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From: hacker@hera.Sbi.Com (Bill Hacker)
Newsgroups: comp.sys.next
Subject: DMA Underrun with NextPrinter
Message-ID: <622@waycool.hera.Sbi.Com>
Date: 22 May 91 22:01:59 GMT
Distribution: usa
Organization: Fulcrum - Salomon Brothers, NY
Lines: 44


I just got a brand new NextStation with a NextPrinter and it all 
works great, except for one maddening problem:

When I try to print, I might get a small portion of the page printed,
a blank page, and then a third page will run halfway through the
printer before it stops abruptly and a dialog box pops up reporting
an I/O error on the printer.

I looked in /usr/adm/messages and found:


     localhost npd[96]: PrintSpooler couldn't read sequence file 
              /usr/spool/NeXT/Local_Printer/.seq
     localhost mach: np0: spurious packet received, cmd = 87
     localhost mach: np0: DMA Underrun; Reprinting Page
     localhost mach: np0: spurious packet received, cmd = 87
     localhost mach: np0: DMA Underrun; Reprinting Page
     localhost mach: np0: spurious packet received, cmd = 87
     localhost mach: np0: DMA Underrun retries exhausted
     localhost npd[96]: NextPrinter write failed: I/O error

I occasionally will get a correctly printed page, but only rarely.

I've taken the printer into my dealer.  It printed fine (using my original
printer cable).  I just took the NextStation into the dealer (without
the printer).  It drove their printer fine).  I had checked my cable
connections, which seemed to be solid.

Does anyone have any idea why I'm having such a persistent problem when
both components seem to work fine at the dealer's?  Could it be electrical
interference on the cable?  Has anyone else had this problem and been
able to get it fixed?

Any e-mailed suggestions or comments would be most appreciated.

Thanks in advance.


-- 
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Bill Hacker               Fulcrum                 212-747-8360
                          Salomon Brothers Inc    hacker@hera.sbi.com
                          New York, NY