@@ Line 27: / Line 27: @@
 * '''M0142''' – Consolidated model number used from 1988-1993
-Despite different model numbers, all variants were functionally identical. Manufacturing occurred in Taiwan (early models), Ireland, and later Singapore facilities.
+Despite different model numbers, all variants were functionally identical. Manufacturing occurred in Taiwan (early models), Ireland, USA, and later Singapore and Malaysia facilities.
 == Design & Construction ==
@@ Line 37: / Line 37: @@
 The mouse utilized mechanical ball tracking with the following key components:
-* '''Tracking mechanism:''' 19mm rubber-coated steel ball
+* '''Tracking mechanism:''' 19mm rubber-coated steel ball (black on early models, gray on later)
 * '''Optical encoders:''' Two perpendicular slotted wheels with infrared LED/phototransistor pairs
 * '''Controller chip:''' Various manufacturers including:
 ** Mitsumi custom ADB controller
-** Logitech 42c60p5625
+** Logitech 42c60p5625 (Taiwan models)
 ** IC Designs custom ASIC
+** Alps 820-0232 (USA models)
 * '''Microswitch:''' Omron D2F series rated for 1 million clicks
 * '''Circuit board:''' Single-sided PCB with through-hole components
 === Manufacturing Variations ===
-Two primary internal designs existed:
+Five primary internal designs existed across production facilities:
-'''Taiwan/Singapore manufacture:'''
+'''Taiwan manufacture (Logitech):'''
-* Single consolidated PCB
+* Model A9M0331 with black ball
-* Integrated controller chip
+* Beige PCB top, green bottom
-* Cost-reduced component count
+* Marked "ADB Mouse by Logitech Rev C2"
+* White ball cage
+* Part numbers: 400115-400118
-'''Ireland manufacture:'''
+'''Taiwan manufacture (Logitech G5431):'''
-* Dual PCB design (main board + switch board)
+* Green PCB marked "Logitech AT Rev B"
-* Discrete logic implementation
+* P/N 200048-00
-* Higher component quality
+* Black ball cage
+* Part numbers: 400234-400235
+'''USA manufacture (Alps):'''
+* Brown PCB stamped 820-0232
+* Gray 25mm ball
+* Round retainer with V-notch
+* Integrated ball cage
+* Part numbers: 815-1090 to 815-1092
+'''USA manufacture (Unknown):'''
+* Green PCB stamped 820-0146
+* Gray 25mm ball
+* Ribbed retainer with 3 tabs
+* White ball cage
+* Steel rollers
+'''Malaysia manufacture (Mitsumi):'''
+* Brown PCB marked Mitsumi
+* Gray 25mm ball
+* Black ball cage
+* Two-screw PCB mounting
+* Part numbers: 64-1259 to 64-1262
 == Technical Specifications ==
@@ Line 85: / Line 110: @@
 * '''Default address:''' $3 (reassignable via bus enumeration)
 * '''Polling rate:''' ~100 Hz typical
+=== Protocol Timing Details ===
+Each ADB transaction follows this sequence:
+# '''Attention signal:''' Host pulls bus low for 800μs
+# '''Sync signal:''' Bus high for 70μs
+# '''Command byte:''' 8 bits (4-bit address, 2-bit command, 2-bit register)
+# '''Stop bit:''' Logic 0 with optional 300μs service request window
+# '''Stop-to-start time (Tlt):''' 140-260μs high period
 === Device Registers ===
@@ Line 90: / Line 123: @@
 * '''Register 0:''' Mouse movement data (2 bytes)
-** Byte 0: Button state (bit 7) + X movement delta
+** Byte 0: Button state (bit 7) + X movement delta (-127 to +127)
-** Byte 1: Button state (bit 7) + Y movement delta
+** Byte 1: Button state (bit 7) + Y movement delta (-127 to +127)
-* '''Register 1:''' Reserved (unused)
+* '''Register 1:''' Reserved (unused, later used for extended protocol)
 * '''Register 2:''' Reserved (unused)
 * '''Register 3:''' Device identification and address
 ** Default handler ID: $01 (standard mouse)
+** Bits 11-8: Device address (default $3)
+** Bits 7-0: Handler ID
 === Tracking Performance ===
 * '''Resolution:''' 100 counts per inch (CPI)
 * '''Maximum tracking speed:''' 10 inches/second
 * '''Sampling rate:''' Mechanical encoder dependent (~200 Hz)
+* '''Encoder wheel slots:''' 36 per wheel (10° resolution)
 == ADB System Architecture ==
@@ Line 113: / Line 150: @@
 The mouse typically operated at address $3, with the keyboard at address $2. During system initialization, the ADB Manager would enumerate devices and resolve any address conflicts through a sophisticated random address generation scheme.
+== Expanded Troubleshooting & Repair ==
+=== Diagnostic Procedures ===
+==== Erratic Cursor Movement ====
+'''Symptoms:''' Jumpy, inconsistent, or drifting cursor movement
+'''Root Causes & Solutions:'''
+# '''Dirty encoder wheels''' (Most common)
+#* Remove ball and inspect encoder wheels for dust/debris
+#* Clean wheels with cotton swab and 90%+ isopropyl alcohol
+#* Use compressed air to clear encoder slots
+#* Ensure LED/phototransistor pairs are clean
+# '''Worn ball surface'''
+#* Check for flat spots or uneven wear
+#* Clean ball with isopropyl alcohol
+#* Replace if severely worn (19mm rubber-coated steel ball)
+# '''Encoder wheel damage'''
+#* Inspect for broken or bent encoder wheel teeth
+#* Check encoder shaft for excessive play
+#* Replacement requires donor mouse or compatible encoder assembly
+# '''Controller chip issues'''
+#* Test with known-good ADB system
+#* Check for proper +5V supply at controller
+#* Controller replacement requires exact matching part
+==== Button Failures ====
+'''Symptoms:''' No click, stuck button, double-clicking, intermittent response
+'''Microswitch Testing:'''
+# Measure resistance across switch terminals (should be <1Ω when pressed)
+# Test for proper tactile feedback and audible click
+# Check for mechanical obstruction in button mechanism
+'''Replacement Procedure:'''
+# Compatible switches: Omron D2F-01, D2F-01F, D2F-01F-T
+# Specifications: SPDT, 10mA minimum current rating
+# Desolder old switch carefully to avoid PCB damage
+# Install new switch ensuring proper alignment with button actuator
+==== Complete Failure ====
+'''Symptoms:''' No response, system doesn't recognize mouse
+'''Systematic Diagnosis:'''
+# '''Power verification'''
+#* Measure +5V at pin 3 of ADB connector
+#* Check ground continuity at pin 4
+#* Typical current draw: 50-80mA during operation
+# '''Cable testing'''
+#* Check for breaks at strain relief points
+#* Test continuity of all four wires end-to-end
+#* Common failure point: cable entry to mouse body
+# '''ADB communication test'''
+#* Use oscilloscope to verify data signal on pin 1
+#* Check for 800μs attention pulse from host
+#* Verify mouse responds with register data when polled
+# '''Controller diagnostics'''
+#* Check crystal oscillator (if present) for proper frequency
+#* Verify controller power pins (+5V and ground)
+#* Test for shorts on data lines
+=== Component-Level Repairs ===
+==== Circuit Board Repair ====
+'''Common PCB Issues:'''
+* Cracked traces near cable entry
+* Cold solder joints on through-hole components
+* Corrosion from liquid spills
+'''Repair Techniques:'''
+* Use 30AWG wire for trace repairs
+* Reflow all solder joints with flux
+* Clean corrosion with white vinegar, then IPA
+* Apply conformal coating after repairs
+==== Encoder Maintenance ====
+'''Cleaning Procedure:'''
+# Remove encoder wheels from shafts
+# Clean wheel slots with soft brush
+# Clean optical pairs with lens cleaning solution
+# Verify proper spring tension on roller shafts
+# Apply small amount of silicone lubricant to shafts
+'''Alignment Check:'''
+* Encoder wheels must be perpendicular
+* LED must align with center of phototransistor
+* Wheel must pass cleanly through optical gap
+* No rubbing or binding during rotation
+==== Cable Replacement ====
+'''Required Skills:''' Soldering, cable preparation
+'''Procedure:'''
+# Source replacement 4-conductor cable with shield
+# Match original wire colors if possible:
+#* Pin 1 (Data): Usually white or yellow
+#* Pin 2 (PSW): Usually black or brown
+#* Pin 3 (+5V): Usually red
+#* Pin 4 (Ground): Usually green or shield
+# Maintain original cable length (approximately 1.2m)
+# Use heat shrink tubing at stress points
+=== Test Equipment & Tools ===
+'''Essential Tools:'''
+* Digital multimeter with continuity test
+* Precision screwdriver set (Phillips #0, #1)
+* Desoldering pump or wick
+* Temperature-controlled soldering iron (15-25W)
+* 90%+ isopropyl alcohol
+* Cotton swabs and lint-free cloths
+* Compressed air
+'''Advanced Diagnostics:'''
+* Oscilloscope (10MHz minimum bandwidth)
+* Logic analyzer for protocol analysis
+* ADB diagnostic software (TechTool, ADB Parser)
+* Frequency counter for timing verification
+=== Preventive Maintenance Schedule ===
+'''Monthly:'''
+* External cleaning of mouse surface
+* Check cable for damage
+'''Quarterly:'''
+* Remove and clean ball
+* Inspect encoder wheels
+* Clean mouse pad surface
+'''Annually:'''
+* Disassemble and deep clean
+* Check microswitch operation
+* Inspect PCB for damage
+* Test on known-good system
 == Common Modifications ==
 === Two-Button Conversion ===
-Enthusiasts discovered that most ADB controller chips included support for a second button, though Apple never implemented it. Common modifications included:
+Most ADB controller chips included support for a second button, though Apple never implemented it. Common modifications included:
-* Identifying the unused second button pin on the controller chip
+* Identifying the unused second button pin on the controller chip (varies by manufacturer)
 * Adding a tactile switch connected to this pin and ground
 * Modifying the case to accommodate the additional button
-* Software support via third-party control panels
+* Software support via third-party control panels (ClickChange, MouseWorks)
 === Optical Sensor Upgrade ===
 Modern retrofit kits allow replacement of the mechanical ball system with optical tracking:
-* TT Design's ADB Optical Mouse Retro Board
+* TT Design's ADB Optical Mouse Retro Board (RP2040-based)
-* Uses RP2040 microcontroller with modern optical sensor
+* Uses modern optical sensor (PixArt or similar)
 * Maintains original 100 CPI default with adjustable settings
 * Compatible with original ADB protocol and timing
+* Requires desoldering original PCB and installing retrofit board
+=== Performance Enhancements ===
+* '''Teflon pad replacement:''' Replace worn pads with PTFE dots
+* '''Ball upgrade:''' Replace with precision phenolic resin ball
+* '''Spring tension adjustment:''' Optimize encoder wheel pressure
+* '''Shielding improvements:''' Add EMI shielding to reduce interference
 == Maintenance & Repair ==
@@ Line 137: / Line 323: @@
 Regular maintenance was essential for reliable operation:
-# Remove the retaining ring on the bottom of the mouse
+# Remove the retaining ring on the bottom of the mouse (rotate counterclockwise)
 # Extract the tracking ball
 # Clean ball with isopropyl alcohol
 # Remove lint and debris from encoder wheels using compressed air
 # Clean encoder wheel surfaces with cotton swab and IPA
+# Clean mouse pad contacts if present
 # Reassemble in reverse order
 === Common Failures ===
-* '''Erratic cursor movement:''' Dirty encoder wheels or worn ball
+* '''Erratic cursor movement:''' Dirty encoder wheels or worn ball (80% of issues)
 * '''Button failure:''' Worn microswitch (replaceable with D2F series)
 * '''Intermittent connection:''' Broken wires at cable strain relief
@@ Line 151: / Line 338: @@
 === ADB Port Safety ===
-The ADB port lacked proper protection against hot-swapping on most systems. Connecting or disconnecting devices while powered could blow the ADB fuse on the motherboard, requiring professional repair or fuse replacement.
+The ADB port lacked proper protection against hot-swapping on most systems. Connecting or disconnecting devices while powered could blow the ADB fuse on the motherboard (typically 1.1A polyfuse), requiring professional repair or fuse replacement.
 == Historical Context ==
@@ Line 169: / Line 356: @@
 * '''Apple IIGS:''' GS/OS with built-in mouse driver
 * '''Macintosh:''' System 3.2 through Mac OS 9.2.2
-* '''Third-party:''' MouseKeys, QuicKeys, and other enhancement utilities
+* '''NeXT:''' Compatible with ADB-equipped NeXT systems
+* '''Third-party:''' MouseKeys, QuicKeys, SteerMouse, USB Overdrive (with adapters)
 === Control Panels ===
 * '''Mouse control panel:''' Tracking speed adjustment (System 6.0+)
-* '''CloseView::''' Cursor size and visibility options
+* '''CloseView:''' Cursor size and visibility options
 * '''Third-party tools:''' Added acceleration curves and button customization
+== Parts & Specifications ==
+=== Replacement Components ===
+{| class="wikitable" style="width:70%; text-align:center;"
+|+'''Common Replacement Parts'''
+! Component !! Specification !! Modern Equivalent
+|-
+| Microswitch || Omron D2F series || D2F-01F-T, D2FC-F-7N
+|-
+| Ball || 19mm rubber-coated steel || 3/4" precision bearing ball
+|-
+| Encoder wheels || 36-slot optical || Custom part (donor required)
+|-
+| LED || IR 940nm || Standard 3mm IR LED
+|-
+| Phototransistor || IR sensitive || Standard 3mm phototransistor
+|-
+| Controller IC || Various proprietary || No direct replacement
+|}
+=== Electrical Specifications ===
+* '''Operating voltage:''' 4.75V - 5.25V
+* '''Current consumption:''' 50mA typical, 100mA maximum
+* '''Data rate:''' 10-50 kbit/s typical
+* '''Temperature range:''' 10°C - 40°C operating
+* '''Humidity:''' 20% - 80% non-condensing
 == Collector Information ==
@@ Line 181: / Line 396: @@
 * '''Early models (1986-1988):''' Larger printed label with two screws
 * '''Later models (1988-1993):''' Smaller label with single center screw
-* '''Serial number format::''' First letter indicates year, second indicates country
+* '''Serial number format:''' First letter indicates year, second indicates manufacturing location
 === Condition Assessment ===
-* '''Case yellowing:''' Common due to brominated flame retardants or UV light
+* '''Case yellowing:''' Common due to brominated flame retardants in ABS plastic
 * '''Cable integrity:''' Check for cracks at strain relief points
 * '''Mechanical wear:''' Test ball retention and encoder wheel movement
@@ Line 190: / Line 405: @@
 === Modern Usage ===
-* '''ADB-to-USB converters:''' Griffin iMate (discontinued), Wombat adapter
+* '''ADB-to-USB converters:''' Griffin iMate (discontinued), Wombat adapter, Belkin F5U118
 * '''Retrobrighting:''' Possible but risky for painted Platinum plastic
 * '''Replacement parts:''' NOS balls and microswitches still available
+* '''Modern retrofits:''' Optical sensor upgrades maintain vintage appearance
 == Related Accessories ==
@@ Line 199: / Line 415: @@
 * [[Macintosh Mouse Pad]]
 * [[ADB Extension Cable]]
+== See Also ==
+* [[Apple Desktop Bus]]
+* [[Apple Desktop Bus Protocol Specification]]
+* [[ADB Device Programming]]
 [[Category:Apple Vintage Accessories]]
 [[Category:Apple Desktop Bus]]

Apple Desktop Bus Mouse: Difference between revisions

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