Cap 60/pl126 and Personal Laserwriter NTR

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3 total messages Started by Wayne Cripps Mon, 28 Dec 1992 00:49

#3494

Author: Wayne Cripps
Date: Mon, 28 Dec 1992 00:49

15 lines
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Looks like I just missed a posting on this subject, so I
will start again...  I am using CAP to print from Unix to
printers on appletalk network, and it has worked for IIg, NTX,
and older printers.  The unix boxes are sun IPC 4.1.1/Cap 60 pl100
(Phase 1) and Ultrix 4.3/Cap60 pl126, phase 2.  The NTR is visible
from a mac's finder but not from atlook/atlooklws or lwpr.
What is going on?

	Wayne
-- 

	Wayne Cripps
	wbc@sunapee.DARTMOUTH.EDU
	Bradley Hall, Dartmouth College, Hanover N.H. 03755 (603) 646-3198

Re: Cap 60/pl126 and Personal Laserwriter NTR

#3505

Author: Eric Sisson
Date: Wed, 30 Dec 1992 21:19

21 lines
1633 bytes

In article <1992Dec28.004953.22588@dartvax.dartmouth.edu> wbc@moosilauke.dartmouth.edu (Wayne Cripps) writes:
>
>Looks like I just missed a posting on this subject, so I
>will start again...  I am using CAP to print from Unix to
>printers on appletalk network, and it has worked for IIg, NTX,
>and older printers.  The unix boxes are sun IPC 4.1.1/Cap 60 pl100
>(Phase 1) and Ultrix 4.3/Cap60 pl126, phase 2.  The NTR is visible
>from a mac's finder but not from atlook/atlooklws or lwpr.
>What is going on?

I have encountered the same problem running CAP 6.0, pl126, phase 2,
on a Sun SPARCstation 2 with SunOS 4.1.3.  I am able to see several
different kinds of printers (IIg, NTX) but not the Personal LaserWriter
NTR.  If anyone has an explanation for this, please post it to the group.
Thanks.

-- 
Eric M. Sisson                        Internet:  ems@jackalope.mda.uth.tmc.edu
Programmer Analyst III                                    voice:  713-792-6466
Academic and Research Computing - Box 549                   fax:  713-794-5072
The University of Texas M. D. Anderson Cancer Center

Re: Cap 60/pl126 and Personal Laserwriter NTR

#3508

Author: Dave Platt
Date: Thu, 31 Dec 1992 01:54

29 lines
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>>                                       The NTR is visible
>>from a mac's finder but not from atlook/atlooklws or lwpr.
>>What is going on?
>
>I have encountered the same problem running CAP 6.0, pl126, phase 2,
>on a Sun SPARCstation 2 with SunOS 4.1.3.  I am able to see several
>different kinds of printers (IIg, NTX) but not the Personal LaserWriter
>NTR.  If anyone has an explanation for this, please post it to the group.

Cause:  the LaserWriter II NTR does not calculate DDP checksums
properly.  Macs do not bother verifying DDP checksums;  CAP does.  CAP
is discarding the packets sent by the NTR on the reasonable assumption
that they have been damaged in transit.

Cure:  upgrade to CAP 6.0 pl125.  You can disable DDP checksums
entirely, but it's better to simply run atlook, atlooklws, lwsrv, and
so forth with the -k option which selectively disables DDP checksum
validation on a connection-by-connection basis.

Other printers affected:  some Tektronix Phaser printers, and some QMS
printers, also exhibit this problem.

Other steps required for fix:  if you are using a FastPath running
K*Star as a gateway between Ethertalk and Localtalk, you must disable
DDP checksum validation in K*Star.
-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2470 Embarcardero Way, Palo Alto CA 94303

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