Subject: Re: CVS commit: src/sys/dev/ppbus
To: Daniel Carosone <>
From: Lennart Augustsson <>
List: source-changes
Date: 02/07/2004 16:06:46
I'm not sure if it would work either, but you can certainly do
byte I/O over a USB to Centronics adapter.
I guess I'll have to get some old // port device and try it. :)

	-- Lennart

Daniel Carosone wrote:
> On Thu, Feb 05, 2004 at 04:25:14PM +0100, Jaromir Dolecek wrote:
>>I don't think this is appropriate. At least, I always
>>thought ulpt is a unified protocol for talking to
>>printers via USB - you don't plug ZIP drive into
>>'ulpt slot' and expect it to work. Or is ultp
>>actually some kind of parallel port emulation
>>over USB?
> Well, I'm not sure about the specifics, but certainly as well as usb
> printers there are "usb parallel cables" that terminate in a usb at
> one end and a centronics printer // port at the other, and they are
> matched as ulpt.
> Whether you can plug a ZIP or whatever into that rather than a
> printer, I'm not sure, but I can imagine users expecting to be able
> to.  And, I suppose, if I had a laptop without "legacy" ports and only
> usb, I rather might want to.
> --
> Dan.