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Article #1126Re: IRQ / ACK on PC Parallel Port
From: D_Man
Date: Fri, 29 Mar 2002 07:29
Date: Fri, 29 Mar 2002 07:29
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2387 bytes
jjkrikken@hotmail.com (JJ) wrote in message news:<a82a8f02.0203280656.25fd0118@posting.google.com>... > Sylvan Butler <Znospam+noZs_0203@hpb13799Z.Zboi.hpZ.com.invalid> wrote in message news:<slrnaa4krb.3mm.Znospam+noZs_0203@hpb13799Z.Zboi.hpZ.com.invalid>... > > On Wed, 27 Mar 2002 21:35:17 GMT, Werner Van den Eede <WernerVdE@Hotmail.com> wrote: > > > Does anybody know if it is safe to connect the pin 10 (ACK) directly to the > > > GND (pin 18-25) without the need of an extra resistor in between? Yes it is. It's port pin to port pin, common logic, one is an input, and the other is an output. No problems. Internally, the port if memory serves me has all of it's input pins wired with weak pullup resistors where pertinent, to eliminate erroneous conditions if there is no printer present. Pullups are high enough value such that shorting active low inputs directly to the signal ground on the same port (or just the ground for that matter) will not damage the port nor the resistors. DHM
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,9a74751e368804f3 X-Google-Attributes: gid112d1e,public X-Google-Thread: 115730,9a74751e368804f3 X-Google-Attributes: gid115730,public X-Google-Thread: ff242,9a74751e368804f3 X-Google-Attributes: gidff242,public X-Google-Thread: 107cee,9a74751e368804f3 X-Google-Attributes: gid107cee,public X-Google-Thread: 111d0a,9a74751e368804f3 X-Google-Attributes: gid111d0a,public X-Google-ArrivalTime: 2002-03-28 23:29:14 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!postnews1.google.com!not-for-mail From: chaka427@telus.net (D_Man) Newsgroups: be.science.electronics,sci.electronics.basics,sci.electronics.design,sci.electronics.equipment,sci.electronics.misc Subject: Re: IRQ / ACK on PC Parallel Port Date: 28 Mar 2002 23:29:13 -0800 Organization: http://groups.google.com/ Lines: 16 Message-ID: <b24af26f.0203282329.7093864b@posting.google.com> References: <pWqo8.36385$DE4.4891@afrodite.telenet-ops.be> <slrnaa4krb.3mm.Znospam+noZs_0203@hpb13799Z.Zboi.hpZ.com.invalid> <a82a8f02.0203280656.25fd0118@posting.google.com> NNTP-Posting-Host: 66.183.40.207 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1017386953 4580 127.0.0.1 (29 Mar 2002 07:29:13 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: 29 Mar 2002 07:29:13 GMT