Apple Extended Keyboard

Apple Extended Keyboard
Apple Extended Keyboard M0115, US layout
Manufacturer	Apple Computer, Inc.
Type	Computer keyboard
Release date	1987 (with the Macintosh II and Macintosh SE)
Discontinued	1990
Interface	Apple Desktop Bus
Compatible	ADB Macintosh models
Successor	Apple Extended Keyboard II
Model	M0115, M0115B, M0115D, M0115J
Part number	661-0384 (service exchange)

For the Apple Keyboard M0116, see Apple Keyboard (M0116).

The Apple Extended Keyboard (model M0115) is Apple's first full-size keyboard, with a row of function keys and an inverted-T cursor cluster. It was introduced in 1987 with the Macintosh II and Macintosh SE, which were sold without a keyboard, so buyers chose between it and the smaller Apple Keyboard. It was made until 1990 and succeeded by the Apple Extended Keyboard II.

Apple's service manual describes it as containing its own microcontroller, like the Apple Keyboard, and communicating over the Apple Desktop Bus. Both keyboards connect to the ADB port on the Macintosh II.

Construction

Deskthority gives the dimensions as 19.13 × 7.4 × 2.25 inches (486 × 190 × 57 mm) and the weight as 3.63 lb (1.65 kg), citing Apple's July 1987 product brochure. The case and space bar appear to be ABS and the other keycaps PBT, with dye-sublimated legends in italic type in Apple's own keycap profile. The keyboard has no adjustment for its angle on the desk. Two bidirectional ADB ports sit under the top left and right corners. Deskthority reports that the case screws can be replaced with #6 3/8 in Phillips pan-head screws of about 1.3 mm thread pitch.

Switches

The main keys use Alps SKCM Orange or SKCM Salmon switches, both tactile, and Caps Lock uses an Alps SKCL Lock latching switch. Deskthority dates SKCM Orange to about 1987-1991 and lists it as the switch in most M0115s; it is found with and without the Alps logo on top. Two different space-bar stabiliser arrangements have been seen.

Variants

M0115 variants

Model	Difference
M0115	Base model, 105-key ANSI layout
M0115B	United Kingdom: the 3 key carries £ instead of #; rear label "Assembled in Ireland"
M0115D	German: function keys with symbols only
M0115J	Japanese legends

The FCC ID is BCG5K5M0115.

ADB behaviour

The ADB connector carries the data line on pin 1 (open collector, pulled up to +5 V through 470 ohms on the computer's logic board), POWER.ON on pin 2, +5 V on pin 3 and ground on pin 4. On the Macintosh II family a key on the ADB keyboard momentarily grounds pin 2 to switch the computer on; on other models pin 2 is not connected. All ADB devices together must draw no more than 500 mA; cables should be no longer than 5 m with no more than 100 pF per metre, and Apple recommends no more than three devices daisy-chained on one port.

Twelve function keys (F1-F12) have no default definition; nine other function keys do.

Register 0 holds up to two key transitions at a time: bit 15 is the status of the first key (0 = down) and bits 14-8 its key code, bit 7 the status of the second key and bits 6-0 its code. Register 2 holds the modifier keys (Delete bit 14, Caps Lock 13, Reset 12, Control 11, Shift 10, Option 9, Command 8), Num Lock/Clear (bit 7), Scroll Lock (bit 6) and the three LEDs (LED 3 Scroll Lock bit 2, LED 2 Caps Lock bit 1, LED 1 Num Lock bit 0). A zero means a key is down or an LED is on, and the host sets the LED bits with a Listen Register 2 command.

Changing the Device Handler ID in register 3 from $0002 to $0003, with a Listen Register 3 command, makes the keyboard send separate codes for the right-hand Option and Control keys; Apple's Table 8-9 also marks the right Shift key as affected.

Service

Apple serviced the keyboard as a complete exchange unit, 661-0384. Apple's instruction is not to remove the keyboard mechanism when exchanging the keyboard; send the whole unit without the cable, and remove the mechanism only to replace a keyswitch.

To open it, following Apple's procedure for its ADB keyboards:

1. Disconnect the keyboard from the computer and remove the cable.
2. Work on a grounded workbench pad with a wrist strap.
3. Remove the three Phillips screws from the back and lift off the top cover.
4. Note how the small breakaway boards carrying the ADB connectors fit into the upper corners of the bottom case, then lift the mechanical assembly out.
5. To reassemble, place the assembly in the bottom case with the breakaway boards upright in their slots, engage the top cover's teeth on the front edge of the bottom case and its guide posts in the holes, then turn the keyboard over and fit the three screws.

Apple Extended Keyboard service parts (Macintosh SE parts list, Figure 10)

Part number	Description
661-0384	Apple Extended Keyboard
815-1018	Top case
658-7010	Key cap set
076-0209	Keyswitch set
815-1019	Bottom case
970-1263	Alps locking keyswitch
590-0361	Cable, keyboard

The Caps Lock position needs the latching Alps SKCL Lock switch; Apple listed it as the Alps locking keyswitch, 970-1263.

For a keyboard that does nothing, check +5 V between pins 3 and 4 of the computer's ADB port and try the keyboard on another ADB machine and with another cable. The lock LEDs are set by the host through Listen Register 2, so an LED that never lights may be a software or host matter.

Related pages

• Apple Extended Keyboard II
• Apple Keyboard (M0116)
• Apple Desktop Bus
• Macintosh II
• Apple ADB Keyboards Technical Procedures (Macintosh SE)