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- ┌───────────────────────────────────────────────────────────────────────────┐
- │ OS/2 2.0 Technical Tips │
- │ From the │
- │ OS/2 Technical Support Team │
- │ Boca Raton, Florida │
- │ │
- ├───────────────────┬─────────────────────────────────────┬─────────────────┤
- │ File Name │ Description │ Number of pages │
- ├───────────────────┼─────────────────────────────────────┼─────────────────┤
- │ PRINT.FAX │ OS/2 Print Troubleshooting Guide │ 3 │
- └───────────────────┴─────────────────────────────────────┴─────────────────┘
-
-
- Problem: When trying to print to the LPT port in the system, OS/2 returns
- an error stating that the printer is off-line, off, or out of
- paper, or cannot write to LPTx. Also, the printing may have
- worked under DOS, but does not work under OS/2.
-
- Resolutions: Check the following.
-
- * Verify that the system is operating properly by running diagnostics
- on the system or getting it checked by a service rep.
-
- * If there is a NON-IBM parallel adapter in the system, verify that the
- non-IBM adapter is configured for IRQ7 and a different port
- address than any other adapter in the system. Note the
- recommended port/IRQ combinations for the EISA and Micro Channel
- systems as described at the end of this troubleshooting guide.
-
- * If this is an EISA system with an AT type parallel port adapter
- in the system, make sure that no other adapter uses the same IRQ
- as the printer port.
-
- * If there is an (LAN, MIDI, serial, sound) adapter such as a bus
- mouse that uses the same IRQ as the LPT port, reconfigure the
- other adapter to use a different IRQ.
- In particular if you are using a SoundBlaster card, it is
- configured by default to use IRQ7. Reconfigure to use IRQ10
- instead
-
- * Ensure that there are no other parallel ports in the system trying to
- use IRQ7 and/or the same port address. Change the jumpers or
- switches to configure appropriately leaving LPT1 configured
- as IRQ7. Note the recommended port/IRQ combinations for ISA (AT)
- systems as described at the end of this guide.
-
- * Ensure that LPT1 is configured for IRQ7 and not IRQ5
-
- * Bus mice usually use IRQ5 so if printing is failing too, or LPT2
- is recognized, reconfigure the mouse for a different IRQ.
-
- If this problem persists after trying the above, or none of the above
- can be done due to hardware restrictions, the adapter may need to be
- replaced or upgraded. Some older 8-bit Parallel port adapters do not
- work with OS/2.
-
-
- Problem: Receive printer pop-up that the printer is off-line or it is not
- responding when starting a print job.
-
- Resolution: Check the following.
-
-
- * Problems have been found when using certain parallel port
- printer cables that do not meet the parallel port specifications.
- Cables that are longer than six feet in length are suspect.
- Cables that do not contain all 25 wires will not work under OS/2.
- Problems with cables longer than six feet in length are more
- evident on higher speed processor systems.
-
- * Hold the printer queue, send a job and make sure the job makes it
- to the queue. If not, the printer object is not installed
- properly. Otherwise, it is probably hardware related. Also, you
- can try using the IBMNULL printer driver so that we can insure
- that the printer driver is not at fault.
-
-
- Problem: Erratic or slow printing
- Resolution: Check the following.
-
- * The parallel port card is probably of older vintage and does not
- interrupt correctly. Adapter will need to be replaced unless a system
- board problem is evident, or the adapter card address and
- interrupt level do not match supported pairs. Please refer to
- diagram below.
-
- * If there are three LPT ports in a (AT/EISA) system, using AT
- technology cards, it will be normal for one of the parallel ports
- using IRQ7 not to work at the same speed since the AT class
- system does not share interrupts. One of the parallel ports will
- be running off a simulated interrupt that runs off the system
- timer services, which will be the one that is running slower.
- Please refer to diagram below.
-
- * Ensure that the printer is in the correct emulation mode for use with
- the driver installed. NOTE: Not all printers really emulate 100% so
- we can't guarantee that the driver will work fully with a emulating
- printer.
-
- ---------------------------------------------------------------------
-
- Following are the hardware setups for the different bus types; ISA
- (or AT), EISA, and MicroChannel (MC).
-
- Note that EISA bus systems with EISA parallel port cards installed
- will support interrupt sharing just as the MC bus systems.
- However EISA bus systems with ISA parallel port cards installed
- will NOT support interrupt sharing, and therefore must be
- configured to use different interrupts.
-
- Two parallel port hardware setups for the different system bus
- and adapter types:
-
- ISA/EISA (ISA Adapter) EISA (EISA Adapters)/MC
- _________ ________
- 3BC/IRQ7 LPT1 3BC/IRQ7
- 278/IRQ5 LPT2 378/IRQ7
-
- Alternate 2 parallel port setup when I/O parallel port cannot
- be set to 3BC:
-
- ISA/EISA (ISA Adapter) EISA (EISA Adapters)/MC
- ________ ________
- 378/IRQ7 LPT1 378/IRQ7
- 278/IRQ5 LPT2 278/IRQ7
-
- Three parallel port hardware setup recommended:
-
- ISA/EISA (ISA Adapter) EISA (EISA Adapters)/MC
- _________ ________
- 3BC/IRQ7 LPT1 3BC/IRQ7
- 378/IRQ7 LPT2 378/IRQ7
- 278/IRQ5 LPT3 278/IRQ7
-
- Note that in the 3 parallel port setup case in ISA bus systems and
- in EISA bus systems with ISA adapters, LPT1 and LPT2 are both
- configured for IRQ7. This setup is still legal, as OS/2 contains
- an algorithm that resolves the resource conflict by using the
- timer interrupt.
-
- -------------------------------------------------------------------
-
- The file PRDESC.LST on the OS/2 V2.0 device driver diskette one
- contains a list of device drivers to use for some common printers.
-
- If your printer is not on the list, but will emulate a printer on
- the list, try using the device driver for the emulated printer.
- You may also try using the IBMNULL device driver.
-
- The file PRDRV.LST also on the OS/2 device driver diskette one
- lists the printer drivers by their device file name and shows the
- device driver diskette for each.