DOS ain't dead - working in more than 1280*1024 under Dos

working in more than 1280*1024 under Dos (Developers)

posted by bretjohn , Rio Rancho, NM, 23.04.2013, 17:47

Should anybody care, I have an unfinished program I'm working on called EDID that downloads and displays the monitor information. I can send it to someone if they want it, including the source code.

I've found that some BIOS's aren't compatible with the EDID spec (including at least some virtual machines), a lot of monitors don't provide complete information in the EDID download, some BIOS's won't download information correctly for more than one monitor, etc. So the possibility of matching video card modes with monitor modes isn't always available, at least through the BIOS. In some cases, you'll end up needing to write custom vendor/model specific software.

I actually wrote this program when I was having problems getting Windows to work correctly with a second monitor. None of the Windows software I found could help me figure out the problem, so I started writing a DOS program. In the end, my problem turned out to be a bad cable.

Here's an example of the output for one of my monitors:

EDID 0.01, (C) 2009, Bret E. Johnson. Program to display EDID (Enhanced Display Identification Data) for monitors. The Screen may temporarily go black while the data is downloaded ... RAW EDID DATA ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ 00 FF FF FF FF FF FF 00-05 E3 60 20 00 00 00 00 ÿÿÿÿÿÿ ã` 00 16 01 03 80 2B 18 78-2A 2C C5 A4 56 50 A1 28 ?+ x*,Å¤VP¡( 0F 50 54 BF EF 00 A9 C0-81 80 81 C0 01 01 01 01 PT¿ï ©À?À 01 01 01 01 01 01 30 2A-40 C8 60 84 64 30 18 50 0*@È`?d0 P 13 00 B0 F0 10 00 00 1E-00 00 00 FD 00 32 4C 1E °ð ý 2L 53 0E 00 0A 20 20 20 20-20 20 00 00 00 FC 00 32 S ü 2 30 36 30 57 0A 20 20 20-20 20 20 20 00 00 00 FF 060W ÿ 00 0A 20 20 20 20 20 20-20 20 20 20 20 20 00 90 ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Monitor Index : 0 EDID Version : 1.3 Extension Blocks : 0 Manufacturer : AOC No Matching Record Found Model Number : 2060W Manufacture Date : Week 0 of 2012 Serial Number : Color Type : RGB Color Input Type : Digital Interlaced : No Pwr Mgmt Support : Active-Off / Low-Power Dimensions H x V: 432 x 240 mm (19.4 inch diagonal) Native Rez H x V: 1600 x 900 pixels Frequency Range H: 30 - 83 kHz Frequency Range V: 50 - 76 Hz Max Pixel Clock : 830 MHz Established Rez : 640x 480 @ 60Hz VGA 640x 480 @ 67Hz Mac II, Apple 640x 480 @ 72Hz VESA 640x 480 @ 75Hz VESA 720x 400 @ 70Hz VGA 720x 400 @ 88Hz XGA2 800x 600 @ 60Hz VESA 800x 600 @ 72Hz VESA 800x 600 @ 75Hz VESA 832x 624 @ 75Hz Mac II 1024x 768 @ 70Hz VESA 1024x 768 @ 75Hz VESA 1024x 768 @ 87Hz 8514A (Interlaced) 1280x1024 @ 75Hz VESA Reserved Rez : None Standard Rez : 1600x 900 @ 60Hz 16:9 1280x1024 @ 60Hz 5:4 1280x 720 @ 60Hz 16:9 Sync Type : Digital Separate, H+ V+ Sync Offset H x V: 24 x 1 pixels Sync Pulse H x V: 80 x 3 pixels Border H x V: 0 x 0 pixels Blanking H x V: 200 x 100 pixels Pixel Clock : 108.000 MHz Preferred Timing : Yes Default GTF : No Second GTF Supt : No Start Freq H : 64 kHz K-C-J-M Values : 32-16-16-8224 Std Color Space : No Gamma Factor : 2.20 Chroma Red : X = 0.641 Y = 0.338 Chroma Green : X = 0.315 Y = 0.629 Chroma Blue : X = 0.159 Y = 0.059 White Point : X = 0.313 Y = 0.329 Stereo : None

Post reply

Complete thread:

working in more than 1280*1024 under Dos - Damien, 22.04.2013, 21:17 (Developers)
- working in more than 1280*1024 under Dos - RayeR, 22.04.2013, 23:26
  - working in more than 1280*1024 under Dos - bretjohn, 23.04.2013, 17:47
    - working in more than 1280*1024 under Dos - RayeR, 23.04.2013, 22:25
      - working in more than 1280*1024 under Dos - bretjohn, 23.04.2013, 23:40
        working in more than 1280*1024 under Dos - Doug, 24.04.2013, 05:49
        working in more than 1280*1024 under Dos - RayeR, 24.04.2013, 12:43
        working in more than 1280*1024 under Dos - bretjohn, 24.04.2013, 18:32
        working in more than 1280*1024 under Dos - RayeR, 24.04.2013, 19:34
        working in more than 1280*1024 under Dos - bretjohn, 24.04.2013, 20:05
        working in more than 1280*1024 under Dos - RayeR, 25.04.2013, 10:41
        working in more than 1280*1024 under Dos - Doug, 26.04.2013, 05:05
        working in more than 1280*1024 under Dos - Damien, 26.04.2013, 17:06
        working in more than 1280*1024 under Dos - bretjohn, 26.04.2013, 18:34
        working in more than 1280*1024 under Dos - RayeR, 26.04.2013, 23:34
        working in more than 1280*1024 under Dos - Doug, 26.04.2013, 23:59
    - working in more than 1280*1024 under Dos - Zyzzle, 24.04.2013, 06:42
      - working in more than 1280*1024 under Dos - RayeR, 24.04.2013, 10:52
        working in more than 1280*1024 under Dos - Laaca, 25.04.2013, 07:33
      - working in more than 1280*1024 under Dos - bretjohn, 24.04.2013, 18:38
  - working in more than 1280*1024 under Dos - Damien, 01.05.2013, 17:47
    - working in more than 1280*1024 under Dos - RayeR, 02.05.2013, 17:17
      - working in more than 1280*1024 under Dos - Damien, 02.05.2013, 22:34
        working in more than 1280*1024 under Dos - RayeR, 06.05.2013, 20:00
        working in more than 1280*1024 under Dos - Damien, 07.05.2013, 18:56
    - working in more than 1280*1024 under Dos - tom, 02.05.2013, 18:12
      - working in more than 1280*1024 under Dos - Damien, 02.05.2013, 22:22
      - working in more than 1280*1024 under Dos - Zyzzle, 03.05.2013, 02:36
- working in LESS than 1280*1024 under Dos - DOS386, 28.04.2013, 15:26
  - working in LESS than 1280*1024 under Dos - Damien, 01.05.2013, 17:53
- working in more than 1280*1024 under Dos - freecrac, 28.08.2013, 06:27
  - working in more than 1280*1024 under Dos - freecrac, 28.08.2013, 06:29