Thread View: comp.sys.ibm.pc.rt
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6 total messages
Started by Benjamin Cline
Sat, 10 Oct 1992 14:49
serial port speeds
Author: Benjamin Cline
Date: Sat, 10 Oct 1992 14:49
Date: Sat, 10 Oct 1992 14:49
9 lines
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611 bytes
I have a RT with 2 of the 4 port RS232 serial boards (8 ports total). Anyone know what the maximum speed for these ports is? benji -- Benjamin Cline Systems Engineering, MathSoft, Inc: benji@mathsoft.com "Unix is a cruel mistress" "It's 3:00 am, I need a modem and some coffee!"
Re: serial port speeds
Author: Mark Whetzel
Date: Sun, 11 Oct 1992 07:40
Date: Sun, 11 Oct 1992 07:40
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In article <1992Oct10.144926.25225@mathsoft.com>, benji@mathsoft.com (Benjamin Cline) writes:
>
> I have a RT with 2 of the 4 port RS232 serial boards (8 ports total). Anyone
> know what the maximum speed for these ports is?
Under AIX, and I assume AOS as well, the IBM book SA23-2605-0
shows the adapter to have the following features:
Slot positions: 2,4,5,7,8
I/O addresses: range 1 1230-124F
range 2 2230-224F
range 3 3230-324F
range 4 4230-424F
Interrupt levels: 9, 10, 11 (see note below)
Bit rates: 50 - 19200 (set by program)
Bits per character: 5, 6, 7, 8 (set by program)
Maximum number: 4
Notes:
1) If the RT PC 4-port Asyncronous RS-232C adapter (buffered)
is instaled in the IBM RT PC 6192 Expansion Unit, only
interrupt level 9 can be used.
2) Interrupt levels CANNOT be shared between the system unit and
the RT PC 6192.
3) All interrupt levels are shared, but interrupt level 11 cannot
be shared with the SCSI adapter. Also, interrupt level 9 cannot
be shared with any of the 8-port async adapters.
Hope this helps.
Later,
markw
--
M. Whetzel
Home: markw@antimatr.hou.tx.us | IBM RT/125 running AIX 2.2.1
UUCP ..!uhnix1!lobster!antimatr!markw
Re: serial port speeds
Author: Mike Stefanik
Date: Sun, 11 Oct 1992 16:46
Date: Sun, 11 Oct 1992 16:46
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In an article, benji@mathsoft.com (Benjamin Cline) writes: >I have a RT with 2 of the 4 port RS232 serial boards (8 ports total). Anyone >know what the maximum speed for these ports is? 19200 bps under AIX 2.2.1 (the manual pages lie, extb doesn't work). Also keep in mind the magical 50 foot limit on RS-232 cable lengths. Personally, I've been able to squeeze more out of 'em, but I've also seen things get *really* flakey when I've stepped over that line. Fortunately, the third-party serial boards (eg: Dickens) didn't suffer from this abject stupidity. -- Mike Stefanik mike@pacsoft.com ...!uunet!pacsoft!mike (714) 681-2623 Pacific Software Group, Riverside, CA
Re: serial port speeds
Author: Peter Honeyman
Date: Wed, 14 Oct 1992 01:05
Date: Wed, 14 Oct 1992 01:05
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i'm running at 57,600. 115,200 loses. (we tried.) peter
Re: serial port speeds
Author: Mike Stefanik
Date: Wed, 14 Oct 1992 18:00
Date: Wed, 14 Oct 1992 18:00
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In an article, honey@citi.umich.edu writes: >i'm running at 57,600. 115,200 loses. (we tried.) What? The IBM serial cards for the RT under AIX won't go faster than 19.2k bps (and I'm reasonably sure that B50 and B75 aren't used to support the higher speeds). -- Mike Stefanik mike@pacsoft.com ...!uunet!pacsoft!mike (714) 681-2623 Pacific Software Group, Riverside, CA
Re: serial port speeds
Author: Peter Honeyman
Date: Fri, 16 Oct 1992 00:43
Date: Fri, 16 Oct 1992 00:43
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Mike Stefanik writes: |> What? The IBM serial cards for the RT under AIX won't go faster than 19.2k |> bps i run unix, not aix. peter
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