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Micromys V3
Micromys V4



PS2 mouse adapter

Micromys V3/V4 lets you use a modern optical mouse with your C64, Amiga or Atari ST/Falcon computer. A USB mouse can be used with a USB to PS2 adapter, provided that the mouse supports the PS2 protocol. While other interfaces may offer the same functionality, Micromys V3/V4 have their strength in the small details: The flexible mechanical construction does not put mechanical stress on the mouse/joystick port of your computer. Even the mouse wheel can be used in C64 and Amiga programs. Hot-plugging is supported, and operation with KVM switches is flawless, while our competitors often don't work at all in such configurations.

For the C64, the adapter will emulate a Commodore 1351 proportional mouse. Programs like Prophet64, MSSIAH, Geos, GoDot and others that use a mouse will work without any additional drivers and with the comfort of a modern mouse or trackball. Even the joystick-emulation mode of the 1351 is implemented!

Atari ST/Falcon users can only use two mouse buttons, but will enjoy the hot-plug compatibility, which has not been demonstrated by any other mouse adapter for that computer.

For the Amiga, there's two modes of operation: One that allows using the adapter without any drivers, emulating a 3-button mouse (as shipped with some A3000 models), and another mode that allows using the mouse wheel in conjunction with our free driver. Both modes work flawlessly without any drivers and let you use the Amiga's early startup menu.

Micromys V3

Micromys V3 can be configured for the different target systems by DIP switches. Read more about the product on the dedicated Micromys_V3 page.

In case you wondered what happened to "Micromys V2", it's an intermediate design that was never available in the shops. Individual Computers has bought the design in a half-working state from Marko Herold and did major updates to the code, which justified the version bump to V3. The design is RoHS compliant now, and it's compatible with Amiga and Atari ST. The new design uses a new chip version that is RoHS compliant and ensures the availability of Micromys V3 for many years in the future.

Micromys V4

Micromys V4 is the next generation of Micromys which implements a highly sophisticated auto-detect function of the host computer, so DIP switches are not required any more. Further, the case has become a lot smaller, and we have increased the length of the cable, which makes using the adapter on Atari ST and Falcon a lot easier.

Micromys V4 of course retains the high compatibilty of its predecessor, the Micromys V3 adapter. USB mice supporting the PS/2 protocol also work with the Micromys adapter. These are usually shipped with an adapter from USB to PS2.

In order to deal with space constraints on every desk, the Micromys V4 comes with a longer cable than it's predecessor. This design allows installation on every narrow desk, even when a bulky USB-PS/2 adapter is being used. Please note that due to the space constraints around the Amiga 600 mouse port and port 1 of the Commodore 128, an additional adapter with a smaller plug or modification of the Micromys plug is required.

Modes of operation

Amiga wheel mode

Just plug in and switch on. Device will auto-detect that it's connected to an Amiga and switch to 2-button mode with wheel support. Wheel and middle-mouse button can be activated with our driver. No further connections to the Amiga are required: Wheel and middle mouse button data is all transferred through the same mouse port, and the joystick port remains free.

Amiga 3-button mode without drivers

Since you don't have DIP switches on Micromys V4 any more, the 3-button mode for Amiga computers is entered only by holding down the middle mouse button while the computer is starting. This will disable the wheel functions of Micromys V4, but enable the middle mouse button that does not require any driver. In this mode, Micromys will emulate a mouse just like the rare 3-button mice that have been shipped with some A3000 models. The middle mouse button is supported by programs like DirOpus 4. This mode stays active until the next power cycle. A machine reset does not alter the mode of operation - only a power-cycle does.

Atari ST/STe/Falcon

Just plug in and switch on. Micromys will auto-detect that it's connected to an Atari and switch to that mode. The Atari mode supports two mouse buttons, additional buttons or a mouse wheel are ignored.

The following models could not be tested, but should work flawlessly with the Micromys adapter anyway: Atari Stacy, Atari TT 030, C-LAB Falcon, ATW (Atari Transputer Workstation 800 - ABAQ).

C64 or C128 in joystick port 1

This is the usual port for a 1351 mouse. Most programs use it for the proportional mouse, because the GEOS operating system expects the mouse there. If Micromys V4 is plugged into port 1, it detects the machine and switches to 1351 mode. Should the user hold down the right mouse button during power-up, the unit goes to joystick emulation mode, just like the real 1351 mouse would do.

C64 or C128 in joystick port 2

This is a rather unusual port for a proportional mouse. However, the popular music programs MSSIAH and Prophet64 use the mouse in that port, so we're also covering this mode of operation. If the user wants to use joystick port 2, then Micromys must be attached to port 2 after the program has been started. The program must be set to use the mouse, and then the adapter can be attached to port 2. Since auto-detect in port 2 is highly depending on software (thus may not always work), Micromys V4 can be configured to be C64-only by removing the auto-detect jumper inside the case. Once the jumper is removed, the auto-detect sequence is bypassed and the unit will work in C64-only mode on any port of any computer. This will also let you use the joystick emulation mode on other computers than the C64.


Amiga driver for 68020 and higher processors; install script: Micromys.lha (June 2009)
Amiga driver only, re-compiled for 68000 processor (binary only): Micromys_68000.lha (March 2013)



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