Get Apple machine language PDF

By Don Inman

ISBN-10: 0835902307

ISBN-13: 9780835902304

ISBN-10: 0835902315

ISBN-13: 9780835902311

For those who already recognize easy and feature entry to 1 of the preferred Apple types, you are in your method to constructing genuine services at the topic. The ebook combines colour, photos, and sound with straight forward demonstrations that will help you learn-FAST. you are going to initiate easily, utilizing easy statements like POKE, PEEK< and get in touch with to go into and execute computing device language courses. Then you are going to increase a easy working method, coming into and executing your laptop language courses from there. the next move may have you utilizing an Apple approach computer screen to application without delay and retailer the time often had to interpret simple statements. ultimately, you are going to the best way to use the Apple Mini-Assembler to prevent the problematic information concerned with direct computing device language programming. All in a number of, quickly stages-you'll be stunned at how easy it's!

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Sample text

Line 2030 initializes counters J to 0 and I to 19 so that 20 addresses and data values will be displayed on the screen by the FOR-NEXT loop at lines 2200 through 2220. SECTION 6B 2000 REM * SUBROUTINE TO DISPLAY PROGRAM * 2010 HOME: PRINT "HERE IS YOUR PROGRAM" 2020 PRINT 2030J=0: 1=19 2040 ON INT((B-1 )/20)+1 GOTO 2090, 2080, 2070, 2060, 2050 2050 GOSUB 2200 2060 GOSUB 2200 2070 GOSUB 2200 2080 GOSUB 2200 2090 I=B-1 :GOSUB 2200 2100 RETURN 2200 2210 2220 2230 2240 2250 2260 HOME FOR E = J TO I PRINT S+E; SPC(2);: GOSUB 3000 NEXT E PRINT "PRESS ANY KEY TO CONTINUE": GET A$ J=I+1 : 1=1+20 RETURN Line 2040 uses the number of program bytes to calculate how many blocks of 20 lines must be displayed.

Instructions must be in machine language code before the computer can understand them. Enter BASIC here Translate to machine language Take action Once the BASIC statements have been interpreted, the computer acts on them. Its actions and the results it obtains must be translated once more into a form which BASIC can use and which you will be able to understand easily. (cOMPUTE' ~- Action and results in machine language Translated to a form that you and BASIC can "read" 22 Output Translating BASIC is a time-consuming chore for the interpreter, and it is wasteful of computer time.

35 Example: Olde Myth HERE IS YOUR PROGRAM I I To err is human 768 89 769 13 Do you see the errors? 770 8C New Myth 771 25 772 03 773 60 Computers never err PRESS ANY KEY TO CONTINUE- I I You spot the errors and want to make changes. Press any key. HERE IS YOUR PROGRAM first change - second change- 768 89 769 13 770 8C 771 25 772 03 773 60 PRESS ANY KEY TO CONTINUE .. 768 You typed the address 768 DAT A=? A9 "II Then the data ANY OTHER CHANGES (YES OR NO)? NO __ You typed NO The screen then goes blank, and the corrected program is shown.

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Apple machine language by Don Inman


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