Keyboard TI-99/4A

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UNKNOW connector (inside the console)

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

Notes

  • Red wire is n.15
  • 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).

References

Category:Input Device Connectors

 

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