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From: gt6294b@gitpyr.UUCP (SCHEUTZOW,MICHAEL J)
Newsgroups: net.micro.pc
Subject: Re: Printing in Bold (I'll try again)
Message-ID: <2240@gitpyr.UUCP>
Date: Wed, 10-Sep-86 12:59:46 EDT
Article-I.D.: gitpyr.2240
Posted: Wed Sep 10 12:59:46 1986
Date-Received: Wed, 10-Sep-86 22:03:48 EDT
References: <1104@masscomp.UUCP>
Distribution: net
Organization: Georgia Institute of Technology
Lines: 28

> There is a DOS function that prints out a string (terminated with a $) on
> the screen. This string is printed out with an attribute that I presume
> is determined in one of the following ways:
> 
> 	1) always normal intensity
> 	2) whatever attribute was at that location before
> 	3) a "default" attribute that is set somewhere in DOS
> 
This response is off-the-cuff, but it is my guess that DOS uses the
video-bios call named 'write teletype'.  If this is true, then option
2 is the only one which really exists (from DOS's point of view).  Note
however that if the screen scrolls, the "new" line at the bottom is 
set for "normal" characteristics, so when characters are written to it 
they will appear normal.

You should also note that 'bold', per se, is impossible without creating
a new character set.  Your choices are: underlined, normal intensity, high
intensity, reverse and flashing.  To get these will problably require the
use of of video-bios call 'write attribute and char'.  Also note that this
call will *not* advance the cursor (at least on my ATT6300).

I hope this helps.  I have a request: if the netter sees this on news, 
I'd appreciate it if he'd acknowledge it by email.  It seems like some 
of our news has been sent to /dev/null lately.

Mike Scheutzow
Georgia Tech
gt6294b@gitpyr.uucp