TANDY 2500 RSX (250-1620/1621) ACUMOS Video Faxback Doc. # 1891 The video circuitry for your computer is included on the main logic board. This circuitry features: * IBM VGA compatibility plus support for Super VGA modes with 132-column text and both 800 x 600 and 1024 x 768 resolution graphics. * 256KB video memory (RAM), expandable to 512KB to support more Super VGA modes. * A color palette of more than 262,000 possible colors. * compatibility with VGA analog monochrome and color, fixed/multiple- frequency monitors (including 8514/A-compatible monitors). In its default mode, the video supports most software designed for the EGA and/or VGA standard. You must use a VGA analog color or monochrome monitor. The video circuitry is also compatible with software written for these video standards: * VGA (Video Graphics Array). * VESA (Video Electronics Standard Association). * MCGA (Multi-Color Graphics Array). * EGA (Enhanced Graphics Adapter). * CGA (Color/Graphics Adapter). * MDA (Monochrome Display Adapter). The VGA utilities provided with your computer system are ACU.EXE, AVGA2CFG.COM, and SETMODE.EXE. Use ACU.EXE and AVGA2CFG.COM to change the video refresh rate, or the rate at which screen updates are made to the display. Use SETMODE.EXE to choose from the standard and super VGA modes your video circuitry supports. Using ACU.EXE: To run the ACU.EXE program, follow these steps: 1. Insert the Utilities diskette into Drive A, and type: copy a:\acu.exe c:\ and press . The ACU.EXE file is copied to the root directory of Drive C. 2. Next, type: copy a:\avga2cfg.com c:\ and press . The AVGA2CFG.COM file is copied to the root directory of the hard drive. 3. To start ACU.EXE, type acu and press . Use the up and down arrow keys to select the desired screen mode. For each screen mode listed, use the mouse or the left and right arrow keys to select a refresh rate. To preview a mode, press of click on the preview button with the mouse. To return from the preview mode, press the ESC key or click the left mouse button. After making your selections, use the mouse or the arrow keys to select EXIT TO DOS. Then, click the left mouse button or press . The three options are displayed. You can: * return to the program by typing c to cancel. * exit without updating by typing n for no. * exit and save settings by typing y for yes. Using AVGA2CFG.COM: The selections you make with ACU.EXE are saved in the file AVGA2CFG.COM. If you are using the AVGA2CFG feature, run the AVGA2CFG file each time you start your system. To run the file from the MS-DOS command line, type AVGA2CFG and press . To run the file automatically, add the following line to the AUTOEXEC.BAT file. Using SETMODE.EXE: Insert the Utilities diskette into Drive A and type: copy a:\setmod.exe c:\ and press to copy SETMODE to the root directory of Drive C. Use SETMODE.EXE to set the various standard and super VGA mods of your Acumos video chip. Enter the SETMODE command at the MS-DOS prompt in one of two ways: * If you do not know the number of the mode you want to use, type setmode and press . Select from the video configurations that are displayed. * If you know the number of the mode you want to use, type setmode nn and press . (nn is the number of the mode desired.) Check your monitor documentation to determine which modes your monitor supports. If you run SETMODE without specifying a mode number, choose from one of the displayed video modes by using the mouse or arrow keys and pressing s. Following are samples of displayed modes: Mode Resolution (1) Monitor(s) Supported 54 (3) 132-column x 43-line text color, multiple-frequency 55 (3) 132-column x 25-line text color, multiple-frequency 56 (3) 132-column x 43-line text mono, multiple-frequency 57 (3) 132-column x 25-line text mono, multiple-frequency 5F (2) 640 x 480, 256-color graphics color, multiple-frequency 58 800 x 600, 16-color graphics multiple-frequency 5C (2) 800 x 600, 256-color graphics multiple-frequency 5D (2) 1024 x 768, 16-color graphics color, multiple-frequency, 8514/A (1) Resolution is listed as columns x rows for text modes or as dots vertical x dots horizontal with the number of available colors for graphics modes. (2) Requires 512KB of video memory. (3) If you select 132-column text, 60 Hz, 2 fonts mode on the ACU screen, your monitor will not operate properly. Note: Type h to display help from the SETMODE screen.