Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!shelby!portia!forel!karish From: karish@forel.stanford.edu (Chuck Karish) Newsgroups: comp.sys.ibm.pc.rt Subject: Re: Terminals and RS232 , rs442 for RT, AT bus.~r;~ Keywords: }iRT,AT, terminals, rs2}i32, ~rrs422 Message-ID: <5371@portia.Stanford.EDU> Date: 17 Sep 89 00:34:09 GMT References: <1842@altger.UUCP> Sender: USENET News System Reply-To: karish@forel.stanford.edu (Chuck Karish) Organization: Mindcraft, Inc. Lines: 41 In article <1842@altger.UUCP> logex@altger.UUCP (logex) wrote: >I want to connect some terminals to each [RT], but i have >seen that the machines have a board that show several >weird (very) connectors a the bac side of the chassis. >I want to know if every model of RT, regarding if >its tower or desktop type, has an AT compatible slot >inside (how many ?) , Both types have AT slots. The 6150 (tower) has eight; I think the 6151 (desktop) has 5. The disk controller uses one of the slots. >and if so, i suppose i can >plug any Rs232 multiport card inside the RT, i am >right ? Sure. >What i need is to connect serial devices to the RT's. >but seems the connectors used are no standard DB-25 type. The connectors are available from AMP. The pinouts are there in the hardware documentation. IBM sells cables, with a DB25 on one end and the special 10-pin connector on the other. You may wish to get some of these cables even if you get a third-party acync card, to make use of the two ports already present on your 6150's system board. AT serial/parallel adapters work fine in the RT, and are supported by the standard drivers under both AIX and 4.3. Of course, that card uses a DB9 connector for the serial port, not a DB25. I've set up IBM dot matrix printers on the parallel ports under both operating systems. They work with absolutely no fuss, just plug and print. If you buy a 4-port RS232 card from IBM, make sure you get a buffered one. Look at the part numbers on the four big chip packages on the card. You want the 16550 UARTs, not the 16450s. Chuck Karish karish@mindcraft.com (415) 493-9000 karish@forel.stanford.edu