User manual EPSON T-750

[. . . ] User's Manual FCC COMPLIANCE STATEMENT FOR AMERICAN USERS This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient the receiving antenna - Relocate the printer with respect to the receiver - Plug the printer into a different outlet so that the printer and receiver are on different branch circuits. [. . . ] Graphics modes *Adjacent dots cannot be printed in this mode. Modes 4-7 in the table are special modes that alter the horizontal density to give proportions of a computer monitor (the CRT modes), or to match the vertical density so as to give round circles (the plotter modes). In two modes, high-speed double-density and quadruple-density, the print head cannot print two consecutive dots with the same pin, so that it can print dots in only half the possible dot positions in any one row. The higher density means that the resolution of the pattern is better than in single-density mode. When you design patterns in these two modes, however, you must see that no dots overlap. Reassigning a graphics mode Another graphics command lets you assign a different eight-pin graphics mode to one of the specific eight-pin graphics commands. You can use it with graphics software programs to quickly change the density and proportions of your printouts. Changing the graphics option changes the width without changing the height. The command for reassigning a graphics mode is ESC ?In this command, c is a letter designating one of the four alternate graphics codes (K, L, Y, or Z) and m is the mode number of the new mode, as listed in Table 5-1. For example, to change the ESC K command to select the CRT I screen graphics mode, the command in BASIC would be the following: LPRINT CHR$(27);"?K";CHR$(4); Graphics and User-defined Characters 5-9 A little experimentation should tell you whether the reassigning code can improve your graphics printouts. Designing Your Own Graphics This section takes you through the development of a graphics program. The example is not especially complicated, but it does include the same steps you would use for a more complex figure. You should plan your figure with dots on graph paper, but before beginning to place the dots, you must decide which graphics density you want. Figure 5-2 shows the differences between three common modes so that you can choose the one you want. In this figure you can see the main rules for graphic design in the three densities: l l In single-density no dots can be placed on vertical lines. In high-speed double-density, dots can be placed on vertical lines, but no dots can overlap. In low-speed double-density, dots can be placed on vertical lines, and they can overlap. l Figure 5-2. Designing in different densities I Single High-speed double Low-speed double 5-10 Graphics and User-defined Characters Now look at the high-speed double-density design in Figure 5-3. It should point you in the right direction for your own work. Figure 5-3. Arrow design After plotting the dots on a grid, you calculate the numbers for each pin pattern by dividing the design grid into separate print lines. For the arrow design, the grid was divided into two lines, each seven dots high. Then each column was examined to calculate the graphics data. The results for the first line are shown in Figure 5-4. The pin values are on the left and the sums at the bottom of each column. Figure 5-4. [. . . ] For example, a capital W receives much more space than a lowercase i. The result looks more like a typeset book than a typewritten draft. pull tractor A detachable device that moves continuous paper through the printer. RAM Random Access Memory. The portion of the printer's memory used as a buffer and for storing user-defined characters. All data stored in RAM is lost when the printer is turned off. [. . . ]