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Mouse Systems Corporation (MSC), formerly Rodent Associates, was founded in 1982 by Steve Kirsch, inventor of the optical mouse. The company was responsible for bringing the mouse to the IBM PC for the first time.
Mouse Systems' optical mouse, wired to a Sun workstation and an Atari 400 running Missile Command, attracted many observers at the October, 1982 Mini/Micro '82 conference in Anaheim, attended by over 10000 people—and won a "best new product" award.
Like all early optical mice, their debut product relied on a special metallic and reflective mousepad printed with a square grid of grey and blue tracking lines: as the device moved over the pad, light emitted by an LED was reflected by the pad onto an array of sensors whose output was processed by an on-board controller, which in turn supplied the host computer with machine-readable tracking data via an RS-232 serial port. An external power supply was required. Some mice would derive their power supply from the keyboard connector on the motherboard and came with a pass-through connector to be inserted before the keyboard cable.
Early Sun workstations used MSC optical mice exclusively. Initial models came with large mousepads with well-spaced lines, while later models were smaller and used a much tighter grid.
In 1982 MSC acquired rights to PCPaint from Microtex Industries, the first mouse-driven image manipulation program for the IBM PC, written in assembly language by Doug Wolfgram. Mouse Systems wanted the software re-developed to look more like Apple's MacPaint so Wolfgram brought in co-developer John Bridges and together they re-wrote the program in C with an updated user interface. Millions of copies were shipped, primarily bundled with all their mice until the early 1990s.
- Markoff, John Gregory (1982-05-10). "Computer mice are scurrying out of R&D labs". InfoWorld. 4 (18). Berkeley, CA, USA: Popular Computing, Inc. pp. 10–11. ISSN 0199-6649. Retrieved 2015-08-26.
- Markoff, John Gregory (1982-05-17). "Rodent Associates make computer mice". InfoWorld. 4 (19). Sunnyvale, CA, USA: Popular Computing, Inc. p. 12. ISSN 0199-6649. Retrieved 2015-08-26.
- Mace, Scott (1982-10-11). "Speech tech, mice draw crowds at Mini/Micro 82". InfoWorld. 4 (40). Anaheim, CA, USA: Popular Computing, Inc. pp. 1, 6–7. ISSN 0199-6649. Retrieved 2020-02-07.
- Paul, Matthias R. (2002-04-06). "Re: [fd-dev] ANNOUNCE: CuteMouse 2.0 alpha 1". freedos-dev. Archived from the original on 2020-02-07. Retrieved 2020-02-07.
[…] The original Mouse Systems Bus Mouse is a normal serial 8250 compatible mouse using the normal Mouse Systems serial protocol, however the base address of this 8250 type chip is not one of the usual COM port addresses 3F8h, 2F8h, 3E8h, or 2E8h, but either 238h or 338h. Besides others these addresses are also supported as alternative addresses for serial ports on the German c't UniRAM add-on ISA card. […] Bus mice from other vendors use completely different interfaces, partially residing at the same I/O addresses […]