HP Laserjet 1200 on USB

Mike Harding mvh at ix.netcom.com
Sat Sep 20 18:07:22 PDT 2003


Thanks!  I was never able to get DMA to work with my printer...

Note that the ppc manpage, and the LINT file, don't mention drq at
all!  And lptcontl -e didn't indicate any problems either - it just
indicated 'polled' mode.

Somebody should update the ppc manpage, at least...

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   On Sat, 20 Sep 2003, Dag-Erling [iso-8859-1] Smørgrav wrote:
   >
   > 20 MB in five minutes is very close to the maximum transfer rate
   > across a paralell port (~80 kBps).

   You can do much better than that in ECP mode - I use it to transfer
   2Mbit/sec video to a piece of custom hardware hung of the parallel port
   (standard drivers at the FreeBSD end), so I'm getting over 250KByte/sec.

   However, the GENERIC kernel isn't configured for this - you need to add
   the DRQ setting:

   device          ppc0    at isa? irq 7 drq 3

   and make sure that the BIOS is configured to match.  After that,
   lptcontrol -e engages DMA-driven printing, with much greater speed and
   lower CPU utilisation.
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