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Questions about Parallel port
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Swoewiuf View Drop Down
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Joined: 22 Jan 2017
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    Posted: 22 Jan 2017 at 11:49pm
Hello everyone!

I bought an ASRock motherboard a year ago, and I now have a little project requiring the use of a parallel port. (My motherboard is a B150M Pro4S.) I do have questions about this technology since it is considered "legacy" Tongue

I?�m reading a little bit about the port and its improvement through the years, but I couldn't find the answers I'm looking for.

I want to know the difference between the two following settings in the ASRock UEFI:
  • "ECP and EPP-1.9 Mode"
  • "ECP and EPP-1.7 Mode"

There are two other settings in the drop-down menu ("Normal" and "Bi-Directional" but I think those refer to older technologies (earlier days of the parallel port).

I'll keep looking for answers and I'll post it here if possible. In the meantime, please help me! :P

Edited by Swoewiuf - 22 Jan 2017 at 11:51pm
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Xaltar View Drop Down
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Points: 22943 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 2017 at 12:04am
From what I remember, 1.9 was more advanced and handled handshaking more efficiently but was not compatible with some older devices. 1.7 retained backward compatibility with a wider range of devices but did not perform as well. 

This little write-up is rather technical but if you have any understanding of the concepts it should prove enlightening. 

http://retired.beyondlogic.org/epp/epp.htm    (copy paste link)

I'ts been a very long time since I played with parallel ports Big smile I remember setting up all kinds of weird things with parallel and COM ports back in the day, including a working link between 2 PCs. Ahh 512kb/s data rates, how far we have come. Also worth noting, 512kb/s was the maximum theoretical bandwidth, typically the best I could achieve for file transfers was about 300kb/s with high quality cables. 
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wardog View Drop Down
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Originally posted by Xaltar Xaltar wrote:

I'ts been a very long time since I played with parallel ports Big smile


Me too. And Amen for that fact.


And having said that I'll point you to where I used to look for/at BIOS settings when I first got started years ago. And years ago!


TechARP's BIOS Optimization Guide on EPP 1.7 and EPP 1.9:
http://archive.techarp.com/showFreeBOG253e.html?lang=0&bogno=84






Edited by wardog - 23 Jan 2017 at 8:37am
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 2017 at 8:42am
Too Normal and Bi-Directional are as they appear.

Bi-Directional is two way communications.


If you're doing a LPT project, these two items should have been covered in the the 1st chapter!?!
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