Tetra is the third and final "pure" tablet, pen based, computer from IBM in the ThinkPad series.
Lacking a built-in keyboard, mouse pointer, floppy drive, or any ports aside from the Expansion Connector, this machine is meant to be used entirely with a stylus pen.
About Tetra:
| Manufacturer | IBM |
| Model | ThinkPad 730T |
| Manufactured | 1994 |
| Processor | Intel 486SX @ 33MHz |
| RAM | 24 MB |
| Storage | 1 GB CF Card x2 |
| Display | 9.5" DSTN Transflective LCD 640x480 |
| Ports & Expansion | Expansion Connector
3x Type II PCMCIA |
| OS | Windows for Pen Computing 1.0
Windows 3.11 IBM PC-DOS 7.0 |