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

30 APPLE II COMPUTER GRAPHICS4. Write a BASIC program which plots several blocks or lines on theLow-Res screen, and then clears that screen by CALLing the ROMroutine located at $F832.5. Write a BASIC program which prints, on line 5 of the text screen, amessage of your choice in the inverse mode, and then pri nts, onscreen line 10, a second message in the normal mode. Do not use theVTAB, INVERSE, or NORMAL commands, but instead use the POKEand CALL commands. The VTAB location is discussed in the POKEsection of this chapter, and the ROM routines to set the INVERSE andNORMAL modes are located at $FE80 and $FE84, respectively.)