ISC Collimation D40.59
The photographs below depict a Collimation D40 series D40.59 keyboard manufactured for ISC.
They keyboard uses a rather thick cable that terminates in a D-subminiature DB-25 plug with 16 positions populated.
The serial number is 773 and the part number is 1142-21.
Photos courtesy of Carl R. Friend.
The pinout is documented as follows, from the perspective of the host unit, in the order presented:
| Pin | Dir. | Assignment |
|---|---|---|
| 10 | In | 0A: Key data bit 1 |
| 9 | In | 1A: Key data bit 2 |
| 21 | In | 2A: Key data bit 3 |
| 8 | In | 3A: Key data bit 4 |
| 20 | In | 4A: Control |
| 7 | In | 5A: Shift |
| 19 | In | 6A: Key data bit 5 |
| 6 | In | 7A: Key data bit 6 |
| 12 | In | 4B: Not used |
| 23 | In | 5B: Not used |
| 11 | In | 6B: Not used |
| 22 | In | 7B: Key trigger |
| 2 | Out | 0̅A: Receive acknowledge |
| 14 | Out | 1̅A |
| 3 | Out | 2̅A |
| 15 | Out | 3̅A |
| 4 | Out | 4̅A |
| 16 | Out | 5̅A |
| 5 | Out | 6̅A: Bell |
| 17 | Out | 7̅A: −Key ACK |
| 13 | CPU reset | |
| 1 | “SN −Key Inturr.” | |
| 25 | +5 V | |
| 18 | GND |
All the pins for the Out direction (2–5, 14–17) are missing from the plug, as is pin 24 which is not included in the pinout.