Don Inman's Apple machine language PDF

By Don Inman

ISBN-10: 0835902307

ISBN-13: 9780835902304

ISBN-10: 0835902315

ISBN-13: 9780835902311

In the event you already be aware of simple and feature entry to at least one of the preferred Apple versions, you are in your approach to constructing actual services at the topic. The publication combines colour, images, and sound with uncomplicated demonstrations that will help you learn-FAST. you are going to initiate easily, utilizing easy statements like POKE, PEEK< and phone to go into and execute computer language courses. Then you will improve a easy working method, coming into and executing your computing device language courses from there. your next step can have you utilizing an Apple process visual display unit to software without delay and retailer the time frequently had to interpret easy statements. ultimately, you will use the Apple Mini-Assembler to prevent the difficult info concerned with direct computer language programming. All in a number of, quickly stages-you'll be stunned at how basic it truly is!

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Extra info for Apple machine language

Example text

It is converted to decimal form by the subroutine at line 1000 and entered into memory by line 530. Example: No changes to be made after the program is printed. ~------------ We typed 99 here - no changes. The program would then be executed. - - - - - Error seen here Oh,Oh! 769 13 770 80 771 25 772 03 773 60 PRESS ANY KEY TO CONTINUE We pressed a key here after I F ANY CHANGES-TYPE ADDRESS spotting the error. ~-------- We typed the address 768 OAT A=? ,ct;on to '" what happ,n, now. ~ Fourth More than one change may be necessary.

C$ 650 IF LEFT$(C$,1) = "Y" THEN GOTO 420 700 REM * EXECUTE THE MACHINE LANGUAGE PROGRAM * 710 PRINT "PRESS ANY KEY TO RUN": GET A$ 800 CALL S 900 END 1000 REM *CONVERT HEX TO DECIMAL * 1010 M=ASC(H$): N=ASC(U$) 1020 IF M>57 THEN M=M-55: GOTO 1040 1030 M=M-48 1040 IF N>57 THEN N=N-55: GOTO 1060 1050 N=N-48 1060 D=16*M+N 1070 RETURN 2000 REM * SUBROUTINE TO DISPLAY PROGRAM * 2010 HOME: PRINT "HERE IS YOUR PROGRAM" 2020 PRINT 2030J=0: 1=19 2040 ON INT((B-l )/20)+1 GOTO 2090,2080,2070,2060,2050 2050 GOSUB 2200 2060 GOSUB 2200 2070 GOSUB 2200 2080 GOSUB 2200 2090 I=B-l: 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+l : 1=1+20 RETURN 43 3000 3010 3020 3030 3040 3050 3060 3070 3080 REM * CHANGE TO ASCII AND DISPLAY * Y = PEEK(S+E) H = INT(Y/16) U = Y-16*H IF H<10 THEN PRINT H;: GOTO 3060 PRINT CHR$(H+55); IF U<10 THEN PRINT U: GOTO 3080 PRINT CHR$(U+55) RETURN EXERCISES 1.

NOT RACE 3. a. b. c. 4. a. LET A = 5 (or just plain A=5) INPUT A READ A TEXT b. HOME 5. ( ) NOT *, / >= AND 6. 768 769 770 771 772 19 16 14 15 18 7. ( 18 8. 160 CALL 768 21 Chapter 2 Crossing the Bridge BOS When you communicate with the computer in BASIC, you are talking through an interpreter. Each program line must be examined in detail by the interpreter and translated into a code which the computer can understand. It is easy for you to write programs in BASIC, but it is a "foreign" language to the computer.

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Apple machine language by Don Inman

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