Apple Numeric Keypad IIe: Difference between revisions
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Revision as of 13:02, 9 February 2026
| Apple Numeric Keypad IIe | |
|---|---|
| Apple Numeric Keypad IIe (Model A2M2003) | |
| Manufacturer | Apple Computer, Inc. |
| Type | Numeric keypad |
| Discontinued | 1987 |
| Price | US$75 |
| Interface | DB-15 |
| Compatible | Apple IIe |
| Dimensions | ~165 mm × 105 mm × 40 mm |
| Weight | ~250 g |
| Predecessor | Apple Numeric Keypad II |
| Successor | Built-in keypad (Platinum IIe) |
| Model | A2M2003 |
The Apple Numeric Keypad IIe (model A2M2003) was Apple's first standalone external keyboard accessory, released in 1983 for the Apple IIe. It provided numeric entry, cursor control, and mathematical functions in a compact unit. The keypad used Alps mechanical switches in early production and Alps integrated dome switches in later units.
Design
Physical Construction
The keypad uses a rounded ABS plastic clamshell case:
- Fixed 7-degree typing angle
- Four screws on bottom (two exposed, two under rubber feet)
- Apple logo in lower-left corner
- DB-15 connector cable (fixed, not detachable)
Case dimensions: approximately 165 mm × 105 mm × 40 mm.
Layout
The keypad features 24 keys arranged in a 6 × 4 grid:
Left column (navigation):
- Escape
- Left arrow
- Right arrow
- Space (1u)
Center cluster (numeric):
- Standard 0-9 layout
- 1.5u zero key at bottom left
- Comma
- Decimal point
Right columns (functions):
- Open parenthesis, Close parenthesis
- Minus, Divided by
- Plus, Multiply
- Return, Print (displayed as "?")
The Print key (?) was shorthand for the AppleSoft BASIC PRINT statement.
Switches
Two switch variants exist:
Early production (1982):
- Alps SKCC Tall Black mechanical switches
- Double-shot PBT keycaps
- Larger capitalized white legends
Later production (1983+):
- Alps black cross mount integrated dome switches
- Dye-sublimated PBT keycaps
- Smaller dark legends
Per Apple switch part numbers, the official specification called for SMK short stem switches (presumably SMK J-M0404 series), but actual units examined contain Alps switches.
Connection
The Numeric Keypad IIe connects via a DB-15 connector to an internal header on the Apple IIe motherboard. A custom cable routes from the DB-15 to an 11-pin female header inside the computer.
Pinout
The keyboard uses an X/Y matrix configuration:
- 11 pins for matrix scanning
- Ground connections
- No active electronics in the keypad
Detailed pinout information is documented in the Apple II wiki and QMK firmware repository.
Specifications
| Parameter | Value |
|---|---|
| Model number | A2M2003 |
| Keys | 24 |
| Layout | 6 × 4 grid |
| Switches | Alps SKCC (early) / Alps integrated dome (later) |
| Keycaps | PBT (double-shot or dye-sublimated) |
| Interface | DB-15 to 11-pin header |
| Case material | ABS plastic |
| Case color | Beige (Apple IIe matching) |
| Typing angle | 7 degrees (fixed) |
Packaging
The keypad shipped in a white box with gray graphics containing:
- Numeric Keypad IIe unit
- Operations Manual
- Service wrench
- VisiCalc compatibility notice
USB Conversion
The Numeric Keypad IIe can be converted for use with modern computers using QMK firmware:
Required hardware:
- ATmega32U4 microcontroller (Arduino Micro, Pro Micro, Elite-C, Teensy 2.0)
- DB-15 breakout board
- Jumper wires
Firmware: QMK includes a converter profile at `/keyboards/converter/numeric_keypad_IIe` with complete pinout documentation and default keymap.
The conversion preserves the original keyboard while adding USB HID capability.
Maintenance
Disassembly
- Remove two exposed screws from rear bottom
- Peel back rubber feet to access front screws
- Remove front screws
- Separate case halves carefully
Switch Cleaning
Mechanical (SKCC) version:
- Open switch housing (4 tabs)
- Clean contacts with isopropyl alcohol
- Check spring condition
- Reassemble
Dome version:
- Clean around domes with compressed air
- Do not remove dome sheet
- Clean keycap stems
Keycap Removal
Use a wire keycap puller. The Alps mount is compatible with standard Alps pullers. Avoid twisting during removal.
Collecting
Switch Variants
The mechanical SKCC version is more sought after by keyboard enthusiasts:
| Version | Switches | Keycaps | Rarity |
|---|---|---|---|
| Early (1982) | Alps SKCC Tall Black | Double-shot PBT | Less common |
| Later (1983+) | Alps integrated dome | Dye-sub PBT | More common |
Condition Assessment
- Mint: Complete with box and documentation
- Excellent: Clean, functional, original keycaps
- Good: Functional, minor yellowing or wear
- Fair: Functional but significant wear
- Poor: Non-functional, missing keycaps, or broken case
Identification
- Check keycap legend style (larger = mechanical version)
- Remove a keycap to verify switch type
- Early production has SKCC switches with visible spring
Legacy
The Numeric Keypad IIe was Apple's first standalone external keyboard product. When the Platinum Apple IIe launched in 1987, it incorporated a built-in numeric keypad, eliminating the need for the external accessory.
The keypad's layout influenced the later Macintosh Numeric Keypad (M0120), though that product used different switches and a telephone-cord connector.
See Also
References
- Neatnik.net — Numeric Keypad IIe documentation
- Deskthority wiki — Apple Numeric Keypad IIe
- QMK Firmware repository — converter documentation
- Geekhack forums — user photos and analysis