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- Newsgroups: comp.os.os2.misc,comp.sys.ibm.pc.hardware,comp.os.msdos.misc
- Path: sparky!uunet!usc!cs.utexas.edu!torn!utcsri!geac!torsqnt!tmsoft!lsimages!whome!camaro!las
- From: las@camaro.uucp (Laszlo Herczeg)
- Subject: Re: Question about Parallel Port, please read
- References: <RiscwB1w165w@tcscs.UUCP> <4825@cruzio.santa-cruz.ca.us> <1992Dec28.195408.18942@mksol.dseg.ti.com>
- Organization: camaro
- Date: Thu, 31 Dec 1992 18:21:21 GMT
- Message-ID: <1992Dec31.182121.3930@camaro.uucp>
- Lines: 47
-
- In article <1992Dec28.195408.18942@mksol.dseg.ti.com> mccall@mksol.dseg.ti.com (fred j mccall 575-3539) writes:
- >In <4825@cruzio.santa-cruz.ca.us> nording@cruzio.santa-cruz.ca.us writes:
- >
- >
- >
- >>I really don't pay that much attention to the printer interrupt (IRQ7).
- >>I even have another device using it. It only would make sense with
- >>memory-resident print programs (DOS print, background printing features,
- >>etc.). It's different with COM ports. Also, IRQ2 may have special uses,
- >
- >IRQ2 is the cascade interrupt for the first controller. It will
- >automatically be remapped to IRQ9 (which is unused) by the
- >controllers.
- >
- >>IRQ6 is for floppy-disk drives, and IRQ5 is for hard drives.
- >
- >No, IRQ5 is the interrupt for LPT2:
- >
- >>Re-assignment
- >>of these interrups ... well... I couldn't recommend it !!!
- >
- >I suggest you investigate more fully. My machine at home is currently
- >configured as follows (using 2 I/O boards):
- >
- > COM1 - IRQ4 Serial Mouse
- > COM2 - IRQ3 Modem (16550AFN UART)
- > COM3 - IRQ2 Modem (16550AFN UART)
- > COM4 - IRQ5 Unused (but I've had a modem there, it works)
- > LPT1 - IRQ7 Laser printer
- > LPT2 - IRQ5 Unused (once used to link two machines, it works)
- >
- >Everything works fine. I not only RECOMMEND doing this; it is the only
- >way (other than multi-port boards with special drivers) to have more
- >than 2 usable COM ports that will work at the same time.
- >
- >--
- >"Insisting on perfect safety is for people who don't have the balls to live
- > in the real world." -- Mary Shafer, NASA Ames Dryden
- >------------------------------------------------------------------------------
- >Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
-
-
- I am interested in the parallel port being used to link two machines through
- IRQ5. Can you tell about this program you had?
- Thanks in advance!
- Laszlo
-
-