williams-et-al-1983-apple-ii-computer-graphics

396Text and Low-ResObjectivesAfter reading Chapter 6 you should be able to:• Convert any pair of Low-Res colors into the corresponding value, bothdecimal and hex.• Place any letter or pair of blocks at any given location on the Text orLow-Res screens, and do so using both Monitor and the POKE statement.• Use the Low-Res editor to develop figures.• Save the Low-Res screen using BSAVE or the Monitor WRITE command.Although many programmers have an aversion to graphics in the Low­Res mode, a number of respectable programs have employed Low-Reswith success. The "Little Brick Out" (on your DOS 3.3 system master) and"Lemonade" games are good examples of what can be done with Low-Resand a little imagination. We will demonstrate how the Text andLow-Res modes work, and how you may easily create and display Text andLow-Res figures.Let's begin our exploration of Low-Res graphics by examining the Textmode a bit closer.TextTo start with, type in Listing 6-1, which is designed to fill the screen with