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Compaq released Aero 4/25 and 4/33 small notebook computers in 1994. They were one of the first computers of small factor, they had even no floppy disk drive nor CD drive - everything was external. This gave the machine possibility to be ultra-portable. Compaq experimented with pointing devices by using trackball in different places - in this unit is is on the right part of casing while buttons ae located on its side, in other models they moved trackball to the lid, right below LCD, while buttons were on the other side - you had to grab it and move the ball with thumb, pressing buttons with index and middle finger.
The computer had to be energy-efficient, so it has a small, low-power 486SX processor running at 33MHz. On board, there is 4MB of RAM expandable by modules. Models were equipped with drives from 84MB to 250MB. Aero notebooks were supplied with MS-DOS and Windows 3.x, floppy drive was PCMCIA-based. Simulatnaously a LapLink-like solution was pre-installed to transfer data by COM port. Although video card had 512kB, only 256kB was accessible allowing 640x480 to be displayed.
Because of their small size these computers were quite expensive and never got true popularity. However there are still some fan-clubs of these small computers.