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'More Printer Port Questions (Not Directly PIC Rela'
1997\04\10@114900 by Martin McCormick

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       I just saw a couple of messages about reading a P.C. parallel port.
I am attempting to read 8-bit data from one P.C.'s printer port with the
printer port of another P.C.  The two versions of the parallel port that I
have available as the receiver are the IBM MDA and the Hercules Graphics
Adapter (HGA).  The MDA is the old monochrome board with I think, a 6845
as the video controller.  I understand that there is a hack for reading from
this port.  I will need to read 8 bits at a time and then exercise the strobes
to fool the sending P.C. in to thinking it is talking to a printer.  This
will be a somewhat temporary arrangement so I am going for quick and dirty,
right now.  The data will only need to flow one way so only the MDA or HGA
board will need to receive.  I have been warned about the possibility of
burning out one of the ports by doing this and this is the reason for asking
the question.  If the port to be protected is the sender, I can put a TTL
buffer or line driver between it and the hacked receiver.  If it is the
receiver that is in danger, then I need to do something else.  I have seen
this discussion before, but I haven't found the magic search words to make
it resurface, yet.  Many thanks for any ideas.

Martin McCormick

1997\04\10@115932 by Mike

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At 10:41 AM 10/04/97 -0500, you wrote:
>        I just saw a couple of messages about reading a P.C. parallel port.
>I am attempting to read 8-bit data from one P.C.'s printer port with the
>printer port of another P.C.  The two versions of the parallel port that I
>have available as the receiver are the IBM MDA and the Hercules Graphics
>Adapter (HGA).  The MDA is the old monochrome board with I think, a 6845
>as the video controller.  I understand that there is a hack for reading from
>this port.  I will need to read 8 bits at a time and then exercise the strobes
>to fool the sending P.C. in to thinking it is talking to a printer.  This
>will be a somewhat temporary arrangement so I am going for quick and dirty,
>right now.  The data will only need to flow one way so only the MDA or HGA
>board will need to receive.  I have been warned about the possibility of
>burning out one of the ports by doing this and this is the reason for asking
>the question.  If the port to be protected is the sender, I can put a TTL
>buffer or line driver between it and the hacked receiver.  If it is the
>receiver that is in danger, then I need to do something else.  I have seen
>this discussion before, but I haven't found the magic search words to make
>it resurface, yet.  Many thanks for any ideas.

Use a LapLink cable.

Rgds

Mike

Some say there is no magic but, all things begin with thought then it becomes
academic, then some poor slob works out a practical way to implement all that
theory, this is called Engineering - for most people another form of magic.
                                                                      Massen

1997\04\10@161121 by )

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Try this location for a pretty good selection on parallel port info:


http://www.paranoia.com/~filipg/HTML/LINK/PORTS/F_Parallel.html

On the boards you have, the data lines are hardware output only. If your
boards are the "genuine article", then there is a unidirectional line
driver (some boards use an 'LS244) after the 8255 or 8255 like device.
Even if you change the port direction (I can't remember what the
register is called on an 8255), you still have a line driver that makes
the lines output only. There are 5 or 6 handshaking lines which can be
used as inputs, however. Another option is just to buy a couple of cheap
clone I/O boards at about $10 each which have bi-directional/ECP/EPP
ports on them.


Frank Richterkessing
Experimental Methods Engineer
GE Appliances

spam_OUTFRANK.RICHTERKESSINGTakeThisOuTspamAPPL.GE.COM



{Quote hidden}

1997\04\11@020849 by Mike

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At 01:56 PM 10/04/97 -0500, you wrote:
>       Excellent suggestion.  Does the LapLink cable have some kind
>of active device in it that handles the fact that on some old printer ports,
>one can only receive a nibble at a time?

The one I use has no active devices and transfers a nibble at a time, even
then its quite fast - I use it in Win 3.11 with Interlnk - a one way
peer to peer - one PC has to be  the server but, I can access all hard and
floppy drives etc through normal file manager on the other PC.

If anybody has a program for FULL peer to peer using an LPT port I'd
be real interested - I'm sure something like IPX should be the thing ?

Rgds

Mike
Perth, Western Australia

1997\04\11@032904 by taking

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Little Big Lan does this and is an excellent setup.  Also works
through serial and net cards as well, and can do combinations..



> If anybody has a program for FULL peer to peer using an LPT port I'd
> be real interested - I'm sure something like IPX should be the thing ?

1997\04\11@103354 by Wolfram Liebchen

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At 14:04 11.04.97 +0800, you wrote:
>If anybody has a program for FULL peer to peer using an LPT port I'd
>be real interested - I'm sure something like IPX should be the thing ?

Mike,

Windows 95 can do exactly this. You define a network connection via
DF†-Netzwerk (I only know the German word, is it "remote access service"?)
and direct LPT connection.

Both PCs have to have installed the workstation / server service,
same network protocol (NETBEUI is sufficiont)
then you have full peer to peer capabilities.

-- Wolfram



+-----------------------------------------------------+
| Wolfram Liebchen                                    |
| Forschungsinstitut fŸr Optik, TŸbingen, Deutschland |
| .....liebchenKILLspamspam.....ffo.fgan.de                         |
+-----------------------------------------------------+

1997\04\11@113441 by Mike

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At 04:30 PM 11/04/97 +0200, you wrote:
>At 14:04 11.04.97 +0800, you wrote:
>>If anybody has a program for FULL peer to peer using an LPT port I'd
>>be real interested - I'm sure something like IPX should be the thing ?
>
>Mike,
>
>Windows 95 can do exactly this. You define a network connection via
>DF†-Netzwerk (I only know the German word, is it "remote access service"?)
>and direct LPT connection.
>
>Both PCs have to have installed the workstation / server service,
>same network protocol (NETBEUI is sufficiont)
>then you have full peer to peer capabilities.

Thanks Wolfram,

Yes, I know about W95 but, I have W3.11 and I don't want to upgrade to
W95 unless its really worth it. Maybe when W98 has fixed lots of bugs,
there are lots of older and some good DOS programs which use plugin
EPROM programmers which don't work under W95 - thats one reason.

So I'm still lokking for an IPX type driver for a laplink cable for
use on the LPT ports between two W3.11 computers.

Surely someone could have already written a driver that goes from NETBEUI
or one of the other older ones to work with the LPT port ?

Rgds

Mike

1997\04\11@115527 by Martin McCormick

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       I want to thank those who have given me such good suggestions.  Now
that I know how the LapLink cable works, I don't think it is the best
solution for this problem.  I may just get a UART and feed the printer port
in to the transmitter and then convert the serial data to RS-232 levels and
feed them in to the spare serial port I do have on the receiving system.
I can then use Kermit to display and capture the data.  I have a 8250 UART
and a AYS6510 UART that came from a salvage operation and may be bad, but
is a start.  I should be able to make or fake the strobe signals to pump
the bytes out of the parallel printer port.  I can run the UART at 1200
baud or so and may be able to get away with not worrying about flow-control.
I may have almost everything I need on hand to make this parallel to serial
converter so I will give it a try.  Again, many thanks.  Knowing what won't
work is as valuable as knowing what will.

Martin McCormick WB5AGZ  Stillwater, OK 36.7N97.4W
OSU Center for Computing and Information Services Data Communications Group

1997\04\11@231120 by .EDU>

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>         I just saw a couple of messages about reading a P.C. parallel port.
> I am attempting to read 8-bit data from one P.C.'s printer port with the
> printer port of another P.C.  The two versions of the parallel port that I
> [...]
> this discussion before, but I haven't found the magic search words to make
> it resurface, yet.  Many thanks for any ideas.
>
> Martin McCormick

Suggested reading: ``Parallel Port Complete'' by Jan Axelson, ISBN 096508191-5.
With diskette.  Chapter 16: ``PC to PC Communications''.  And/or see his Web
page http://www.lvr.com.

Disclaimer: I paid cash for my copy; I'm not getting a commision for this plug!

Peter F. Klammer, Racom Systems Inc.                   EraseMEPKlammerspam_OUTspamTakeThisOuTACM.Org
6080 Greenwood Plaza Boulevard                            (303)773-7411
Englewood, CO  80111                                  FAX:(303)771-4708

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