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Created page with "{{Infobox computer peripheral | name = Apple Desktop Bus Mouse II | image = 250px | caption = Apple Desktop Bus Mouse II (Model M2706) | manufacturer = Apple Computer, Inc. | type = Pointing device | release date = January 1993 | discontinued = May 6, 1998 | price = US$89 (retail) | interface = Apple Desktop Bus | compatible = All ADB-equipped Macs, Apple IIGS, PowerBook (with adapter) |..."
 
Rewrite with Apple's TIL 11227 specs (200 ppi, 10 mA, size, weight, M2706LL/A); page said Apple published no per-device current. Add grey M2707 (was 'no M2707 documented'); Apple's sticking-button procedure (TIL 18560); remove uncited scheduled-maintenance, fuse, clicks-rating and production-figure narration; ADB facts cited to Family Hardware pages; release_date fixed
 
(3 intermediate revisions by the same user not shown)
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{{Infobox computer peripheral
{{Infobox computer peripheral
| name        = Apple Desktop Bus Mouse II
| name        = Apple Desktop Bus Mouse II
| image        = [[File:Apple_Desktop_Bus_Mouse_II.jpg|250px]]
| image        = [[File:Apple-ADB-mouse.jpg|260px|frameless]]
| caption      = Apple Desktop Bus Mouse II (Model M2706)
| caption      = Apple Desktop Bus Mouse II (M2706)
| manufacturer = Apple Computer, Inc.
| manufacturer = Apple Computer, Inc. (made by Logitech and Mitsumi)
| type        = Pointing device
| type        = Pointing device
| release date = January 1993
| release_date = 1993
| discontinued = May 6, 1998
| discontinued = 1998
| price        = US$89 (retail)
| interface    = [[Apple Desktop Bus]]
| interface    = [[Apple Desktop Bus]]
| compatible  = All ADB-equipped Macs, Apple IIGS, PowerBook (with adapter)
| compatible  = ADB-equipped Macintosh and Apple II computers
| dimensions  = 108 mm L × 62 mm W × 38 mm H
| weight      = 140 g (4.9 oz)
| predecessor  = [[Apple Desktop Bus Mouse]]
| predecessor  = [[Apple Desktop Bus Mouse]]
| successor    = [[Apple USB Mouse]]
| resolution  = 200 pulses per inch
| model        = M2706 (Platinum), M2706 (Black), M2707 (PowerBook Gray)
| power        = 10 mA maximum
| dimensions  = 106 × 62 × 33 mm
| weight      = 0.13 kg
| model        = M2706 (beige, black); M2707 (grey). Order no. M2706LL/A
}}
}}
<templatestyles src="Template:StyledTable/styles.css" />
The '''Apple Desktop Bus Mouse II''' (model M2706) replaced the [[Apple Desktop Bus Mouse]] as the standard Macintosh mouse. Deskthority dates it 1993-1998 and gives the FCC ID as BCGM2706.<ref name="dt">Deskthority wiki, [https://deskthority.net/wiki/Apple_Desktop_Bus_Mouse_II "Apple Desktop Bus Mouse II"]: part numbers M2706 (beige, black) and M2707 (grey), FCC IDs BCGM2706 and BCGM2707, made by Logitech and Mitsumi, one button, opto-mechanical, 1993-1998; Logitech and Mitsumi variants; black and grey versions; photographs. Community wiki, secondary source. Retrieved 2026-09-30.</ref> Its shape, rounder, with the ball forward of centre and a larger button across the front, was inspired by the third-generation Microsoft mouse and earned it the nickname "tear-drop mouse".<ref name="dt" />


The '''Apple Desktop Bus Mouse II''' was the second and final [[Apple Desktop Bus]] mouse produced by Apple Computer, introduced in January 1993. Marking Apple's third major mouse redesign in a decade, it abandoned the angular blocky design of its predecessor for a curved, ergonomic "teardrop" shape that influenced mouse design industry-wide. The mouse served as the standard pointing device for all Macintosh desktop computers from 1993 until its discontinuation on May 6, 1998, when it was replaced by the [[Apple USB Mouse]] accompanying the original [[iMac]].
Apple describes it as a low-power mouse for any Macintosh or Apple II with ADB, with an enlarged button and the ball at the front for precise control, which can plug into an ADB port on the computer or be daisy-chained from another ADB device. Apple's specifications give mechanical tracking with optical shaft encoding at 200 pulses per inch (7.87 per mm), a maximum current of 10 mA, a size of 33 mm high, 62 mm wide and 106 mm deep, and a weight of 0.13 kg. The order number was M2706LL/A.<ref name="til">Apple Computer, Tech Info Library article 11227, "Apple Desktop Bus Mouse II: Description and Specifications", created 6 January 1993. Hosted in [[:File:Apple Tech Info Library ADB keyboard and mouse articles.pdf]], PDF pp. 16-17.</ref>


== Design Evolution ==
== Variants ==
There are two makers, identifiable from the underside.<ref name="dt" />


The Apple Desktop Bus Mouse II represented a significant departure from Apple's previous angular mouse designs, drawing inspiration from the successful third-generation Microsoft Mouse. The teardrop-shaped body featured smooth, rounded curves with the tracking ball positioned forward of center and an enlarged button encompassing the entire front portion of the mouse. This ergonomic design proved so successful that it established the basic form factor for computer mice that persists in modern designs across the industry.
{| class="wikitable styled-table" style="width:95%;"
 
|+'''Identifying the maker'''<ref name="dt" />
The mouse maintained Apple's commitment to single-button simplicity, with the button spanning approximately 40% of the mouse surface area. The smooth curves eliminated the sharp edges of earlier models while maintaining an ambidextrous design suitable for both left and right-handed users.
! !! Logitech !! Mitsumi
 
== Model Variants ==
 
Three distinct color variants were produced during the mouse's five-year production run:
 
=== M2706 Platinum ===
The standard Platinum gray version (Pantone 423C) shipped with all Macintosh desktop computers from 1993-1998. This was the most common variant, matching Apple's standard computer coloring of the era.
 
=== M2706 Black ===
A rare black version was produced exclusively for:
* [[Macintosh TV]] (1993-1994)
* [[Macintosh Performa 5420]] (European and Asian markets only)
 
The black variant featured identical internals but commanded premium prices on the collector market due to its scarcity.
 
=== M2707 PowerBook Gray ===
A dark gray version matching the PowerBook 100 series aesthetic was offered as an optional accessory for PowerBook users. Model M2707 featured the same internal design but utilized the darker "Smoke" gray coloring to coordinate with portable systems.
 
== Manufacturing Variations ==
 
Four distinct internal designs were produced across different manufacturing facilities:
 
=== Taiwan Manufacture (Logitech) ===
'''Characteristics:'''
* Black tracking ball (19mm)
* Black ball cage
* Removable cable assembly
* Two screws under label
* PCB: Logitech 200343
* Part numbers: 400791-400793, 400685
 
'''Identification:''' Large label with two screws, serial numbers starting with 'M'
 
=== China Manufacture ===
'''Characteristics:'''
* Gray tracking ball (22mm)
* Integrated ball cage (no separate component)
* Single screw under serial number sticker
* Two-piece PCB design with Logitech controller
* Stamped label (unique among variants)
 
'''Identification:''' Serial numbers starting with 'L', second letter 'C' for China
 
=== Ireland/Malaysia Manufacture (Mitsumi) ===
'''Characteristics:'''
* Gray tracking ball (22mm)
* Separate ball cage component
* Single consolidated PCB
* Mitsumi controller chip
* Embossed text in plastic case
 
'''Identification:''' Serial numbers starting with 'M', second letter 'I' (Ireland) or 'B' (Malaysia)
 
=== USA Manufacture ===
'''Characteristics:'''
* Gray tracking ball
* White or black ball cage
* Three-screw PCB mounting
* Various controller chips
 
'''Identification:''' Serial numbers with USA designation
 
== Technical Specifications ==
 
=== Physical Specifications ===
* '''Dimensions:''' 108mm × 62mm × 38mm
* '''Weight:''' 140g (without cable)
* '''Cable length:''' 1.2m (4 feet)
* '''Button:''' Single mechanical button
* '''Tracking:''' Opto-mechanical ball system
 
=== Tracking System ===
* '''Ball diameter:''' 19mm (early) or 22mm (later models)
* '''Resolution:''' 100 counts per inch (CPI)
* '''Encoder wheels:''' 36-slot optical
* '''Maximum tracking speed:''' 10 inches/second
* '''Sampling rate:''' 200 Hz mechanical
 
=== Electrical Specifications ===
* '''Interface:''' Apple Desktop Bus (ADB)
* '''Connector:''' 4-pin mini-DIN
* '''Power consumption:''' 50mA typical, 100mA maximum
* '''Operating voltage:''' 4.75V - 5.25V
 
=== ADB Protocol ===
* '''Device address:''' $3 (default)
* '''Handler ID:''' $01 (standard mouse)
* '''Polling rate:''' 100 Hz typical
* '''Data format:''' 2-byte movement packets
 
== Internal Components ==
 
=== Controller Chips ===
Various manufacturers supplied controller ICs:
* '''Logitech:''' Custom ADB controller (Taiwan models)
* '''Mitsumi:''' Proprietary ASIC (Malaysia/Ireland models)
* '''IC Designs:''' Custom controller (some variants)
 
=== Mechanical Components ===
* '''Microswitch:''' Omron D2F series or equivalent
* '''Encoder wheels:''' Injection-molded plastic with 36 slots
* '''LED/Phototransistor pairs:''' Infrared 940nm
* '''Ball:''' Rubber-coated steel (black) or solid rubber (gray)
 
=== Circuit Board Design ===
Two primary PCB configurations existed:
* '''Single board:''' Most common, integrated design
* '''Dual board:''' Separate boards for switch and electronics (China manufacture)
 
== Maintenance & Repair ==
 
=== Disassembly Procedure ===
 
The disassembly process varied by manufacturing variant:
 
'''Taiwan models (two screws):'''
# Locate screw positions under label edges
# Pierce label or carefully peel to access screws
# Remove Phillips screws
# Separate case halves gently
 
'''Later models (single screw):'''
# Find screw under serial number sticker
# Remove single Phillips screw
# Release internal clips carefully
# Separate case halves
 
=== Common Maintenance Tasks ===
 
==== Ball and Roller Cleaning ====
'''Required tools:''' Isopropyl alcohol (90%+), cotton swabs, compressed air
 
'''Procedure:'''
# Rotate ball retainer counterclockwise to remove
# Extract tracking ball
# Clean ball with isopropyl alcohol
# Clean encoder wheels with cotton swab
# Remove debris from encoder slots with compressed air
# Verify roller spring tension
# Reassemble in reverse order
 
==== Microswitch Replacement ====
'''Compatible switches:'''
* Omron D2F-01, D2F-01F, D2F-01F-T
* Panasonic EVQ-P0E07K (light touch)
* Panasonic EVQ-P0D07K (firm touch)
 
'''Replacement procedure:'''
# Disassemble mouse completely
# Desolder failed switch (note orientation)
# Clean PCB pads with flux and wick
# Install new switch maintaining alignment
# Test operation before reassembly
 
==== Cable Repair ====
'''Common failure points:'''
* Cable entry to mouse body
* Strain relief area
* Near connector
 
'''Repair options:'''
* Splice repair at break point
* Complete cable replacement
* Reinforcement with heat shrink tubing
 
=== Troubleshooting Guide ===
 
{| class="wikitable" style="width:80%; text-align:center;"
|+'''Common Issues and Solutions'''
! Symptom !! Likely Cause !! Solution
|-
| Erratic cursor movement || Dirty encoder wheels || Clean wheels and ball thoroughly
|-
| No cursor movement || Broken cable, failed encoder || Test cable continuity, check encoders
|-
| Button doesn't click || Worn microswitch || Replace switch with compatible part
|-
| Intermittent operation || Cable damage, dirty contacts || Check cable, clean connectors
|-
| Double-clicking || Switch bounce || Replace microswitch
|-
| System doesn't recognize || ADB port issue || Test on different port/system
|}
 
=== Preventive Maintenance ===
 
'''Monthly:'''
* Clean ball and check movement
* Inspect cable for damage
 
'''Quarterly:'''
* Deep clean including encoder wheels
* Check button operation
* Clean ADB connector
 
'''Annually:'''
* Full disassembly and cleaning
* Inspect PCB for damage
* Test on known-good system
 
== Modern Retrofits ==
 
=== Optical Sensor Conversion ===
TT Design offers retrofit boards that replace the mechanical ball system with modern optical sensors:
* Model-specific boards for different manufacturing variants
* PixArt optical sensor technology
* Maintains original 100 CPI specification
* USB-C configuration port for adjustment
* Compatible with original ADB protocol
 
=== USB Conversion ===
While the mouse can be used with ADB-to-USB adapters (Griffin iMate, Wombat), internal USB conversion requires significant modification and is generally not recommended due to the availability of purpose-built adapters.
 
== Parts & Specifications ==
 
=== Replacement Parts ===
{| class="wikitable" style="width:70%; text-align:center;"
|+'''Service Parts Reference'''
! Component !! Specification !! Notes
|-
|-
| Tracking ball || 19mm or 22mm diameter || Variant-specific
| Label || smaller printed label; some revisions have embossed text in the plastic instead || large printed label
|-
|-
| Microswitch || Omron D2F series || Universal fit
| Screws underneath || one || two small screws
|-
|-
| Ball retainer || Model-specific || Not interchangeable between variants
| Serial number || starts L; second letter C = China || starts M; second letter I = Ireland, B = Malaysia
|-
|-
| Encoder wheels || 36-slot optical || Donor part required
| Boards inside || two: one for the Omron microswitch, one for the sensors and electronics || one
|-
|-
| Cable assembly || 4-conductor shielded || Some models detachable
| Button || || narrower gap between button and top shell
|}
|}


=== Cleaning Supplies ===
A black version was sold for the [[Macintosh TV]] and the black Macintosh Performa 5420, which also had a black [[Apple Design Keyboard|AppleDesign Keyboard]]. A grey version, M2707, was made in 1993 as an accessory for the PowerBook 100 series.<ref name="dt" />
* Isopropyl alcohol 90%+
* Lint-free cotton swabs
* Compressed air
* Plastic-safe contact cleaner
* Microfiber cloths
 
== Historical Impact ==
 
The Apple Desktop Bus Mouse II's teardrop design proved remarkably influential in the computer industry. The ergonomic shape established design principles that influenced not only subsequent Apple mice but also became widely adopted by other manufacturers. The curved form factor addressed ergonomic concerns while maintaining Apple's design philosophy of simplicity and elegance.
 
Despite criticism for retaining the single-button design when multi-button mice were becoming standard on other platforms, the mouse served successfully throughout the PowerPC transition era. Its five-year production run saw it bundled with systems ranging from the Quadra series through the Power Macintosh G3.
 
== Software Compatibility ==
 
=== System Requirements ===
* '''Minimum:''' System 7.1
* '''Maximum:''' Mac OS 9.2.2
* '''Optimal:''' System 7.5 through Mac OS 8.6
 
=== Control Software ===
* '''Mouse control panel:''' Standard tracking speed adjustment
* '''Third-party utilities:''' SteerMouse, USB Overdrive (with adapters)
* '''Accessibility:''' CloseView, Easy Access
 
== Collector Information ==


=== Authentication ===
== How it tracks ==
* Check serial number format for manufacturing location
Apple describes the mechanism of its ADB mouse: a rubber-coated steel ball turns two capstans, each connected to a slotted interrupter wheel, one for X and one for Y. Two beams of infrared light shine through the slots onto two light detectors, offset so that as the wheel turns they produce two square waves 90° out of phase, the interrupt and quadrature signals; which one leads gives the direction. A microprocessor in the mouse counts the pulses and also acts as the mouse's ADB transceiver.<ref name="g297">Apple Computer, ''Guide to the Macintosh Family Hardware'', 2nd edition (1990), chapter 8, "Apple Standard Mouse", pp. 297-299. Hosted as [[:File:Apple Guide to the Macintosh Family Hardware 2nd Edition 1990.pdf]].</ref>
* Verify label type (printed vs. embossed)
* Confirm ball color matches variant
* Inspect internal PCB configuration


=== Condition Grading ===
== ADB ==
* '''Mint:''' No yellowing, perfect button action
Mice default to ADB address $03, the address for relative-position devices.<ref name="g318">''Guide to the Macintosh Family Hardware'', 2nd ed., Table 8-16, p. 318.</ref> Apple's register 0 format for its ADB mouse is bit 15 button status (0 = down), bits 14-8 Y move counts, bit 7 unused and always 1, and bits 6-0 X move counts, both counts in two's complement. With Device Handler ID $0001, which the mouse has at start-up and after reset, it counts 100 ± 10 per inch of travel; with $0002, 200 ± 10.<ref name="g297" /> A device must answer a Talk command within 260 µs.<ref name="g315">''Guide to the Macintosh Family Hardware'', 2nd ed., Table 8-14, p. 315.</ref> All ADB devices together may draw no more than 500 mA.<ref name="g292">''Guide to the Macintosh Family Hardware'', 2nd ed., p. 292.</ref>
* '''Excellent:''' Minimal yellowing, fully functional
* '''Good:''' Moderate yellowing, normal wear
* '''Fair:''' Significant yellowing, functional issues


=== Market Value ===
== Disassembly ==
* '''Platinum M2706:''' Common, modest value
The Logitech mouse has one screw underneath and the Mitsumi mouse two.<ref name="dt" /> The serial number on the label identifies the maker, so keep the label intact.
* '''Black M2706:''' Rare, commands premium
* '''Gray M2707:''' Uncommon, moderate premium


=== Restoration ===
== Troubleshooting ==
* '''Retrobrighting:''' Effective but may damage texture
=== Erratic or jumpy cursor ===
* '''Case swapping:''' Possible between compatible variants
A jumpy mouse is usually a dirty one.<ref name="til6491">Apple Computer, Tech Info Library article 6491, "How to Clean a Mouse: Instructions Are in the Manual" (reviewed 12 December 1990): a "jumpy" mouse is usually a sign of a dirty mouse; the cleaning procedure is in the computer's owner's guide. [http://absurdengineering.org/library/MASTER%20Tech%20Info%20Library/Peripherals/Mouse%20Devices/ Tech Info Library archive, Mouse Devices]. Retrieved 2026-09-30.</ref>
* '''Internal upgrades:''' Optical conversion available
# Remove the ball and clean it.
# Clean the capstans and the interrupter wheels with a cotton swab and isopropyl alcohol, and blow dust out of the wheel slots.
# Clean the emitters and detectors on both axes.


== Production Statistics ==
If only one axis works, compare it with the working axis: the parts are the same on each.<ref name="g297" />


While exact production numbers remain unpublished, the Apple Desktop Bus Mouse II was manufactured continuously from 1993 to 1998, with estimates suggesting over 6 million units produced across all variants. The Platinum version comprised approximately 95% of production, with black variants accounting for less than 2% of total units manufactured.
=== Button stays down or clicks do not register ===
Apple's procedure for a mouse that seems to stick down: restart; restart with extensions off; shut down, disconnect all ADB cables and devices for at least 10 seconds and reconnect; zap the PRAM; then replace the ADB cables and devices.<ref name="til18560">Apple Computer, Tech Info Library article 18560, "ADB Mouse: Sticking In The Down Position (9/95)". Hosted in [[:File:Apple Tech Info Library ADB keyboard and mouse articles.pdf]], PDF pp. 18-19.</ref> If the fault is in the mouse, the button works an Omron microswitch; on the Logitech mouse the switch has its own board.<ref name="dt" /> Check the switch for continuity when pressed and open when released, and check the button lever for obstruction, before replacing it.


== Legacy ==
=== No response at all ===
# Measure +5 V between pin 3 and pin 4 of the ADB connector. Pin 1 (data) should idle high, pulled up through 470 Ω on the computer's logic board.<ref name="g288">''Guide to the Macintosh Family Hardware'', 2nd ed., Table 8-1, p. 288.</ref>
# A bus held low for 3 ms or more is a Global Reset to every device.<ref name="g315" />
# Check the cable for continuity on all four conductors while flexing it at the strain relief.


The Apple Desktop Bus Mouse II represented the culmination of Apple's ADB-era input device development. Its ergonomic design successfully bridged the gap between Apple's early angular aesthetic and the organic forms that would characterize later products. The mouse's influence extended beyond Apple, with the teardrop shape becoming a de facto standard for mouse design throughout the 1990s.
=== Hot-plugging ===
Do not unplug and reconnect an ADB device while the computer is running. The device reverts to its default address while the computer keeps trying to reach it at the address assigned at startup.<ref name="g287">''Guide to the Macintosh Family Hardware'', 2nd ed., p. 287.</ref> Apple repeats the warning in its troubleshooting articles.<ref name="til18560" />


The transition to USB with the original iMac in 1998 marked the end of the ADB era, but the Desktop Bus Mouse II's design DNA lived on in the controversial "hockey puck" USB Mouse, which attempted to further refine the circular ergonomic concept, though with less success.
== Modern use ==
An ADB-to-USB converter keeps the mouse original; see [[Apple Desktop Bus]] for the protocol.


== See Also ==
== See also ==
* [[Apple Desktop Bus]]
* [[Apple Desktop Bus]]
* [[Apple Desktop Bus Mouse]]
* [[Apple Desktop Bus Mouse]]
* [[Apple USB Mouse]]
* [[Apple Design Keyboard]]
* [[ADB Protocol Specification]]
* [[Retrobrite]]
 
== References ==
<references />


{{Navbox-AppleVintageAccessories}}
{{Navbox-AppleVintageAccessories|state=collapsed}}


[[Category:Apple Vintage Accessories]]
[[Category:Apple Vintage Accessories]]
[[Category:Apple Desktop Bus]]
[[Category:Apple Desktop Bus]]

Latest revision as of 13:29, 30 September 2026

Apple Desktop Bus Mouse II
Apple Desktop Bus Mouse II (M2706)
Manufacturer Apple Computer, Inc. (made by Logitech and Mitsumi)
Type Pointing device
Release date 1993
Discontinued 1998
Interface Apple Desktop Bus
Compatible ADB-equipped Macintosh and Apple II computers
Dimensions 106 × 62 × 33 mm
Weight 0.13 kg
Predecessor Apple Desktop Bus Mouse
Model M2706 (beige, black); M2707 (grey). Order no. M2706LL/A
Power 10 mA maximum
Resolution 200 pulses per inch

The Apple Desktop Bus Mouse II (model M2706) replaced the Apple Desktop Bus Mouse as the standard Macintosh mouse. Deskthority dates it 1993-1998 and gives the FCC ID as BCGM2706.[1] Its shape, rounder, with the ball forward of centre and a larger button across the front, was inspired by the third-generation Microsoft mouse and earned it the nickname "tear-drop mouse".[1]

Apple describes it as a low-power mouse for any Macintosh or Apple II with ADB, with an enlarged button and the ball at the front for precise control, which can plug into an ADB port on the computer or be daisy-chained from another ADB device. Apple's specifications give mechanical tracking with optical shaft encoding at 200 pulses per inch (7.87 per mm), a maximum current of 10 mA, a size of 33 mm high, 62 mm wide and 106 mm deep, and a weight of 0.13 kg. The order number was M2706LL/A.[2]

Variants

[edit | edit source]

There are two makers, identifiable from the underside.[1]

Identifying the maker[1]
Logitech Mitsumi
Label smaller printed label; some revisions have embossed text in the plastic instead large printed label
Screws underneath one two small screws
Serial number starts L; second letter C = China starts M; second letter I = Ireland, B = Malaysia
Boards inside two: one for the Omron microswitch, one for the sensors and electronics one
Button narrower gap between button and top shell

A black version was sold for the Macintosh TV and the black Macintosh Performa 5420, which also had a black AppleDesign Keyboard. A grey version, M2707, was made in 1993 as an accessory for the PowerBook 100 series.[1]

How it tracks

[edit | edit source]

Apple describes the mechanism of its ADB mouse: a rubber-coated steel ball turns two capstans, each connected to a slotted interrupter wheel, one for X and one for Y. Two beams of infrared light shine through the slots onto two light detectors, offset so that as the wheel turns they produce two square waves 90° out of phase, the interrupt and quadrature signals; which one leads gives the direction. A microprocessor in the mouse counts the pulses and also acts as the mouse's ADB transceiver.[3]

ADB

[edit | edit source]

Mice default to ADB address $03, the address for relative-position devices.[4] Apple's register 0 format for its ADB mouse is bit 15 button status (0 = down), bits 14-8 Y move counts, bit 7 unused and always 1, and bits 6-0 X move counts, both counts in two's complement. With Device Handler ID $0001, which the mouse has at start-up and after reset, it counts 100 ± 10 per inch of travel; with $0002, 200 ± 10.[3] A device must answer a Talk command within 260 µs.[5] All ADB devices together may draw no more than 500 mA.[6]

Disassembly

[edit | edit source]

The Logitech mouse has one screw underneath and the Mitsumi mouse two.[1] The serial number on the label identifies the maker, so keep the label intact.

Troubleshooting

[edit | edit source]

Erratic or jumpy cursor

[edit | edit source]

A jumpy mouse is usually a dirty one.[7]

  1. Remove the ball and clean it.
  2. Clean the capstans and the interrupter wheels with a cotton swab and isopropyl alcohol, and blow dust out of the wheel slots.
  3. Clean the emitters and detectors on both axes.

If only one axis works, compare it with the working axis: the parts are the same on each.[3]

Button stays down or clicks do not register

[edit | edit source]

Apple's procedure for a mouse that seems to stick down: restart; restart with extensions off; shut down, disconnect all ADB cables and devices for at least 10 seconds and reconnect; zap the PRAM; then replace the ADB cables and devices.[8] If the fault is in the mouse, the button works an Omron microswitch; on the Logitech mouse the switch has its own board.[1] Check the switch for continuity when pressed and open when released, and check the button lever for obstruction, before replacing it.

No response at all

[edit | edit source]
  1. Measure +5 V between pin 3 and pin 4 of the ADB connector. Pin 1 (data) should idle high, pulled up through 470 Ω on the computer's logic board.[9]
  2. A bus held low for 3 ms or more is a Global Reset to every device.[5]
  3. Check the cable for continuity on all four conductors while flexing it at the strain relief.

Hot-plugging

[edit | edit source]

Do not unplug and reconnect an ADB device while the computer is running. The device reverts to its default address while the computer keeps trying to reach it at the address assigned at startup.[10] Apple repeats the warning in its troubleshooting articles.[8]

Modern use

[edit | edit source]

An ADB-to-USB converter keeps the mouse original; see Apple Desktop Bus for the protocol.

See also

[edit | edit source]

References

[edit | edit source]
  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Deskthority wiki, "Apple Desktop Bus Mouse II": part numbers M2706 (beige, black) and M2707 (grey), FCC IDs BCGM2706 and BCGM2707, made by Logitech and Mitsumi, one button, opto-mechanical, 1993-1998; Logitech and Mitsumi variants; black and grey versions; photographs. Community wiki, secondary source. Retrieved 2026-09-30.
  2. ↑ Apple Computer, Tech Info Library article 11227, "Apple Desktop Bus Mouse II: Description and Specifications", created 6 January 1993. Hosted in File:Apple Tech Info Library ADB keyboard and mouse articles.pdf, PDF pp. 16-17.
  3. ↑ 3.0 3.1 3.2 Apple Computer, Guide to the Macintosh Family Hardware, 2nd edition (1990), chapter 8, "Apple Standard Mouse", pp. 297-299. Hosted as File:Apple Guide to the Macintosh Family Hardware 2nd Edition 1990.pdf.
  4. ↑ Guide to the Macintosh Family Hardware, 2nd ed., Table 8-16, p. 318.
  5. ↑ 5.0 5.1 Guide to the Macintosh Family Hardware, 2nd ed., Table 8-14, p. 315.
  6. ↑ Guide to the Macintosh Family Hardware, 2nd ed., p. 292.
  7. ↑ Apple Computer, Tech Info Library article 6491, "How to Clean a Mouse: Instructions Are in the Manual" (reviewed 12 December 1990): a "jumpy" mouse is usually a sign of a dirty mouse; the cleaning procedure is in the computer's owner's guide. Tech Info Library archive, Mouse Devices. Retrieved 2026-09-30.
  8. ↑ 8.0 8.1 Apple Computer, Tech Info Library article 18560, "ADB Mouse: Sticking In The Down Position (9/95)". Hosted in File:Apple Tech Info Library ADB keyboard and mouse articles.pdf, PDF pp. 18-19.
  9. ↑ Guide to the Macintosh Family Hardware, 2nd ed., Table 8-1, p. 288.
  10. ↑ Guide to the Macintosh Family Hardware, 2nd ed., p. 287.


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