Systems Enhancement Corporation Power Administrator 800

Agreed. Around the time of the PC/AT, several other manufacturers used DE9s for the (cut-down) RS232 port. Often, pins 2-8 had the same functions as on the DB25, with pins 1 and 9 of the DE9 being DTR and RI in some order. The HP110 ('Portable') and Portable+ do this -- here's the wirelist of the serial cable I made up for my machines .. HP110 RS232 DTE DE9-P DB25-P Shield-------------o 1 Prot Gnd 1 o---------Br----------o 20 DTR 2 o---------R-----------o 2 TxD 3 o---------O-----------o 3 RxD 4 o---------Y-----------o 4 RTS 5 o---------Gn----------o 5 CTS 6 o---------Bu----------o 6 DSR 7 o---------Pu----------o 7 Sig Gnd 8 o---------Gy----------o 8 CD 9 o---------Bk----------o 22 RI Nor have I. And also most manufactures totally abuse the handshake lines -- you're not supposed to use them for flow control, for example. Watch out for manufacturers who attempt to adhere to the standard here -- their devices work with almost nothing else :-). And I'd love to know what the designer of the HP82164 was thinking of -- some of the features of that device are plain _crazy_! -tony