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From: geller@rlgvax.UUCP (David Geller)
Newsgroups: net.micro.pc
Subject: Re: Alphanumeric character in graphics mode display
Message-ID: <2068@rlgvax.UUCP>
Date: Tue, 3-Jul-84 14:06:23 EDT
Article-I.D.: rlgvax.2068
Posted: Tue Jul  3 14:06:23 1984
Date-Received: Tue, 10-Jul-84 04:37:14 EDT
References: <569@uofm-cv.UUCP>
Organization: CCI Office Systems Group, Reston, VA
Lines: 57

IBM ROM-BIOS interupt 10H will do this for you very nicely and
very easily. In Lattice "C":

/* set up CRT controller for graphics mode 320x200 color */

#include	<dos.h>
union	REGS	inregs,outregs;		/* 8088 registers - from dos.h */

set_mode_320C()
{
	inregs.h.ah = 0;	/* INT 10H function 0 - set mode */
	inregs.h.al = 4;	/* set mode to 320x200 color */

	int86 (0x10,&inregs,&outregs);	/* lattice interupt function */
}

put_c(c,x,y)	/* put character at position x,y */
char	*c;
int	x,y;	/* normal screen size - <80|40, etc. */
{
	/* move cursor to x,y */
	inregs.h.ah = 2;	/* set cursor position */
	inregs.h.dl = (char) x;	/* pass column */
	inregs.h.dh = (char) y;	/* pass row */
	inregs.h.bh = 0;	/* page zero */

	int86 (0x10,&inregs,&outregs);

	/* write character */
	inregs.h.ah = 10;	/* write char */
	inregs.h.cx = 1;	/* write only 1 character - no repeat */
	inregs.h.al = c;	/* assign passed character to al */

	int86(0x10,&inregs,&outregs);
}


I hope that this example hasn't been too nebulous. I did it this way to
illustrate what needs to go where without showing 8088 code. I suspect
that after setting the mode any printf or cprintf will do what you want.
Also - I recommed using the ANSI.SYS driver included with MS/PC/TELE-DOS,
etc. I'll post a "C" interface to ANSI.SYS real soon. PLEASE KEEP IN
MIND that these functions are dependent UPON IBM's ROM-BIOS. Hopefully
most of the compatible systems have the same hooks!

Refer to page A-48 in the DOS TECHNICAL REFERENCE MANUAL for more information
concerning this topic. Also note that in graphics mode (any of them) only
the first 127 characters of the  IBM PC character set may be displayed.
Another 127 may be defined, though (yes - the graphic symbols can't be
displayed out of character modes - who knows why?). See the DOS manual
for information regarding the ANSI.SYS driver.

					David P. Geller
					Computer Consoles, Inc.
	{seismo}!rlgvax!geller		Office Systems Group
					11490 Commerce Park Drive
					Reston, VA  22091