Thread View: comp.sys.ibm.pc.rt
2 messages
2 total messages
Started by logex
Sat, 16 Sep 1989 06:41
Terminals and RS232 , rs442 for RT, AT bus.~r;~
Author: logex
Date: Sat, 16 Sep 1989 06:41
Date: Sat, 16 Sep 1989 06:41
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1242 bytes
Hi netlanders: I am working with a set of 3 IBM RT sytems, of the 'tower' model, and 3 of the desktop model, i dont have then model numbers at hand but, all of them are under IBM AIX operating system. I want to connect some terminals to each cpu, 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 ?) , and if so, i suppose i can plug any Rs232 multiport card inside the RT, i am right ? What i need is to connect serial devices to the RT's. but seems the connectors used are no standard DB-25 type. Any help would be appreciated. Ed. logex@altger.uucp logex@tchh.uucp logex@chinet.uucp
Re: Terminals and RS232 , rs442 for RT, AT bus.~r;~
Author: Chuck Karish
Date: Sun, 17 Sep 1989 00:34
Date: Sun, 17 Sep 1989 00:34
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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
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