Mouse Systems developed the A+ Mouse for the Apple IIc, the c standing for a compact version of Apple's IIe computer. The Apple IIC (Apple //c or Apple IIc) was the first computer designed to be portable. A+ Mouse provides an optical alternative to Apple's own Apple Mouse IIc, a ball mouse. According to Apple's preferred mouse style, the A+ has only one button. Except for the single button, it looks like other M-2 models. Its serial number begins with M2.
The MOUSE SYSTEMS brand on the back of the A+ Mouse is accompanied by a holey cheese wedge icon, as do other M-2 mouse models. On the box, however, the MOUSE SYSTEMS brand appears in block italic font with the two triangular styled mouses in outline and solid. This logo appears on M-3 and M-4 models, suggesting this A+ mouse came later than the //c's April 1984 release date.
The A+ came without an external power supply. Intending to be a portable, the IIc computer had an integrated serial port into which the mouse connects directly to the computer with a DE-9-pin plug, receiving its power from the computer. The external power supply was eliminated for the M-3 Mouse System mouses and thereafter. Perhaps the A+ development fostered that advancement.
The bottom of the Mouse Systems A+ Mouse for the Apple IIc matches the diagram on its box. On the mouse bottom, the two oblong holes for the LEDs are parallel, not slanted as on the M-1 model.
The box proclaims that, "A+ Mouse glides quietly and accurately over the mouse pad with no skipping." And, "Optical mouse technology means no moving parts, long life and maintenance-free operation."
The pad is the reflective gridded metal desk pad that came with the M-2 Mouse Systems mouses.
Mouse Systems A+ Mouse on an Apple IIc courtesy of the Montana Museum of Technology collection.