HP Laserjet 1200 on USB
arg-bsd at arg.me.uk
Sat Sep 20 12:10:31 PDT 2003
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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