The Commodore 1351 is similar in appearance to the mouse supplied with
Amiga computers of the time, but the two are not mutually compatible. In its default mode, it is a true proportional mouse, but by holding down the right mouse button when powering up the machine, it can be made to emulate its predecessor, the 1350 (which while physically a mouse acted electrically like a
joystick). The 1351 utilizes the
6581/8580 SID chip's
analog-to-digital converter, thus it is only compatible with the C64/C128 and will not work on the VIC-20 despite using the same 9-pin connector. An Amiga mouse, although electrically compatible with the C64, uses the paddle registers and will be much more CPU-intensive to read than the 1351. A few programs such as Interpaint support Amiga mice. The mouse was distributed with a user manual containing maintenance instructions,
pinouts, and sample
BASIC and
machine language programs for the Commodore 64 and 128. Also included was a diskette containing diagnostic tools, demos, drivers, and an upgrade for the
GEOS operating system. The first mouse released for the C64 was the NEOS Mouse in 1985 by the company Nihon Electronics Co. Ltd., however it was quickly superseded when Commodore introduced their own mouse the following year. A handful of drawing programs, GEOS, and the C64 port of
Arkanoid can use the NEOS Mouse. == Reception ==