2

I'm using pure DOS 6.22 within Microsoft Virtual PC 2007 and everything works perfectly, except I can't change my display mode from 80 columns to 132. I tried MODE CON: COLS=132 and DOS complained about this.

It's my understanding that VESA has this capability and VGA does not. In UNIX, all you have to do is change to CO#=132 in terminfo to accomplish this.

Anyone know how I can achieve 132 in pure DOS?

|improve this question|||||
  • 1
    "In UNIX, all you have to do is..."? That was a strange assumption, as DOS is not a UNIX dialect. – TFM Jul 6 '11 at 4:30
  • I wonder how different Windows would be today if DOS was a dialect of UNIX? – Randolf Richardson Jul 11 '11 at 4:38
  • 1
    Even Windows 7 still feels like a GUI front-end to DOS. I guess they wanted to maintain upward compatibility with DOS, but that started to partially disappear after DOS 6.22. I was hoping Windows would have been totally re-designed to not have any DOS-like features such as the cmd.exe CLI. – Frank R. Sep 11 '11 at 5:06
2

The DOS "mode" command is very limited. You'll need to use a third-party tool called "vmode" which you can read about here:

  WPDOS Text Mode Survival Guide
  http://www.columbia.edu/~em36/wpdos/textmode.html

Within that document, search for "vmode.exe" and you'll find the following download link for this small tool:

  vmode.exe
  http://www.columbia.edu/~em36/wpdos/vmode.exe

I used this tool many years ago to increase the screen size with Norton Commander and various other DOS applications, and found it especially useful for developing my ASM programs to use any screen size (having a different number of columns proved very useful for testing).

I hope this is what you're looking for.

|improve this answer|||||
  • thank's i'll check it out.. I have a legacy INFORMIX-SQL (DOS) app and would like more than 80 columns wide for my forms so i can fit more things on one screen. – Frank R. Jul 6 '11 at 4:08
  • I look forward to finding out if this is a good solution for you. – Randolf Richardson Jul 6 '11 at 4:09
  • I downloaded and installed vmode from columbia univ's site and tried vmode 54h, 55h, 64h and 65h, but none of these worked.. although it made the DOS window larger, it cleared the display. i tried typing DIR to see if it would echo directory display and nothing happened. when i executed my app, it reverted back to 80 column as if i had cancelled vmode. my VGA BIOS version is SantaRosa 1478 on an Acer Laptop. – Frank R. Jul 6 '11 at 4:59
  • That means that your application is setting the video mode directly. I have encountered many languages from back in the DOS days for which the compiled output would reset the video mode if it was in some other unrecognized mode (and there was no option for the programmer to turn this off or control it in any way). It looks to me like this must be what's happening for you. Regarding the sketchy support for the more exotic video modes (that's what we used to call them for fun sometimes), some of the really cheap (as in super-low-cost) video cards screwed this up frequently. – Randolf Richardson Jul 6 '11 at 5:05
  • yes, most likely my apps runtime environment resets video to 80 X 24 DOS display, however before firing up my app, the screen went blank with those hex values. Im thinking there has to be a DOS VESA driver that could be loaded in CONFIG.SYS to achieve 132 X 40 display, otherwise nothings going to work. – Frank R. Jul 6 '11 at 5:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for?Browse other questions tagged or ask your own question.