Thread View: comp.os.msdos.programmer
2 messages
2 total messages
Started by Kevin D. Quitt
Fri, 10 Aug 1990 18:28
25 vs. 43 lines, 80 vs 40 columns
Author: Kevin D. Quitt
Date: Fri, 10 Aug 1990 18:28
Date: Fri, 10 Aug 1990 18:28
60 lines
2069 bytes
2069 bytes
Ok, folks, I need help. I've got a system where I'm switching back and
forth between graphics mode, 80x25, 80x43, and 40x25. I have yet to
find a completely reliable way of changing from each of these to any of the
others. Using MSC's _setvideomode doesn't hack it, because they don't
support 43/50 line mode.
Here's my code (condensed):
For 80 by 25 mode, I've tried both of the following. This generally seems
to work, but not always.
regs.x.ax = 0x0003; Technique 1
int86( 0x10, ®s, ®s );
_setvideomode( _DEFAULTMODE ); Technique 2
_setvideomode( _TEXTC80 );
For 40 by 25 mode. It reliably switches to 40 columns, but not to 25 lines.
_setvideomode( _DEFAULTMODE );
_setvideomode( _TEXTC40 );
For 80 by 43 mode. This works.
set_25_lines();
regs.x.ax = 0x0300; /* Ask about the cursor */
regs.h.bh = 0;
int86( 0x10, ®s, ®s );
regs.x.ax = 0x1112; /* Load ROM 8x8 double-dot font */
regs.h.bl = 0; /* Page zero */
int86( 0x10, ®s, ®s );
Graphics mode (EGA 640 by 350, 16 colours)
regs.x.ax = 0x0010; This doesn't work
int86( 0x10, ®s, ®s );
_setvideomode( _ERESCOLOR ); This does.
Has anybody got code that does this that really works?
--
_
Kevin D. Quitt demott!kdq kdq@demott.com
DeMott Electronics Co. 14707 Keswick St. Van Nuys, CA 91405-1266
VOICE (818) 988-4975 FAX (818) 997-1190 MODEM (818) 997-4496 PEP last
96.37% of all statistics are made up.
Re: 25 vs. 43 lines, 80 vs 40 columns
Author: Joe Huffman
Date: Sat, 11 Aug 1990 19:04
Date: Sat, 11 Aug 1990 19:04
115 lines
7004 bytes
7004 bytes
In article <475@demott.COM>, kdq@demott.COM (Kevin D. Quitt) writes:
>
> Ok, folks, I need help. I've got a system where I'm switching back and
> forth between graphics mode, 80x25, 80x43, and 40x25. I have yet to
> find a completely reliable way of changing from each of these to any of the
Here is what I use for the 80 column text modes. It's easy to adapt to
the other modes if you know the mode numbers. It's assembly code for
stand alone .com files (included) you should be able to easily adapt it
to be callable from your 'C' program...
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--
joe@proto.com
uunet!proto!joe
FAX: 208-263-8772
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