The HP 300LX was one of the first handheld PCs designed to run the Windows CE 1.0 operating system from Microsoft. Originally announced in 1996, the HP 300LX was released together with the 320LX in the second quarter of 1997. Unlike other HPCs of the time, the resistive touch screen had a higher screen resolution of 640x240 with four shades of grey, rather than the standard 480x240 resolution of other devices, such as the Casio Cassiopeia A-10. The device also sported a full PC card slot, a serial link cable plug, and an infrared port.