Serial RS232 Mouse - Revision history

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2017-10-12T12:25:08Z

Ygdrazil at 07:15, 1 September 2014

2014-09-01T07:15:12Z

Nocash at 20:14, 5 February 2010

2010-02-05T20:14:33Z

Nocash: /* Mouse Systems Serial Mouse (rare) */

2010-01-08T23:45:47Z

‎Mouse Systems Serial Mouse (rare)

Nocash at 22:53, 8 January 2010

2010-01-08T22:53:25Z

Nocash at 22:30, 8 January 2010

2010-01-08T22:30:34Z

Nocash: Created page with 'Serial RS232 mice could be connected to RS232 interfaces, such like the Amstrad Serial Interface, or to other (in-)compatible Serial interfaces (see Peripherals for a com…'

2010-01-08T22:22:24Z

Created page with 'Serial RS232 mice could be connected to RS232 interfaces, such like the Amstrad Serial Interface, or to other (in-)compatible Serial interfaces (see Peripherals for a com…'

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Serial RS232 mice could be connected to RS232 interfaces, such like the [[Amstrad Serial Interface]], or to other (in-)compatible Serial interfaces (see [[Peripherals]] for a complete list of known Serial interfaces).

With their hardware based motion-counters, these mice would give much better resolution than the [[AMX Mouse]]. Another approach to use a RS232 mouse would be a mouse interface like the [[AMX Kit]], though that'd cripple the resolution to the AMX level.

== Standard Serial Mouse (most common) ==
A serial mouse should be read at 1200 bauds, 7 data bits, no parity, 1 stop bit (7N1) with DTR and RTS on. For best compatibility, the mouse should output 2 stop bits (so it could be alternately also read as 7N2 or 8N1). When the mouse gets moved, or when a button gets pressed/released, the mouse sends 3 or 4 characters:

__First Character____________________
6 First Character Flag (1)
5 Left Button (1=Pressed)
4 Right Button (1=Pressed)
2-3 Upper 2bit of Vertical Motion
0-1 Upper 2bit of Horizontal Motion
__Second Character___________________
6 Non-first Character Flag (0)
5-0 Lower 6bit of Horizontal Motion
__Third Character____________________
6 Non-first Character Flag (0)
5-0 Lower 6bit of Vertical Motion
__Fourth Character (if any)__________
6 Non-first Character Flag (0)
5 Middle Button (1=Pressed)
4 Unused ???
3-0 Wheel ???

Additionally, the mouse outputs a detection character (when switching RTS (or DTR?) off and on:

"M" = Two-Button Mouse (aka "Microsoft" mouse)
"3" = Three-Button Mouse (aka "Logitech" mouse)
"Z" = Mouse-Wheel

Normally, the detection response consist of a single character (usually "M"), though some mice have the "M" followed by 11 additional characters of garbage or version information (these extra characters have bit6=0, so after detection, one should ignore all characters until receiving the first data character with bit6=1).

== Mouse Systems Serial Mouse (rare) ==
Accessed at 1200 bauds, just like standard serial mouse, but with 8N1 instead 7N1, and with different data bytes.

__First Byte_________________________
7-3 First Byte Code (10000b)
2 Left? Button (0=Pressed)
1 Middle? Button (0=Pressed)
0 Right? Button (0=Pressed)
__Second Byte________________________
7-0 Horizontal Motion (X1)
__Third Byte_________________________
7-0 Vertical Motion (Y1)
__Fourth Byte________________________
7-0 Horizontal Motion (X2)
__Fifth Byte_________________________
7-0 Vertical Motion (Y2)

The strange duplicated 8bit motion values are usually simply added together, ie. X=X1+X2 and Y=Y1+Y2, producing 9bit motion values.

== Notes ==

Mice do return raw mickeys, so effects like double speed threshold must (should) be implemented by software.

← Older revision		Revision as of 12:25, 12 October 2017
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	Mice do return raw mickeys, so effects like double speed threshold must (should) be implemented by software.		Mice do return raw mickeys, so effects like double speed threshold must (should) be implemented by software.

−	[[Category:Serial interfaces]]	+	[[Category:Input Device]] [[Category:Serial interfaces]]

← Older revision		Revision as of 07:15, 1 September 2014
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	Mice do return raw mickeys, so effects like double speed threshold must (should) be implemented by software.		Mice do return raw mickeys, so effects like double speed threshold must (should) be implemented by software.
		+
		+	[[Category:Serial interfaces]]

@@ Line 1: / Line 1: @@
 Serial RS232 mice could be connected to RS232 interfaces, such like the [[Amstrad Serial Interface]], or to other (in-)compatible Serial interfaces (see [[Peripherals]] for a complete list of known Serial interfaces).
-With their hardware based motion-counters, these mice would give much better resolution (5120 mickeys/second) (forty 3-byte packets/second) than the [[AMX Mouse]] (300 mickeys/second). Another approach to use a RS232 mouse would be a mouse interface like the [[AMX Kit]], though that'd cripple the resolution to the AMX level.
+* With their hardware based motion-counters, these mice would give much better resolution (5120 mickeys/second) (forty 3-byte packets/second) than the [[AMX Mouse]] (300 mickeys/second). Another approach to use a RS232 mouse would be a mouse interface like the [[AMX Kit]], though that'd cripple the resolution to the AMX level.
 == Standard Serial Mouse (most common) ==

@@ Line 1: / Line 1: @@
 Serial RS232 mice could be connected to RS232 interfaces, such like the [[Amstrad Serial Interface]], or to other (in-)compatible Serial interfaces (see [[Peripherals]] for a complete list of known Serial interfaces).
-With their hardware based motion-counters, these mice would give much better resolution (5120 mickeys/second, forty 3-byte packets/second) than the [[AMX Mouse]] (300 mickeys/second). Another approach to use a RS232 mouse would be a mouse interface like the [[AMX Kit]], though that'd cripple the resolution to the AMX level.
+With their hardware based motion-counters, these mice would give much better resolution (5120 mickeys/second) (forty 3-byte packets/second) than the [[AMX Mouse]] (300 mickeys/second). Another approach to use a RS232 mouse would be a mouse interface like the [[AMX Kit]], though that'd cripple the resolution to the AMX level.
 == Standard Serial Mouse (most common) ==

@@ Line 32: / Line 32: @@
 Normally, the detection response consist of a single character (usually "M"), though some mice have the "M" followed by 11 additional characters of garbage or version information (these extra characters have bit6=0, so after detection, one should ignore all characters until receiving the first data character with bit6=1).
-== Mouse Systems Serial Mouse (rare) ==
+== Mouse Systems Serial Mouse (quite rare) ==
 Accessed at 1200 bauds, just like standard serial mouse, but with 8N1 instead 7N1, and with different data bytes.