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

GlossaryA particular number that corresponds to each byte of mem­ADDRESS.ory.ANIMATE.To make an object seem alive, to cause it to move about.ASCII. American Standard Code fo r Info rmation Interchange; all thenumbers and letters used on a computer are assigned numeric values.See page 138 of the APPLESOFT Reference Manual.BINARY. A system of numeration having only two characters, (/) and 1.Any number may be represented using multiple digits. For example,decimal 3 is binary 11 and decimal 5 is binary 101. Binary fi les are fi lesstored in binary fo rm.BIT. The fu ndamental unit of memory in a computer. A bit can be in oneof two states-a high or low voltage. It is normally represented as either1 or 0.BLOAD.The command to load a binary fi le from disk or tape.BOX METHOD. A method of detecting collisions where you considerany shape entering a region around the target defi ned by a range of X­coordinates, and a range of Y-coord inates, to coll ide with a target.BSAVE.BUFFER.The command used to save a binary fi le on disk or tape.A temporary storage area.BYTE. A unit of info rmation in memory made up of eight bits. For example,in binary, 11 (/)1 01 11; in hexadecimal B7. A byte may contain anyvalue between (/) and 255 decimal, inclusive.BYTE-MOVE. An animation technique in which the digitized shape isstored in memory and then moved into Hi-Res memory fo r display.CALL. A BASIC statement similar to GOSUB, except it executes amachine-level routine as opposed to a BASIC routine.CLASHING. The result of trying to plot colors from diffe rent color groupstogether in the same byte of memory. The results of clashing are unpredictablecolors.COLLISION.In animation, when one shape runs into another.COLLISION FLAG. A value which is set by your routine to signal that acollision has occurred.COLOR BIT. The high-order (left-most) bit in a byte of the Hi-Res screenmemory. The color bit determines to which of the two color groups thebyte belongs to.181