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VGATEST ================================================================================ Simple DOS program used to test VGA functionality in both text and graphics modes. It can be compiled using Open Watcom for: * 32-bit DOS/4G (80386+ CPU and DOS/4GW extender required) * 16-bit DOS (8086+ CPU required) Precompiled binaries: * VGATEST.EXE is the 32-bit DOS/4G version * VGATEST0.EXE is the 16-bit DOS version Source code at https://github.com/barotto/VGATEST !!! Disclaimer !!! -------------------------------------------------------------------------------- This program can and will damage the computer that you'll use it on and all of its attached peripherals. The author(s) cannot be held responsible for any damage occurred by the use of this program. Use at your own risk! Alphanumeric (A/N) tests -------------------------------------------------------------------------------- Font Maps demo -------------- This demo shows the double font map capability of the VGA that can be used to display 512 different characters on screen. Font map 0 is the default BIOS map. Font map 1 is a 8 pixels wide BIOS map loaded with INT 10/AX=11--h Font maps 2-7 are custom maps. Keys: 0 to 7 = change Map A's font. ESC = exit Split & Pan demo ---------------- This demo shows the split screen and panning features. Keys: + = increase start address value - = decrease start address value ARROW UP = increase vertical panning value ARROW DOWN = decrease vertical panning value ARROW LEFT = decrease horizontal panning value ARROW RIGHT = increase horizontal panning value PAGE UP = decrease split screen scanline value PAGE DOWN = increase split screen scanline value ESC = exit Benchmark --------- Performs a series of video memory access speed tests. Two values are given: MB/s = the memory bandwidth of the video subsystem in megabytes per second; fps = how many times per second a single video page can be filled with a fixed character / attributes pair. This is an ideal condition and represents the maximum fill rate. Both values depend not only on the video card and bus speeds but also on the CPU performance. Keys: ESC = exit r = repeat tests Video modes available --------------------- Name Format Box Resolution 0,1 40x25 8x8 320x200 0*,1* 40x25 8x14 320x350 0m,1m 40x25 8x16 320x400 0+,1+ 40x25 9x16 360x400 2,3 80x25 8x8 640x200 2*,3* 80x25 8x14 640x350 2m,3m 80x25 8x16 640x400 2+,3+ 80x25 9x16 720x400 7 80x25 9x14 720x350 7+ 80x25 9x16 720x400 40x30 8x8 320x240 80x43 8x8 640x350 80x50 9x8 720x400 80x28 9x14 720x400 80x30 8x16 640x480 (multisync monitor only) 80x34 8x14 640x480 (multisync monitor only) 80x60 8x8 640x480 (multisync monitor only) * = EGA enhanced modes m = MCGA enhanced modes + = VGA enhanced modes Modes 0, 2, are identical to modes 1, 3, respectively. On the CGA there is a difference in these modes. In modes 0 and 2 the color burst was turned off (giving only shades of gray) but color burst is not provided by the VGA. Mode hex 3+ is the default mode with an analog color display attached to a VGA system. Mode 7+ is the default mode with an analog monochrome display. Modes 0*, 1*, 2*, and 3* emulate the support provided by the EGA. Modes 0m, 1m, 2m, and 3m emulates the support provided by the MCGA. BEWARE: modes 80x30, 80x34, and 80x60 require a multisync monitor and they may damage very old VGA only 31.5 kHz monitors. All Points Addressable (APA) tests -------------------------------------------------------------------------------- Test card demo -------------- Shows a test card made by a full screen grid with equally spaced lines, a centered circle, a palette, and line patterns. Useful to check the screen aspect ratio. Keys: ESC = exit Circles demo ------------ Shows a bunch of concentric circles that rapidly change their color. FPS indicator also shown. Keys: ESC = exit Lines demo ---------- Shows two lines (green and red) that rotates in opposite directions. In video modes with only one available page the lines could be only partially drawn (it depends on how fast the CPU, bus, and VGA are). FPS indicator also shown. Keys: ESC = exit Palette demo ------------ Fills the screen with the color palette. Keys: ESC = exit Worms demo ---------- Draws a bunch of worms that crawl on the screen. FPS indicator also shown. Keys: ESC = exit Split & Pan demo ---------------- This demo shows the split screen and panning features. Keys: + = increase start address value - = decrease start address value ARROW UP = increase Preset Row Scan value ARROW DOWN = decrease Preset Row Scan value ARROW LEFT = decrease Horizontal Pel Panning value ARROW RIGHT = increase Horizontal Pel Panning value PAGE UP = decrease split screen scanline value PAGE DOWN = increase split screen scanline value M = change Pixel Panning Mode value ESC = exit Scrolling demo -------------- This demo smoothly scrolls two vertical bars horizontally using the AC horizontal pel panning register and the CRTC start address. Keys: + = increase scrolling amount - = decrease scrolling amount / pause ESC = exit Benchmark --------- Performs a series of video memory access speed tests. Two values are given: MB/s = the memory bandwidth of the video subsystem in megabytes per second; fps = how many times per second a single video page can be filled with a fixed color value. This is an ideal condition and represents the maximum fill rate. Both values depend not only on the video card and bus speeds but also on the CPU performance. Keys: ESC = exit r = repeat tests Video modes available --------------------- Name Col. Resolut. Pages Mode 04 4 320x200 1 CGA comp. 06 2 640x200 1 CGA comp. Dh 16 320x200 8 planar Eh 16 640x200 4 planar Fh mono 640x350 2 planar 10h 16 640x350 2 planar 12h 16 640x480 1 planar 13h 256 320x200 1 chain4 256 160x120 13 planar (multisync monitor only) Q 256 256x256 1 chain4 256 296x220 4 planar Y 256 320x200 4 planar X 256 320x240 3 planar 256 320x400 2 planar 256 360x270 2 planar 256 360x360 2 planar 256 360x480 1 planar 256 400x300 2 planar (multisync monitor only) BEWARE: modes 160x120 and 400x300 require a multisync monitor and they can damage very old VGA only 31.5 kHz monitors. LICENSE -------------------------------------------------------------------------------- This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Authors -------------------------------------------------------------------------------- Copyright (C) 2019-2026 Marco Bortolin Portions of code by Robert C. Pendleton and released in the public domain.