• For service node support, one of the following operating systems is required. VMS ULTRIX-32 MicroVMS ULTRIX-32m RSX-11M-PLUS with DECnet-11M-PLUS TOPS-10/20 DECnis 600 PSU auch H7720-AA/RSX with DECnis 600 PSU auch H7720-AA-Micro-RSX See the Software Product Description for the version number requirements. • For printer support, service node software is included on the DECserver 200 software distribution media. DECnis 600 PSU auch H7720-AA-AA Eight-line DECnis 600 PSU auch H7720-AA 200, 120 V (supports eight EIA RS-232 physical terminal connections). Includes U.S. country kit. DSRVB BA - Eight-line DECserver 200, 120 V (supports eight DECconnect terminal connections (DEC 423)). Requires country kit. DSRVB AB - Eight-line DECnis 600 PSU auch H7720-AA 200, 240 V (supports eight RS-232 physi- cal terminal connections). Includes country kit. DSRVB BB - Eight-line DECnis 600 PSU auch H7720-AA 200, 240 V (supports eight DECconnect terminal connections (DEC 423)). Requires country kit.