Xref: utzoo comp.sys.amiga.tech:12255 comp.sys.amiga.hardware:1973 comp.sys.ibm.pc:51381 comp.sys.hp:5191 comp.graphics:11715 comp.periphs:2906 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!decwrl!sgi!jeremy@perf2.sgi.com From: jeremy@perf2.sgi.com (Jeremy Higdon) 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: <61086@sgi.sgi.com> Date: 28 May 90 19:36:15 GMT References: Sender: jeremy@perf2.sgi.com Distribution: inet Organization: Silicon Graphics, Inc., Mountain View, CA Lines: 18 In article , 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. I can send escape codes to the scanner and make it seek, turn > the light on, and perform a 'scan test', but I can't seem to _read_ any data > _from_ the scanner. Any commands that are supposed to make the scanner > send out data just seem to do nothing. Does HP use some strange kind of > handshaking in their scanner? (I'm using the HP developer manual for the > escape codes, but there is no mention of the hardware interface.) All the > other machines in our lab (HP PC's and Mac IIcx's) all use HP manufactured > interfaces, so there is no problem communicating with the scanner. > Does the Amiga parallel device support data input? Most parallel devices don't. This is why the ScanJet for the IBM PC came with a parallel board.