Apple Numeric Keypad IIe

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.

References

Neatnik.net — Numeric Keypad IIe documentation
Deskthority wiki — Apple Numeric Keypad IIe
QMK Firmware repository — converter documentation
Geekhack forums — user photos and analysis