Mirroring Sun Microsystems Inc’s efforts in this area, Hewlett-Packard Co has rolled out a new range of ISDN products enabling stand-lone workstations to communicate over public or private ISDN networks. Included are the HP ISDN Link/S700 add-on board for its 720, 730 and 750 workstations – with transfer speeds of up to 128Kb per second – HP ISDN Server and HP ISDN Link/MS-DOS, which enable personal computers to use ISDN circuit switching services. All ship July 1: the ISDN Server is $18,400, an HP ISDN Link/S700 add-on board is $2,800 and the HP ISDN Link/MS-DOS board starts at $2,600.