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From: daveb@amiga.UUCP (Dave Berezowski)
Newsgroups: net.micro.amiga
Subject: Re: Graphics Line Overlay with Dot Matrix Printer (need help)
Message-ID: <572@amiga.amiga.UUCP>
Date: Mon, 20-Jan-86 10:00:44 EST
Article-I.D.: amiga.572
Posted: Mon Jan 20 10:00:44 1986
Date-Received: Tue, 21-Jan-86 08:59:15 EST
References: <3030@vax4.fluke.UUCP>
Distribution: net
Organization: Commodore-Amiga Inc, Los Gatos, CA
Lines: 63
Summary: epson gfx overlaay fix

In article <3030@vax4.fluke.UUCP>, star@fluke.UUCP (David Whitlock) writes:
> I need an answer and sofar have not found one!
> 
> I have been using Deluxe Paint for a few months now, doing simple black
> on white syntax diagrams (very boring stuff).  The problem that I am having
> is that when I dump the picture to lets say a Panasonic KX-P1093 dot matrix
> printer, the last row of dots in the slice gets overlayed with the top row
> of dots of the next pass.  What this means (or looks like) is instead of a
> consistant shade of black, it is interlaced with a one dot overstrike every
> pass.
> 
> 		111111111111
> 		111111111111
> 		xxxxxxxxxxxx
> 		111111111111
> 		111111111111
> 		xxxxxxxxxxxx
> 
> 		    etc.......
> 
> I know you may suggest, did I read the manuals, try all the preference
> settings etc. Of course!  So what gives.  I've talked t two local dealers
> and they experience the same problems on an Okimate 20, all Star and Epson
> printers and the list goes on.  EA claims it is not their problem, I verified
> this because a dump of MEMO to the printer does the same thing.  My only
> thought is the EPSON printer drivers?  Amiga HELP...........
> 
> 
> -- Dave Whitlock
> 
>         {decvax!microsof,uw-beaver,ssc-vax,allegra,lbl-csam}!fluke!star
> 
> John Fluke Mfg. Co., 33031 Schoolcraft Road, Livonia, MI 48150


	Ok, I admit it I goofed!  The code inside the epson driver tells
the printer to advance 7/72 inch each time a pass of the print head
is made instead of the proper 8/72 inch. Unfortunately, up until now,
no one had caught this error. This will be fixed in the next release
(rev 1.2) of the software. There is a solution until then though.
The source code for the epson driver will be in the ROM kernal manual
and you can type it in, change the line in error, and re-compile it.
I'll try to get the change in the manual but it may be too late.

	The line in error is in the epson 'render.c' function.

INCORRECT:
if (err=(*(PD->pd_PWrite))("\0331",2)) return(err);
/* select 7/72 inch spacing */

CORRECT:
if (err=(*(PD->pd_PWrite))("\0333\030",3)) return(err);
/* select 24/216 (8/72) inch spacing */

	Sorry for the inconvience. Please note that this only affects
the EPSON, EPSON_JX-80, and MPS-1000 drivers. All the other gfx
drivers are correct. This problem is NOT in the Okimate-20 driver.
Okimate has released a new eprom for the Okimate-20 which gives
the user the option of overlapping lines (sometimes) or
white spaces between lines (sometimes). This is due to the
'play' in the paper advance mechanism.

	Regards, David Berezowski (CBM/AMIGA East Coast)