Apple Apple Adjustable Keyboard vs Apple Apple Extended Keyboard II

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Apple Adjustable Keyboard compared with Apple Extended Keyboard II

	AppleApple Adjustable Keyboard	AppleApple Extended Keyboard II
Overview
Released
Released	February 1993	1990
Typing
Layout
Layout	Full size	Full size
Switches
Switches	Mechanical	Mechanical
Key travel
Key travel	3.5 mm	–
Backlight
Backlight	None	None
Keys labelled for
Keys labelled for	Mac	Mac
Touch ID
Touch ID	No	No
Switches
Switches	Alps SKFS mechanical switches on the main typing keys, identified by owners on Deskthority; Apple specifies 3.5 mm key travel.	Mechanical switches; Deskthority documents Alps and Mitsumi switch variants across M0312 and M3501 units.
Layouts
Layouts	Apple's ANSI set totals 111 keys across the split main keyboard and separate extended keypad; an ISO version has 112.	Apple's M0312 specification lists 105 keys, including an 18-key numeric pad, 15 function keys, six editing keys and inverted-T arrows.
Special keys
Special keys	The separate keypad holds 15 function keys, six editing keys, four inverted-T arrows and an 18-key numeric pad; main keyboard has volume, mute and record keys.	F1–F15 function keys with a supplied labelling overlay; lock indicators for Caps, Num and Scroll Lock.
Connections and battery
Connects by
Connects by	Cable	Cable
Power
Power	Cable	Cable
Receiver
Receiver	Apple Desktop Bus connection; Apple's order list includes a 1 m coiled ADB cable and a 340 mm jumper cable for the keypad.	Detachable 1 m Apple Desktop Bus cable supplied; the keyboard has ADB ports for connection to compatible Apple computers.
Works with
Works with	Apple's announcement says it works with Macintosh computers running System Software 6.0.7 or later and an ADB port.	Any Apple personal computer with an Apple Desktop Bus interface, according to Apple's specification.
Design
Width × depth × height
Width × depth × height	–	475 × 195 × 41 mm
Weight
Weight	1700 g	–
Materials
Materials	Split beige plastic enclosure with detachable palm rests and feet; the main keyboard opens from 0° to 30°.	Beige plastic enclosure; the rear foot raises the stated typing angle from 6° to 14°.
Colours
Colours	Beige.	Beige.
In the box
In the box	Main keyboard, three palm rests, extended keypad, template, ADB cables, installer disk and manual in Apple's order list.	Keyboard, 1 m ADB cable, function-key overlay, owner's guide and warranty statement in Apple's M0312 packing list.