IBM 9373 console processor

Does anybody know how an IBM 9373 (smallish, one rack, S/370 machine) connects to the console processore, a PS/2 30 PC. The manual shows that you have to connect the cable from the 9373 (male DB-25) to the back, left side of the PC. Could be a serial port, but sounds strange; an S/370 would certainly want to speak SDLC/3270 and not an asyn protocol All info on this machine are welcomed. By the way, what is the general interest for an IBM 6150 RT/PC with docs and manuals. I've been offered one but don't want to collect too much stuff 8-) cheers e. ======================================================================== Enrico Badella email: enrico.badella(a)softstar.it Soft*Star srl eb(a)vax.cnuce.cnr.it InterNetworking Specialists tel: +39-011-746092 Via Camburzano 9 fax: +39-011-746487 10143 Torino, Italy Wanted, for hobbyist use, any type of PDP and microVAX hardware,software, manuals,schematics,etc. and DEC-10 docs or manuals ==========================================================================