laser-lovers@ucbvax.UUCP (01/21/86)
We've just discovered a bizarre incompatibility between the LaserJet and
the LaserJet Plus. It appears that when you download a patch of raster
graphics to the LJ+, it comes out ten dots to the right of where it should!
Characters surrounding it, including characters that rely on the raster
sequence leaving the cursor in the right horizontal place, come out in
the proper locations, so it's not a cursor-positioning bug. A quick fix
is to insert a leftward ten-dot motion just before the "raster begin"
sequence and a rightward ten-dot motion just after "raster end". This
cleans things up in all the test cases we've tried so far.
The local HP people have been told; I will report further on this when
they get back to me.
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henrylaser-lovers@ucbvax.UUCP (02/06/86)
HP has gotten back to me about the LJ - LJ+ incompatibility I reported
earlier (in mixed text and raster data, the raster data is not in quite
the same place on the two printers: the LJ+ prints it about ten dots
to the right of where it is on the LJ).
HP claims that the problem is in fact a bug in the original LaserJet:
raster data was printed 8 dots to the left of where it should have been.
The LJ+ corrects the bug. Since our LJ typesetting software is a
commercial package, we've never had cause to investigate exact raster
positioning.
I dunno. Sure looks to me like the shift is 10 dots, not 8. And it's
still a very annoying incompatibility. But I thought I'd pass on the
official explanation.
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henry