Apple Numeric Keypad II
| Apple Numeric Keypad II | |
|---|---|
 |
|
| Apple Numeric Keypad II with its interface board and ribbon cable | |
| Manufacturer | Apple Computer, Inc. |
| Type | Numeric keypad |
| Price | US$139.95 (February 1984 price list) |
| Interface | Interface board between the keyboard ribbon cable and the logic board keyboard connector (A7) |
| Compatible | Apple II, Apple II Plus |
| Predecessor | The Keyboard Company Numeric Keypad (K620-0002 / K680-0002) |
| Successor | Apple Numeric Keypad IIe |
| Model | A2M0056 |
| Part number | 661-0314 (service assembly with cable) |
The Apple Numeric Keypad II (model A2M0056) is an external numeric keypad for the Apple II and Apple II Plus, whose keyboards have no numeric pad. Apple's February 1984 dealer price list gives its suggested retail price as US$139.95.[1] It is a revised, Apple-branded version of The Keyboard Company's numeric keypad for the Apple II.[2]
The Keyboard Company keypad
[edit | edit source]The Keyboard Company (TKC) mass-produced Apple II keyboards, and its numeric keypad was its first peripheral for Apple computers. Apple later acquired the company, which became Apple's Accessory Products Division.[2]
| Item | Value |
|---|---|
| Model | K680-0002, with an earlier K620-0002 revision |
| FCC ID | BTW8XENUMERICPAD, 21 January 1982 |
| Introduced | 1981 |
| Price | US$120.00 (BYTE advertisement, November 1981) |
| Switches | Alps integrated dome, black sliders |
| Keycaps | Thick double-shot |
Connection
[edit | edit source]The Apple II and II Plus have no keypad connector. The Keypad II uses an interface board that sits between the keyboard and the logic board: the keyboard's ribbon cable plugs into J1 on the interface board, the interface board's P2 plugs into the keyboard connector at A7 on the Apple logic board, and the keypad's shielded cable plugs into P3, with pin 1 at the purple wire. Apple's Figure A shows the pin 1 alignment for each of the three connections.[3]
Layout and switches
[edit | edit source]Apple's Figure D shows the layout: Escape, left arrow, right arrow and Space in the left column; 7 to 9, 4 to 6, 1 to 3, then 0, 00 and a decimal point in the centre; brackets, minus, divide, plus, multiply, Return and Print on the right.[3]
Apple's keyswitch identification chart gives the Keypad II switch as the SMK short-stem keyswitch 705-0075, alongside an earlier switch it marks obsolete, and gives the keypad's service number as 661-95092 (obsolete).[3] The TKC keypad it was developed from uses Alps integrated dome switches.[2]
| Part number | Description |
|---|---|
| 661-0314 | Numeric keypad assembly, II, with cable |
| 658-0005 | Interface board (PCB assembly, interface keypad II) |
| 590-0119 | Cable, numeric keypad II |
| 658-7008 | Keycap set, numeric keypad II |
| 705-0075 | SMK short-stem keyswitch |
Troubleshooting and repair
[edit | edit source]Apple's procedure isolates the fault by swapping modules in order: confirm the fault with the keyboard test on the Dealer Diagnostic diskette, then swap the interface board, then the cable, then the keypad assembly, testing after each swap and refitting the original part if the swap does not cure it. Switch the Apple II off and unplug the power cord before swapping anything.[3]
Inside the keypad, the cable plugs into the keypad assembly with the grooves of its connector facing up, and a ground wire is soldered to the upper left of the keypad board. The case top comes off after the four screws are removed, two of them under the rubber feet. When reassembling, lay the cable so that it points down as it leaves the case and keep all the wires inside the bottom half so none is pinched.[3]
Documentation
[edit | edit source]- Apple Numeric Keypad Technical Procedures (Apple II/IIe): connection figure, troubleshooting, disassembly, parts list and keyswitch identification.
See also
[edit | edit source]References
[edit | edit source]- ↑ Apple Computer, dealer price list dated 15 February 1984, "Apple // Miscellaneous Accessories", page 3 of 8 (PDF p. 5): A2M0056 Numeric Keypad II+, US$139.95; A2M2003 Numeric Keypad //e, US$99.00. Hosted as File:Apple Dealer Price Lists February 1984.pdf.
- ↑ 2.0 2.1 2.2 2.3 "The Keyboard Company Numeric Keypad", Deskthority wiki (community wiki, a secondary source, with photographs): model K680-0002 and an earlier K620-0002; FCC ID BTW8XENUMERICPAD dated 21 January 1982; Alps integrated dome switches with black sliders; thick double-shot keycaps; introduced 1981 at US$120.00 (BYTE advertisement, November 1981); a week 18, 1982 chip date code; TKC as Apple's later Accessory Products Division; "The Apple Numeric Keypad II is a revised model of this keypad as an official, Apple-branded product".
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Apple Computer, Numeric Keypad Technical Procedures (Apple II/IIe), rev. Sep 85, from Apple Service Technical Procedures: Archived Products Volume Two (072-0231). Figure A, p. 1.2 (rev. Dec 82); troubleshooting guide p. 1.3 (rev. Oct 84); Assembly/Disassembly pp. 1.6-1.7 with Figure D; Illustrated Parts List pp. 2.2-2.3; Appendix A, keyswitch identification, p. A.1. Hosted as File:Apple Numeric Keypad II and IIe Technical Procedures.pdf.