Editing Apple Lisa Mouse

{{Infobox computer peripheral
| image = [[File:Apple Lisa Mouse.jpg]]
| caption = Apple Lisa Mouse (Model A9M0050)
| manufacturer = Apple Computer, Inc.
| type = Pointing device
| released = January 1983
| discontinued = 1985
| price = Included with Lisa system
| interface = DE-9 serial
| compatible = Apple Lisa, Macintosh XL, Macintosh 128K/512K/Plus, Apple IIc/IIc+/IIe
| dimensions = 90 mm × 60 mm × 34 mm
| weight = ~140 g
| predecessor = None (Apple's first mouse)
| successor = [[Macintosh Mouse]] (M0100)
| model = A9M0050
}}

The '''Apple Lisa Mouse''' (model A9M0050) was Apple's first commercially produced mouse and one of the first mice ever sold to consumers. Included with the [[Apple Lisa]] in January 1983, it was developed from the mouse used on the Xerox Alto. The Lisa Mouse established the single-button design philosophy that Apple maintained for over two decades.

== Development ==

=== Xerox PARC Influence ===
In 1979, Apple arranged a visit to Xerox PARC to view experimental technology including the mouse invented by Douglas Engelbart at SRI International. The three-button Xerox mouse cost over US$400 to manufacture—impractical for a consumer product.

=== Hovey-Kelley Design ===
Apple commissioned Hovey-Kelley Design (later IDEO) to develop a mouse that could be manufactured for US$25 instead of US$400. The design team, including case designer Bill Dresselhaus, built hundreds of prototypes and conducted extensive consumer testing.

Key design decisions included:
* Single button (reducing cost and complexity)
* Size roughly matching a deck of cards
* Art Deco-inspired curved lines matching the Lisa's design language
* Standard squeeze-release DE-9 connector

== Design ==

=== Physical Construction ===
The Lisa Mouse features a beige case with formal curving lines:
* Rounded rectangular body
* Single button with contrasting taupe accent
* Steel tracking ball (unique to the Lisa Mouse)
* DE-9 serial connector

Dimensions: approximately 90 mm × 60 mm × 34 mm.

=== Steel Ball ===
Unlike subsequent Apple mice that used rubber-coated steel balls, the Lisa Mouse uses a bare steel tracking ball. This design choice was abandoned in the Macintosh Mouse for improved traction.

=== Internal Mechanism ===
* Opto-mechanical tracking system
* Two encoder wheels with optical interrupters
* Single Omron-type microswitch
* Controller circuitry generating quadrature signals

== Compatibility ==

The Lisa Mouse connects via DE-9 serial and works with:
* Apple Lisa (all models)
* Macintosh XL
* Macintosh 128K, 512K, and Plus
* Apple IIc, IIc+, IIe (with appropriate card/port)

The mouse is electrically compatible with the [[Macintosh Mouse]] (M0100), though the cases differ cosmetically.

== Part Numbers ==

{| class="wikitable"
|-
! Number !! Type
|-
| A9M0050 || Model number
|-
| 825-0415-C || Part number (bottom label)
|-
| 661-93111 || Service exchange part
|}

== Serial Numbers ==

Lisa Mouse serial numbers are six digits, starting from early production numbers (e.g., 003875, 003944) up to higher production units (e.g., 045244). Low serial numbers are considered more collectible.

Computer History Museum examples document serial numbers including 003875 and 045244.

== Specifications ==

{| class="wikitable"
|-
! Parameter !! Value
|-
| Model number || A9M0050
|-
| Dimensions || ~90 mm × 60 mm × 34 mm
|-
| Weight || ~140 g
|-
| Button || Single mechanical
|-
| Tracking || Opto-mechanical ball
|-
| Ball material || Steel (uncoated)
|-
| Ball diameter || ~22 mm
|-
| Interface || DE-9 serial
|-
| Cable length || ~1.2 m
|-
| Case color || Beige
|-
| Case material || ABS plastic
|}

== Maintenance ==

=== Ball Cleaning ===
# Rotate ball retainer to remove
# Extract steel ball
# Clean ball with lint-free cloth
# Clean encoder wheels and rollers with isopropyl alcohol
# Remove debris with compressed air
# Reassemble

The steel ball does not absorb oils like rubber-coated balls, but dirt accumulation on encoder rollers causes erratic tracking.

=== Common Issues ===

{| class="wikitable"
|-
! Problem !! Cause !! Solution
|-
| Erratic cursor || Dirty encoder wheels || Clean internals
|-
| No movement || Cable break, failed encoder || Test cable continuity
|-
| Button fails || Worn microswitch || Replace switch
|-
| Intermittent || Corroded connector || Clean DE-9 pins
|}

== Collecting ==

=== Significance ===
The Lisa Mouse holds historical importance as:
* Apple's first mouse
* One of the first commercially available mice
* Foundation design for two decades of Apple mice

=== Condition Grades ===
* '''Mint:''' No yellowing, perfect operation, original box
* '''Excellent:''' Minimal yellowing, fully functional
* '''Good:''' Moderate yellowing, functional
* '''Fair:''' Significant yellowing, functional issues
* '''Poor:''' Non-functional or severe damage

=== Market Value ===
Lisa Mice command premium prices due to their historical significance and relative scarcity. Boxed examples in original packaging are particularly valuable. Low serial numbers (under 10,000) attract additional collector interest.

Auction houses including Bonhams have sold Lisa Mice as collectibles, with original box examples described as "Apple's first mouse as new in original box."

=== Authentication ===
* Verify A9M0050 model number on bottom label
* Confirm steel (not rubber) tracking ball
* Check serial number format (six digits)
* Verify beige case color matches Lisa aesthetic

== Legacy ==

The Lisa Mouse established Apple's design philosophy for pointing devices that persisted until the Mighty Mouse in 2005:
* Single-button simplicity
* Compact rectangular form factor
* Focus on consumer usability over power-user features

The testing methodology developed by Hovey-Kelley became a template for user-centered design in the tech industry.

== See Also ==
* [[Apple Lisa]]
* [[Macintosh Mouse]]
* [[Apple Desktop Bus Mouse]]

== References ==
* Computer History Museum collection records
* Wikipedia — Apple pointing devices
* Bonhams auction documentation
* Iconic Antiques product listings

[[Category:Apple Vintage Accessories]]

{{Navbox-AppleVintageAccessories}}