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SECTION 1: INTRODUCTION TO THE DODSON HYDRAULICS LIBRARY <br /> 1.6.4.2 Required Hardware for Screen Graphics <br /> The DODSON HYDRAULICS LIBRARY programs can display graphs using the IBM Color <br /> Graphics Adaptor (IBM CGA) or the Hercules Monochrome Graphics Adaptor (MGA) . <br /> Many other screen graphics adapters are compatible with the IBM CGA and/or the <br /> Hercules MGA, and thus work well with the DODSON HYDRAULICS LIBRARY programs. <br /> If your computer system has an IBM CGA or compatible adaptor, the graph will <br /> be displayed with a resolution of 640 by 200. The Hercules MGA has a <br /> resolution of 720 by 348. Therefore, the Hercules card provides a better <br /> quality graph. <br /> When you choose to display your graph on the screen, the DODSON HYDRAULICS <br /> LIBRARY programs automatically checks to see which screen graphics adaptor is <br /> installed in your system. If the program cannot find a screen graphics <br /> adaptor, a message to that effect is displayed. <br /> 1.6.4.3 Plotting a Graph on the Printer <br /> If your computer has the capability to display graphs on the computer screen, <br /> as described in the previous section, then you may also be able to plot graphs <br /> on your dot-matrix printer. Simply press the "P" key (without the quotes) when <br /> the following message is displayed: <br /> <Enter>: Repeat, <R>eport, <S>creen Graph, <P>rint Graph, or <Esc>: End <br /> The graph will be drawn on the computer screen, and then the image will be <br /> "dumped" to your dot-matrix printer. Several minutes may be required for the <br /> graph to print. After the graph has been printed, you can continue by pressing <br /> any key. The graph will be cleared from the screen, and the message shown <br /> above will be displayed again. The following section shows an example graph <br /> printed on an Epson MX-80 printer. The graph produced by your printer may vary <br /> in size or shape. <br /> If you have problems in printing, or if your computer "hangs up" when you try <br /> to print, then check to make sure your printer is turned on and is "on line" . <br /> You should also make sure that your computer knows how your printer is <br /> connected. Your computer expects the printer to be connected to parallel port <br /> 1, unless you put a command in the AUTOEXEC.BAT file to tell it otherwise. <br /> Check the section of your DOS manual concerning the "MODE" command for more <br /> details. If you continue to have problems, then read the following section <br /> carefully to be sure that you printer is compatible within the programs. <br /> DODSON & ASSOCIATES, INC. THE DODSON HYDRAULICS LIBRARY, PAGE 8 <br />