Re: Printer port confusion

On Thu, 04 Jan 2007 00:10:51 GMT, Randy Day <randy.day@xxxxxxxx>
wrote:

Is there a reason why different websites list different
signal states on some parallel port pins? Are some just
wrong, or were there two types of parallel ports for
PC's at one time?

For example:
http://et.nmsu.edu/~etti/fall96/computer/printer/printer.html
indicates that pins 10 and 15 are inverted inputs, while

http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm#p_input
has 10 and 15 as _normal_ inputs while *11* is inverted!

I just found out my PC has the latter pinout, while I
had wired a ciruit assuming that the first website (and
another that agreed with it) were correct.

<grumble>

I just want to know if I'm going to have problems with
pinouts if I want to hook a microcontroller to different
PC's and their parallel ports.

The other problem you will encounter is that modern
Windows PCs no longer have a software-accessible printer
port. Up through Win9x you could access it directly,
but now it requires a Ring 0 driver to allow access
by your software. GIVEIO and USERPORT are two
that I have heard of, but haven't used.

Best regards,


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!
.

Relevant Pages

  • Printer port confusion
    ... signal states on some parallel port pins? ... I just found out my PC has the latter pinout, ... PC's and their parallel ports. ...
    (sci.electronics.basics)
  • Re: Printer port confusion
    ... pinouts if I want to hook a microcontroller to different ... PC's and their parallel ports. ... The other problem you will encounter is that modern ... Windows PCs no longer have a software-accessible printer ...
    (sci.electronics.basics)