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List:       caldera-users
Subject:    Re: Printer IRQ
From:       Daniel C Marvin <danielm () cs ! pdx ! edu>
Date:       1997-09-30 23:33:07
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Hmm... you can use tunelp to set lpd to use interrupt of your choice.

Something like tunelp /dev/lp0 -i 7  

if your printer burps when you do this your problem you've got the right 
irq and lp..

DM





On Tue, 30 Sep 1997, Sean Utt wrote:

> 
> I haven't noticed that it matters.  The IO port matters for which /dev/lp?
> you use, but linux doesn't use the interrupt on the parallel port, it
> polls the port status lines instead.  
> 
> If you look in /proc
> 
> cat /proc/devices
> Character devices:
>  1 mem
>  2 pty
>  3 ttyp
>  4 ttyp
>  5 cua
>  6 lp
>  7 vcs
> 
> Block devices:
>  2 fd
>  7 loop
>  8 sd
> 
> cat /proc/interrupts 
>  0:   38465520   timer
>  1:          6   keyboard
>  2:          0   cascade
>  3:    7331355   NE2000
> 11:     107675   aha1542
> 13:          0   math error
> 
> 0000-001f : dma1
> 0020-003f : pic1
> 0040-005f : timer
> 0060-006f : keyboard
> 0080-009f : dma page reg
> 00a0-00bf : pic2
> 00c0-00df : dma2
> 00f0-00ff : npu
> 02f8-02ff : serial(set)
> 0300-031f : NE2000
> 0330-0333 : aha1542
> 03bc-03be : lp
> 03c0-03df : vga+
> 03e8-03ef : serial(auto)
> 03f0-03f5 : floppy
> 03f7-03f7 : floppy DIR
> 03f8-03ff : serial(set)
> 
> 
> As you can see, lp shows up in devices, and ioports, but not in
> interrupts.
> 
> If you are not able to print, it is most likely that you are printing to
> the wrong /dev/lp? device.
> 
> Try doing
> 
> cat > /dev/lp0
> cat > /dev/lp1
> cat > /dev/lp2
> 
> and see which one doesn't come back with
> bash: /dev/lp1: No such device or address
> or 
> bash: /dev/lp2: No such device or address
> 
> 
> 
> Sean
> 
> 
> On Tue, 30 Sep 1997, william woods wrote:
> 
> > Folks, my printer is on default IRQ 7, I can change that in BIOS set up
> > with no prob, and win95 will print fine. Question is, how do I tell
> > Linux that I have changed IRQ's?
> > 
> > William
> > 
> > 
> > 
> 
> 

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