The keyboard on the TI-99/4A is a 48 key, QWERTY, full-stroke keyboard. It had 2 shift keys, a control key, a function key, and an alpha-lock key. This keyboard was a major change over the keyboard which came with the TI-99/4.

TI used several manufacturers to produce their keyboards, but they all will work with any TI-99/4A console.

The keyboard is held to the case with 4 screws, and connects to the motherboard by way of a 15 pin cable.

If you would like to fix the alpha lock/joystick "bug" go here.

The above is a picture of a standard TI-99/4A keyboard.

The above is a picture of the back view of one of several keyboards used in the TI-99/4A.

The keyboard pictured above is a keyboard from a TI-99/4. As you can see there is a big difference between the two. This keyboard had 41 keys, and was called the "chicklet keyboard" due to the look and shape of the keys. The shift key on this keyboard worked similar to the function key on the 99/4A, since the 99/4 only used uppercase there was no need for a "real" shift key.

TI-99/4A Keyboard Schematic