Torrance, California-based Ashton-Tate Corp says that dBase IV version 1.1, which it reckons is still the most widely-used personal computer database management system, is now available on Intel Corp 80386 and 80486 microcomputers running Unix: dBase IV for 386 Unix runs under Santa Cruz Operation Inc Unix System V/386 and Xenix 386, AT&T Co Unix System V/386, Interactive Systems Corp Unix System V/386 and ESIX System V. Prices start at $1,000, $1,900 for unlimited users on a single processor, run-time licences are $300, single user, $600 unlimited users per CPU, and it ships this week, giving the same look and feel as the MS-DOS version; most prog rams should run with little change.