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From: dwl10@amdahl.UUCP
Newsgroups: net.micro.cbm
Subject: Re: C-Power and printers
Message-ID: <3396@amdahl.UUCP>
Date: Mon, 23-Jun-86 08:14:32 EDT
Article-I.D.: amdahl.3396
Posted: Mon Jun 23 08:14:32 1986
Date-Received: Wed, 25-Jun-86 03:49:28 EDT
References: <1304@garfield.UUCP>
Organization: Amdahl Corporation, Columbia MD
Lines: 37
Summary: open doesn't look quite right.

In article <1304@garfield.UUCP>, jay@garfield.UUCP writes:
> This program:
> #include <stdio.h>
> main()
> {
> 	open(4,4,0);
> 	fprintf(4,"hello world\n);
> 	close(4);
> }
> 
> gave me as output:
> one line of graphic characters
> then a formfeed
> then some more graphic characters and HELLO WORLD at the end.
> 
> Any ideas.

I don't know if it makes any difference, but when I do the open to my
printer, I use:   open(4,4,"");

The open routine expects to find a pointer to a filename as the third parameter
. Perhaps it's taking whatever location zero is pointing to, and sending it
to the serial bus as a filename. Since the printer doesn't know what a file
name is, it just prints it.

Also, what kind of printer interface are you using, or is it a CBM printer?
Perhaps secondary chan 4 isn't the correct one to use.
-- 
-------------------------------------------------------------------
                               Dave Lowrey

"So it goes, so it goes, so it goes, so it goes. But where it's
 going, nobody knows"   [Nick Lowe]
                                ...!{ihnp4,cbosgd,hplabs}!amdahl!dwl10

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