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

IndexAddition, 168-1 7 2Address(es), negative, 173-1 74Addressing, 6-7ALTC HARSET, 36, 37Animation, 13Sbyte-move, see Byte-move processflicker in, 1 SSAPPLE EXC., S7, S8Apple screen characters, 17 StAPPLE TEXT, use, 112, 113APPLESOFT extensions, 21-30ASC II character codes, 32, 176tBar graph, creating of, 119-1 2 3BAS IC, memory move, S9f-60fBinary, 3, 163ad ding and subtracting, 170-1 72conversion of decimal to, 166-1 67conversion to decimal, 166difficulties in, 7Binary/ hex chart, 8f, 9Binary/ hex examples, 9, 9fBinary numberconversion of decimal to, 1 68writing of, 9Binary nibble, 9Bit(s) , 4, S, 171color, 82-84, 92, 96co mbinations, Sf, S, 6Hi-Res, 68, 69dot correspondence to, 69fpatterns, 6value of, S-6BLOAD command, S 1 , 116Blocks, plotting and erasing, 48-49BSAVE command, use, S1, S3, 106, 107Byte(s), 6, 171ad dress of, 6-7divisions, for vector encoding, 102f,102, 103-1 04, 10Svalue of, 8, 9, 162changing of, 14, 1 SByte-move process, 13S-1 36, 1 SOanimation by, 136-1 38altering of, 138-1 39for horizontal animation, 1 39-142two-byte animation, 142-1 4SByte-move shapes, pre-shifting with, 1 S4Calculation, 149-1 S1CALL command, use, 21, 24-26in memory move, 60Character codesApple screen, 1 7StASCII, 176tCircle graphs, 129-1 32Circuits, 4Clashing, 9S-9680 COL, 36Collision, detecting of, 1S7, 1 S8-1 64Colon, use, 1 SColorHi-Res, 81-96selection of, 123Color bit, 92, 96for Hi-Res graphics, 82-84fColor codes, Low- Res, 44fCommand(s), 2, 19Command extensions, 21Complements, forming of, 172-1 73Computer, physiology, 3-1 1CTRL-C, 6, 27, 1 S9Cursormovement, so, sotpositioning of, 123Data, SSdisplaying of, 119Data file, ss-s 7Data processing, 119DATA statements, 119, 137Decimal, 3conversion of, to hex, 167-1 68convers ion to, 9, 10of binary, 166-1 67, 168of numbers, 16S-1 66Digit(s), position within numbers ' 16SDigital, digressing to, 4Digitizing, 99, 100, 109, 116Dithering, 81, 93, 943DOG command, 19DOS, 1S, 16, 18Dot(s)Hi-Res, 6S, 67, 68, 69-78double dot picture, 92, 92fquantity available, 91-93isolating of, 162patterns, POKEing of, 149plotting of, 109-1 1 Oprocessing of, 90shape plotting and, 100, 101, 103Draw, use of, 10S-1 06DRAW command, 1 08, 113, 114, 116, 13S186