Parallel port operations?

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In the distant past there were applications that did direct access to the motherboard parallel ports (ISA). The application do not work with the plug & play (PCI) parallel ports.

If you know the base address of the PCI parallel ports are the registers the same as the original ISA ports?

I have asked this question of the board manufactures (like SIIG) and they refuse to answer.

Bob Macklin
Seattle, Wa

What I have tried:

I use VC++ version 5 to generate applications. It does not provide parallel port operations like it does for the serial port. It only provides standard printer services.

Posted 4-Apr-16 5:25am

macklinbob

Updated 4-Apr-16 18:00pm

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Jochen Arndt · Answer 1 · 2016-04-04T05:41:00

Solution 1

Really VC 5? For which Windows version?

Since Windows NT normal applications have no direct access to hardware. You always need a driver.

Because parallel ports are outdated, it is difficult to find still working examples. But this site may be a good starting point: Jan Axelson's Lakeview Research[^]

Posted 4-Apr-16 5:41am

Jochen Arndt

Comments

macklinbob 4-Apr-16 12:41pm

I can use the inp and outp instuctions to direct access the port if I know the base address.

I can find the base address in the Device Manager.

Bob Macklin
Seattle, Wa

Jochen Arndt 4-Apr-16 12:48pm

These functions will not work from user mode applications with NT (NT, 2000, XP, and later). They will cause a privileged instruction exception.

That is why I asked for the Windows version.

Sergey Alexandrovich Kryukov 5-Apr-16 0:01am

Despite the fact they are outdated, so many CodeProject authors worked with them. I cannot even understand why. Please see Solution 2. :-)
—SA

Sergey Alexandrovich Kryukov · Answer 2 · 2016-04-04T18:00:00

Solution 2

By some reasons, CodeProject is the resource with ridiculously high number of parallel port articles: Search — CodeProject[^].

—SA

Posted 4-Apr-16 18:00pm

Sergey Alexandrovich Kryukov