USB LPT printer flushing issue

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USB LPT printer flushing issue

Postby Geri » 2018-05-07 15:43

My new computer has no LPT, so i have bought an USB LPT port.

It prints (proprinter compatible stuff in cups, libreoffice)., but the last few letters or the line is missing.
If i print a long multiple page long document, then only the last words from the last page is missing.

Therefore this is a buffer flushing issue. (If i start a new printing job, the top will may contain ascii garbage from the last unflushed printing).


Of course if i begin and end every document with a page with random few lined texts, then i can avoid this phenomon.
But i will forget that, and i will ruin my documents.

So i was thinking on what solution could i come up with, which will fix this buffer flushing issue. Any ideas?
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Geri
 
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Re: USB LPT printer flushing issue

Postby shep » 2018-05-07 17:04

This can also be an interface or timing issue. See this FreeBSD thread
https://forums.freebsd.org/threads/printing-text-to-network-printer.60075/#post-345104

Does your usb->lpt dongle have a confiuration interface?

The other possibility is page size/margins. My old HP Laserjet 5L had larger than normal margins

See https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1184663

This can also be a lack of printer memory
See Printer Issues
https://en.wikipedia.org/wiki/HP_LaserJet_5
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Re: USB LPT printer flushing issue

Postby Geri » 2018-05-07 17:09

thankyou for your time sheep

it does not have a config interface, but i have tried this source

https://hackaday.io/project/10512-poten ... ing-usblpc

i was able to set it into mode 1 and mode 2 but didnt helped (mode 3 not exists)

its a flush issue, not a margin issue (the printer does have a margin issue as well, but i know how to deal with that)
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Re: USB LPT printer flushing issue

Postby Geri » 2018-05-07 17:24

ok i workarounded this bug by adding a new page to every of my documents and filling them with one . characters for 16 lintes:
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
This fixes the flush problem, and will not put ascii garbage on the next printing job.
i will do this until linux developers do a driver patch for this, which will probably never happen as they still have 20 year old bugs unfixed
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