titus-larsen-titus-1981-apple-interfacing

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the input port. VVhen these ports have been constructed and go on to the next step. Step 2 The test configuration for an SN7400 NAND-gate package is showfl' in Fig. 6-16, For the pin configuration of other chips, we refer you to Fig. 6-17. lA 18 1Y 2A 28 2Y GND 1Y lA 18 2Y 2A 28 GND SN740!l SN7402 lA 18 2A 28 2C 2Y GND Sl\!7410 4B 4A 4V 38 JA 3V 1A 18 1Y 2A 2B 2Y GND Sl\!7430 S!\17486 Wire the test circuit as shown in Fig. 6-16. Remember to connect the +5-volt and ground inputs to both the interface chips and to the circuit that is to be tested. The unused inputs at the input port should be grounded.
Yo'1 should be able to develop the truth tables for the various . gates shown in Fig. 6-17, starting with the NAND gate. For a twogate, there are only four combinations of inputs. How many ,.t;viuc, .... _.,,,. '"'·v-- would there be for four gates in a single integrated package Possibly you said 16 combinations, four for each of the four gates, 256 combinations, the number possible with eight binary inputs. there are only four meaningful combinations, since all of gates are tested at the same time. Knowing that one gate is bad one particular combination of inputs does not serve much pur If one gate is bad, then the entire "package" is bad. What are the four combinations of eight bits that will be used at output port to test the NAND gate You should write down both ···.
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lJ. 21862 APPLE® INTERFACING JONAT
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APPLE® INTERFACING by Jonathan A.
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Preface The purpose in writing this
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make no attempt to provide much det
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Contents CHAPTER 1 6502 PROCESSOR 9
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CHAPTER 1 6502 Processor The Apple
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Fig. 1- 1. 6502 Microprocessor chip
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locate the memory "cell" that is to
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IR.,view At this point, you should
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Gei'!eral-fi!Jrp@S('; I/ 0 Commaru:
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of an examined memory location. Fro
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will now explore the actions that e
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transfers will require more than ei
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grams are probably easier to write
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·when the Apple computer is progrn
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Y@bie ::!1. VNth i
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DECODED OUTPUT puter systems, the R
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1 1 1 Using Decoders In many cases,
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used in PEEK commands, for example
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An alternate approach is to use bot
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sections, but the address inputs, A
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fUNCTlON TABLES COMPARING CASCADING
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flexible decoding scheme, as shown
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until the power is turned off. Ther
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the logic zero state. In most cases
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ue in sequence (in binary), 255, 25
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DATA BUS DATA A SN74125 DATA B DATA
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R gates that control the enabling o
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state of the unused bits cannot be
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CHAPTER 4 Flags and Decisions n alm
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VALUE 00111010 00011010 11110000 00
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•• Addrss Byte Da;a Syie Mexacl
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INPUT DEVICE RD 49321 - READY/BUSY
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INPUT DEVICE INPUT PORT Dl Dl ' D3
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y-language programming will also be
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CHAPTER 5 Breadboarding 01 With the
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5 IN4001 (4) 6 ,.___'-'' N:...J LM3
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A15 AIO A13 Al2 Al4 All A9 AfJ D .L
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In the memory address mode, must pl
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PIN CONFIGURATION DJ, LOGIC DIAGRAM
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The actual ORing of these control s
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Fig. 5·10. Packaged version of the
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SIGNAL APPLE PfN INTERFACE PIN +12V
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·.chips have rather slow access ti
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are possible, we think that one exp
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in most of the experiments unless o
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tep 3 You may wish to test other po
Page 95 and 96: ,..,,.,....,"'"' in the block from
Page 97 and 98: None of the outputs should be activ
Page 99 and 100: ---" 2 CLR 20 2 CK Si\17474 The dev
Page 101 and 102: entered and run, It first asks you
Page 103 and 104: +5 Gl\ID LOGIC SWITCHES A B c D 16
Page 105 and 106: PR INT "O"; GOTO 65 If you wish to
Page 107 and 108: am, and the two-byte decimal calcul
Page 109 and 110: for each value that is input to the
Page 111 and 112: of the monitor screen each time the
Page 113 and 114: A = 128 420 B = PEEK(493 l 9) 430 F
Page 115 and 116: il!!lie -2. 0 THEN . . .
Page 117 and 118: program. You may forgotten steps to
Page 119 and 120: The A output, RD 49319, has already
Page 121 and 122: used the following program: FOR A =
Page 123 and 124: · numbers would have to be "split"
Page 125 and 126: tep 1 The input port and output por
Page 127 and 128: 0'"""c"y'·i- the relative values t
Page 129 and 130: and output ports are simply additio
Page 131 and 132: e has been divided into 256 values,
Page 133 and 134: e converter will not burn out, sinc
Page 135 and 136: 07 DATA BUS DO 3 4 7 a 13 14 17 18
Page 137 and 138: each decade. The bed code is used i
Page 139 and 140: LED BIT RED } D3 YELLOW EL M D4 GRE
Page 141 and 142: : : FOR T = 0 TO 770 NEX T T NEX T
Page 143 and 144: Thus, by testing the value input fr
Page 145: he six LEDs should be removed from
Page 149 and 150: INPUT "LAST TWO DIGITS ";A$ IF A$ =
Page 151 and 152: tfhe program first tests the reset
Page 153 and 154: would you program the computer so t
Page 155 and 156: Yes. Simply reverse the commands at
Page 157 and 158: · computer to measure analog volta
Page 159 and 160: he minimum value should be in the r
Page 161 and 162: 130 Y2 = PEEK(49319)/ 1.594 140 HPL
Page 163 and 164: You probably will not see much chan
Page 165 and 166: D7 D6 D5 D4 D3 D2 Dl DO 'b- • "A"
Page 167 and 168: ll'i!i Name 1 1/0 SELECT 2- 17 A 15
Page 169 and 170: ADDRESS BUS A7-AO :> MEMORY 256 x 8
Page 171 and 172: !n!erfac" Slel Addwess lta"%Je 0 C0
Page 173 and 174: 28 INT IN SLOT 6 +5 lK Lr LOCAL INT
Page 175 and 176: USER 1 This input will allow you to
Page 177 and 178: puts. You must be careful in your d
Page 179 and 180: CONTROL/ DATA input at pin 12 ( C/D
Page 181 and 182: 93427 OR EQUIV ROM ADDRESS BUS 1---
Page 183 and 184: use of red LEDs is recommended, sin
Page 185 and 186: APPENDIX B Parts Required for the E
Page 187 and 188: APPENDIX 6502 Microprocessor Techni
Page 189 and 190: MC§f.500 IE1lriy {D"i) This input
Page 191 and 192: MCS6500 INSTilUCTION SH-ALPHABETICA
Page 193 and 194: ,, ,, T!M!NG Il-01! READING DI\ TA
Page 195 and 196: MCS0t-20 PWH¢01 ns PWH¢2 ¢11ou11
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APPENDIX D Apple Interface Breadboa
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APPENDIX E Printed-Circuit Board Ar
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!'i9. E-2. Printecl-
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F t • I +: a... :::> 0 a: (!> 0 (
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Controllers, 14 Converter analog-to
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Pin configuration-cont SN7474, 150
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The Blacksburg Group According to B
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