The Complete PC of Milpitas, California is ready with a low-cost voice-mail add-in board for MS-DOS-based computers that operates in background so that the computer answers the phone even while you are using your machine for standard computing tasks: the board uses proprietary circuitry to digitise human speech and proprietary compression algorithms to store them on hard disk; a five-minute message takes about 1Mb of storage space on the disk, or about 3Kb to 3.5Kb of disk space for each second of speech; the system will also enables several pople to have separate, private password-protected voice-mailboxes with personal messages for each mailbox; due out at the end of May, the system, costing $350, will need 384Kb CPU, MS-DOS 2.1 up, a hard disk, a touch-tone telephone, a touch-tone phone line; an external speaker, which plugs into the card, is also recommended.