Article View: comp.sys.amiga.tech
Article #3573Re: Hewlett Packard Image Scanner
From: Valentin Pepelea
Date: Wed, 30 May 1990 17:57
Date: Wed, 30 May 1990 17:57
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1654 bytes
In article <May.27.21.30.32.1990.23246@topaz.rutgers.edu>
armhold@topaz.rutgers.edu (George Armhold) writes:
>
> Our lab owns an HP Scanjet Image Scanner. I'm trying to write a driver for
> for our Amiga 2000 using the Amiga's parallel.device. I can successfully
> execute any commands that don't require the scanner to send any data
> back to the Amiga. However, any commands that are supposed to return any
> data do not work.
Unlike the serial device, the parallel device is not bidirectional. Although
you can both read and write through the parallel device, a CMD_READ I/O
request has to be sent *before* the remote starts writing. If the remote starts
writing first, you risk hanging up the device.
Valentin
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!valentin From: valentin@cbmvax.commodore.com (Valentin Pepelea) Newsgroups: comp.sys.amiga.tech,comp.sys.amiga.hardware,comp.sys.ibm.pc,comp.sys.hp,comp.graphics,comp.periphs Subject: Re: Hewlett Packard Image Scanner Keywords: ScanJet, Amiga 2000, parallel interface problems Message-ID: <11969@cbmvax.commodore.com> Date: 30 May 90 17:57:43 GMT References: <May.27.21.30.32.1990.23246@topaz.rutgers.edu> Reply-To: valentin@cbmvax (Valentin Pepelea) Distribution: inet Organization: Commodore, West Chester, PA Lines: 20