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- From: markw@antimatr.hou.tx.us (Mark Whetzel)
- Newsgroups: comp.sys.ibm.pc.rt,comp.sys.ibm.pc.hardware,comp.unix.bsd
- Subject: Re: RT 4-port card in 486 isa
- Summary: Here is some 4-port info
- Message-ID: <62@antimatr.hou.tx.us>
- Date: 29 Dec 92 11:59:18 GMT
- References: <1992Dec17.211743.2068@zip.eecs.umich.edu>
- Followup-To: comp.sys.ibm.pc.rt
- Organization: StarTrek and Lionel trains fan, Missouri City, TX
- Lines: 57
-
- In article <1992Dec17.211743.2068@zip.eecs.umich.edu>, dmuntz@quip.eecs.umich.edu (Dan Muntz) writes:
- > I'm trying to get an RT 16-bit 4-port card to work in a 486 isa box running
- > 386bsd. The card works if polled, or if another com device generates
- > interrupts (all ports are checked on any com interrupt), but the 4-port
- > card doesn't seem to be generating interrupts (IRQ 10). I've seen
- > two things in the RT tech ref.: 1) it looks like the 4-port card was
- > designed to work in a PC AT (I'm not certain of this) and 2) RT 16-bit
- > cards are supposedly *not* compatible with AT 16-bit cards.
- >
- > Some questions:
- >
- > 1) Are the 16-bit slots in an RT wired differently from those in an AT?
- > 2) If so, can this be corrected with a soldering iron: perhaps by cutting
- > the IRQ10 trace on the 4-port (which one is it?) and wiring it to
- > either the AT IRQ10 pin, or a lower IRQ line?
- >
- > Any info, slot diagrams, or random thoughts on the subject would be
- > appreciated.
-
- IRQ's on the RT are allowed to share interrupts, and most likely are
- tri-state driven. As far as I know, only slot 8 of the RT was
- unique, all others were standard AT slots, and slots 3 and 6 were
- XT 8-bit slots.
-
- Here is some info on the 4-port card that I posted to a request eariler
- in the year, might help..
-
- 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
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