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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