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Add a bit more detail about polled mode versus interrupt mode, including

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hints about printer speed in various modes.

Text frappe'd from FAQ.
This commit is contained in:
Michael Lucas 2002-01-22 14:21:28 +00:00
parent 739c8028f5
commit 2a0fdd998d
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=11801
1 changed files with 3 additions and 3 deletions
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6
en_US.ISO8859-1/books/handbook/printing/chapter.sgml
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@ -571,9 +571,9 @@ sio2: type 16550A</screen>
</listitem>
</itemizedlist>
<para>The interrupt-driven method is somewhat faster but uses up
a precious IRQ line. You should use whichever one
works.</para>
<para>The interrupt-driven method is usually somewhat faster but uses up
a precious IRQ line. Some newer HP printers are claimed not to work correctly in interrupt mode, apparently due to some (not yet exactly understood) timing problem. These printers need polled mode. You should use whichever one
works. Some printers will work in both modes, but are painfully slow in interrupt mode.</para>
<para>You can set the communications mode in two ways: by
configuring the kernel or by using the &man.lptcontrol.8;