for a nice grip 3" wide. A small hand can easily rest its wrist on the desk and slide up to use the buttons as necessary because its 1 ¾" height is a bit tall for a prolonged position on top. The buttons spring back and click definitively.

Logitech Mouses

P4 Mouse
Dépraz mouse
Transparent Dépraz

Newer Depraz mouse
AT&T mouse labeled Digimouse

AT&T box
AT&T Digimouse box

Newer Depraz mouse in AT&T box
AT&T Digimouse in its box

The older mouse's silver colored label reads:

Depraz Mouse
Type D 83 / P Serial
No 11075
Made in Switzerland

The younger mouse's white paper label reads:

Type 1000 P
No 46118

A second paper label reads:


The box reads:

Data Terminal
Made in Switzerland

External Links

-André Guignard - Wikipedia
-Jean-Daniel Nicoud - Wikipedia
-A white P-4 Dépraz Mouse - Wikispaces
-Smaky computer and mouse - Wikipedia
-Logitech - internet-story.com
-René Sommer dies - WRS