$ mcr sysgen config DEVICE> kda50 3 %SYSGEN-I-EQV_NOTICE, equivalent name - device KDA50 will be output as UDA DEVICE> Exit Device: UDA Name: PUA CSR: 772150 Vector: 154 Support: yes Device: UDA Name: PUB CSR: 760334* Vector: 300* Support: yes Device: UDA Name: PUC CSR: 760340* Vector: 304* Support: yes Note that the presence of a serial multiplexer will change things around a lot - for example: $ mcr sysgen config DEVICE> kda50 3 %SYSGEN-I-EQV_NOTICE, equivalent name - device KDA50 will be output as UDA DEVICE> dz11 1 DEVICE> Exit Device: UDA Name: PUA CSR: 772150 Vector: 154 Support: yes Device: DZ11 Name: TTA CSR: 760100* Vector: 300* Support: yes Device: UDA Name: PUB CSR: 760354* Vector: 310* Support: yes Device: UDA Name: PUC CSR: 760360* Vector: 314* Support: yes If you don't have a machine with CONFIGURE available, you can read Alan Frisbie's very excellent DECUS presentation on this subject at ftp://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/hardware… -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927