Commodore 1351 Guia Del Usuario página 34

PROPORTIONAL MOUSE
DEVELOPER'S GUIDE
This section explains the theory of operation of the Commo-
dore 1351 mouse and suggests ways in which it can be interfa-
ced to applications or software.
INTRODUCTION
The Commodore 1351 mouse for use with the C64/C128 pro-
duct line is a small two-button device which is connected to
either of the joystick ports on the C64/C128.
The mouse supports two distinct operating modes:
1) Joystick mode.
2) Proportional mode.
Proportional mode is usable with the C64 or the C128, and re-
quires a special machine language driver to yield optimum
performance.
Mode selection is determined when the mouse is powered up.
If the user depresses the right mouse button when the device is
powered up, then the mouse will be in joystick mode.
If the user does not depress the right mouse button when the
device is powered up, then the mouse will default to proportio-
nal mode.
Joystick mode allows you to utilise the mouse as a joystick
when using software which does not support proportional
mode.
JOYSTICK MODE
In joystick mode the mouse operates as follows:
1) If the mouse is moved, then the approriate joystick lines are
activated for a period of 20 ms. Thus moving the mouse is
like pushing the joystick in the appropriate direction.
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