Problem: LBP8 printer not found when using printool in Redhat Linux

Problem: Ghostscript prints pages to LBP8 off-center

Problem: The printer issues a "Load A4" when printing

The GSDriver entry in the file /usr/lib/rhs/rhs-printfilters/printerdb

reads:     GSDriver: lpb8

should be: GSDriver: lbp8

I raised this issue when RH 5.0 was released, it is still not resolved in 5.1 (Am I the only one left with a lbp8?)

The printool will not list the canon lbp printer because of a character transpostion in the printerdb.

The Fix: edit printerdb, changing lpb8 to lbp8.  Restart printtool and the lbp8 should showup.

This problem apprears to have been corrected in GS version 5, making this section a historical artifact. This printer is now ten years old and still going :-)
 
 

------------   News post begins -------------------
Subject:      lbp8 driver problem and fix?
From:         0blik01@almere.flnet.nl (Henk Blik)
Date:         1996/12/28
Message-Id:   <32C59B11.16C89A89@almere.flnet.nl>
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I did try to mail the following directly to the authers but it seems
there e-mail adresses ain't up to date any more so I drop it here.


Hi,

Using ghostscript 3.33 with my Canon LBP4+ with A4 paper I noticed that
some of the pages were losing information at the bottom of the page.
Following such a page were several pages that al had just one line of
plotdata. Drawing a ruler showed that the ruler was lowered by about .2
inch. Same oproblem occured using an LBP8-III printer. (LBP4+ and
LBP-III are compatible and use the same version of CaPSL). Looking into 
the source of gdevlbp8.c and the CaPSL III programmers manual
Understanding CaPSL Language (positial commands) I found that the
problem was caused by the fact that the upper left point of the
effective print area is not 0, 0 but 0, -63 (in units of 1/100"). The
driver starts to plot a coordinate 0, 0 which is in effect 63 lines to
low. You cannot specify an absolute move to coordinate less than zero so
I solved the problem by first an absolute move, followed by a relative
move. I don't have access to CaPLS II manuals but giving the fact that
the Canon-LBP8 III is upwards compatible with the LBP8-II, the same
problem may arise with the LBP8-II printers. I do have access to the
CaPLS IV Programmers Manual CaPSL IV Command Reference (and a LBP8-IV
printer) and it also says that the origin is located 63/300 inch below
the top of the effective print area (move absolute).
I don't no the effects for a LIPS III printer but it might be worth
looking into it.

---------------- cut her -----------
--- gdevlbp8.c~ Wed May 29 20:48:33 1996
+++ gdevlbp8.c  Thu Dec 26 21:07:35 1996
@@ -112,8 +112,21 @@
                                out_count = end_data - out_data;
 
                                /* move down */
-                               CSI_print_1("%c%dd", lnum);
-                               /* move across */
+                     /* The top dot line of the printable area has not 
*/
+                     /* logical coordinate 0 but logical coordinate -63
*/
+                     /* it is not possible to goto_absolute negative */
+                     /* thats why we use a relative up command */
+                     /* for the first 63 lines (12-24-96, Henk Blik) */
+                               if (lnum < 63) /* top line print area is
-63 */
+                               {
+                                       CSI_print_1("%c%dd", lnum); 
+                                           /* cannot goto neg values */
+                                       CSI_print_1("%c%dk", 63); 
+                                           /* move up relative */
+                               }
+                               else
+                                       CSI_print_1("%c%dd", lnum - 63); 
+                               
                                CSI_print_1("%c%d`", num_cols);
 
                                /* transfer raster graphics */
--------------------- end of patch -----------------------------------

Description: Each time a print job is sent to the printer, it issues a "Load A4" message.

Fix: if what you want is to print letter sized paper, change the following line in the source (gdevlbp8.c):

FROM:

CSI, '1', '4', 'p',  /* select page type (A4) */

TO:

CSI, '3', '0', 'p',  /* select page type (letter) */

Recompile and it should print letter sized paper.

blogan@chipotle.org