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Article #7304Re: Hardwareless Centronics -> HPIB converter ?
From: Don Novy
Date: Thu, 13 Sep 1990 22:29
Date: Thu, 13 Sep 1990 22:29
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1039 bytes
Directly connecting the 8 Centronics data lines to an HP-IB (IEEE 488) device will NOT work unless you change the software as the data must be inverted. i.e. Centronics is logic 1 = 5V but HP-IB is logic 1 = 0V. I designed a simple circuit to do this that I use with my Atari 800XL. As I recall, it uses 2 7414s, a 74123, and a 7474. I don't have the schematic handy, but I could try to do it in ASCII characters if you're interested. Since you wanted a no hardware approach, however, I at least wanted to pass this info along. Don Novy Hewlett-Packard don_novy@fc.hp.com
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!usc!samsung!uakari.primate.wisc.edu!sdd.hp.com!hplabs!hpfcso!hpfinote!denReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!usc!samsung!uakari.primate.wisc.edu!sdd.hp.com!hplabs!hpfcso!hpfinote!den From: den@hpfinote.HP.COM (Don Novy) Newsgroups: sci.electronics Subject: Re: Hardwareless Centronics -> HPIB converter ? Message-ID: <15880019@hpfinote.HP.COM> Date: 13 Sep 90 22:29:42 GMT References: <5462.26edec57@vax5.cit.cornell.edu> Organization: Hewlett Packard CICD Lines: 14