Micro Switch CT Series
Contents
Overview
CT Series was a tactile full-travel membrane series from Micro Switch. CT Series keyboards were contact membrane, and were offered alongside SC Series capacitive membrane keyboards. See under SC, CT and ST Series for details of this group of series.
CT Series contained line of low-profile keycaps. The keycap mount, Honeywell mount, is covered by US patent 4421432 filed on the 4th of September 1981 and granted on the 20th of December 1983.
SD Series switches gained support for Honeywell mount keycaps with the SD16 and SD18 sub-series, whose chart dates to December 1985. The charts for 3CT Series however date to 1994.
CT series offered both double and triple-shot injection moulding.
Part listing
So far, only a few charts have been retrieved by Honeywell. These charts cover the following types:
| Cat. listing | Type | Row | Angle | Legended | 3CT Series chart |
|---|---|---|---|---|---|
| 3CT103 | 1 unit | 3 | 4° | Legended | 1 |
| 3CT103B | Blank | ||||
| 3CT103D | 1 unit, green LED window | 3 | 4° | Legended | 13 |
| 3CT103DB | Blank | ||||
| 3CT103G | 1 unit, red LED window | 3 | 4° | Legended | |
| 3CT103GB | Blank | ||||
| 3CT103P | 1 unit, pimpled | 3 | 4° | Legended | 23 |
| 3CT103PB | Blank | ||||
| 3CT103T | 1 unit tri-shot | 3 | 4° | Legended | 38 |
| 3CT103TDD | 1 unit deep dish tri-shot | 3 | 4° | Legended | 45 |
| 3CT103DD | 1 unit deep dish | 3 | 4° | Legended | 46 |
| 3CT103DDB | Blank | ||||
| 3CT103RB | 1 unit relegendable | 3 | 4° | — | 47 |
| 3CT103PT | 1 unit pimpled tri-shot | 3 | 4° | Legended | 88 |
| 3CT103EXB | 1 unit relegendable | 3 | 4° | — | 111 |
| 3CT103HK | 1 unit with homing bar | 3 | 4° | Legended | 112 |
| 3CT103HKB | Blank |
Documentation
- Micro Switch SC, KD, SD and CT Series advertisement, Computer Design, August 1981, pages 41–43 (scanned by Bitsavers)