The EO PC was AT&T's venture into the fledgling personal digital assistant (PDA) market. The device was created by GO Corp., which was acquired by AT&T mainly for its PenPoint operating system. The $2,500 pen-based device was jam-packed with ports and features, which may have overwhelmed business customers. It contained I/O ports for a modem, parallel, serial, VGA out and SCSI, and came with a wireless cellular modem, a built-in microphone and a free subscription to AT&T EasyLink Mail for both faxing and e-mail. The EO PC never reached mainstream use and was shut down in July of 1994.