Reply to this topic; Start new topic; Recommended Posts. Join 350,000 subscribers and get a daily digest of news, geek trivia, and our feature articles. Since we launched in 2006, our articles have been read more than 1 billion times. The program will ask you for input with a question mark ( ? All Rights Reserved, At any time while programming, you can see the contents of your program by typing the, To start a new program (erasing the current program from memory), type. This will BREAK the program, interrupting its execution. Note that string comparisons are case sensitive, and normal ASCII order is used. filled with spaces), and the third only if columns 24-32 are empty. Subsequent reads will read from the VFS. BASIC example: Euclidean algorithm for finding the Greatest Common Divisor. You can make multidimensional arrays by specifying them in the DIM; a 3x3x3 integer array can be created by doing 'DIM B%(2,2,2)'. The page attempts to emulate an Apple II keyboard. After opening, you need to speficy whether the file is to be read or written to. Of course, if you have a real Apple II, you can follow along, as well. [Each row takes 40 bytes, so after 3 rows, there's 8 unused bytes to make it an even 128 bytes]. Deferred execution. Their roles in the program may or may not have been apparent at the time, but, as they're so vital to the BASIC language, they will be discussed here. For floating-point values, scientific notation is used for values with absolute value less than 0.01 or if there are more than 9 digits in front of the decimal point. Simply re-type the offending line, double-checking for possible typos. So, how does this program work? With that, Applesoft could be entered in lowercase, but everything except for strings which remained untouched would be uppercased. Consequently, it lacks a number of command features developed for the later, mainstream version: 'CATALOG' (case sensitive) under DOS 3.3 will show a listing of all files. The command 'NEW' clears out any Applesoft program in memory and clears the contents of all variables; it is not easily undoable. For example FOR I = S TO P doesn't collapse into FOR I = STOP. If the returned value is <127, it's being pressed or is not connected. Next, a pair of bytes hold 14 pixels horizontally, with the high bits in each not counting as pixels. Use '$' to specify a string (255 characters maximum), or '%' for an integer (16 bits, with range -32767 to 32767). There’s also this handy quick reference of Applesoft BASIC commands. The Apple II was a stunning breakout success for Apple. This page was last modified on 3 April 2015, at 19:06. Type your name and press Enter (Return) to answer the question. Beyond the name overhead, array Integer variables use 2 bytes of memory each, reals 5. The subscript is converted to an integer value on accessing, as the above example shows. operator, with POKE 32,n ... POKE 37,n. The Due to the size of the input buffer, a single line of the program is limited to 255 characters. It is legal to modify the loop variable in the middle of a loop. The size does not need to be a constant in the code-- you can do 'A%=50: DIM B(A%)'. Each one may contain multiple pieces of text, but the text in them should not go over the length, or you will write into the next record. Here's a brief list of Applesoft, Integer The 'POP' statement cancels the last return address, and continues on to the next statement. Also, for string to number coverstions, there is 'var$=STR$(expr)' (converts number to string form) and 'val=VAL(expr$)' (converts first number found in string to numeric value). [Since the screens are in the same memory location, you can use Lores graphics commands to put stuff on your screen. Subject: Applesoft BASIC Frequently Asked Questions (FAQ), Archive-name: apple2/asoft 'STOP' halts the currently running program with a message; you can use 'CONT' from the prompt to attempt to restart where you left off. 1 D$=CHR$(4): PRINT D$"OPEN ASOFT.LISTING": PRINT D$"WRITE ASOFT.LISTING" : POKE 33,32: LIST : PRINT D$"CLOSE": TEXT: END. GOSUBs can be nested up to about 12 or 16 deep, so recursion should be avoided if possible. These three types are independent-- assigning to NM% will not affect NM$ or NM. Operators have the following precedence; things within the same precedence level are evaluated left to right: Applesoft is somewhat concerned about variable types-- if you try and directly assign a string to a number or vice versa, it'll stop and complain. 'RUN' starts the current program after clearing the contents of all variables, starting at the lowest numbered line, and continues until 'STOP', 'END', flow of execution reaches the end of the code, or an unhandled error is encoutered.

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