TI-99/4A Keyboard
From HwB
Available at the Texas Instruments TI-99/4A computers.
Pinout
UNKNOWN connector (inside the console) Red wire is #15
| Pin | 12 | 13 | 14 | 15 | 9 | 8 | 6 |
|---|---|---|---|---|---|---|---|
| 5 | = | . | , | M | N | / | |
| 4 | space | L | K | J | H | ; | |
| 1 | enter | O | I | U | Y | P | |
| 2 | 9 | 8 | 7 | 6 | 0 | ||
| 7 | fctn | 2 | 3 | 4 | 5 | 1 | lock |
| 3 | shift | S | D | F | G | A | |
| 10 | ctrl | W | E | R | T | Q | |
| 11 | X | C | V | B | Z |
Note:
Pressing a key closes the contact between corresponding row + column.
Since there are no diodes to prevent current going backwards, pressing 3
keys at a time often results in appearance of a "phantom" key at the 4th
corner of the square formed by these keys (e.g 8+7+3=phantom 4: current goes
pin15-7-8-3-pin7 as if 4 were pressed).