APPLESOFT II BASIC is APPLE’s very much extended BASIC language. BASIC has BASIC Programming Manual can provide an introduction: it covers a. Apple II Programmer’s Reference: Applesoft Commands · Applesoft BASIC Frequently Chart, in PDF format · Applesoft Basic Programming Reference Manual. Download as PDF, TXT or read online from Scribd. Flag for inappropriate content. Save. Applesoft ][ Basic Programming Reference Manual. For Later. save.
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However, there are only 16 different colors, usually numbered from through The first time through, only the first character will be printed; the second time the first two characters will be printed, etc. The origin 0,0 for all graphics is in the upper left corner of the screen. The next statement in the program is a STOP statement.
Characters above the cursor, and characters to the left of the cursor in its printing line will not be affected.
A character occupies the space of two low-resolution graphics dots stacked vertically. If many faultes in this book you fynde, Yet think not the correctors blynde; If Argos heere hymselfe had beene He should perchance not all have seene. If var is a svar, then no? A string which contains characters is called a “null” string.
May also draw random “shapes” all over the high-resolution graphics areas of memory, possibly destroying your program, even if you are not in graphics mode. And a move of in section A will end your shape definition unless there is a 1-bit somewhere in section B or C. Errors in a deferred-execution statement are not detected until that statement is executed- The following are the possible error codes and their meanings.
Full text of “Applesoft BASIC Programming Reference Manual – Apple Computer”
If VTAB moves the cursor to a line below the text window, all subsequent printing takes place on that line. You cannot use these words as variable names or as part of any variable name.
When more than one line is to be listed. USR 3 This function passes its argument to a machine-language subroutine. The DEFinition’s real avar need not appear In aexprl. Suppose we wanted Co count backwards from 10 to 1. A name does not have Co be separated froin a preceding or following reserved word by any of these delimiters. This Is followed by the decimal point mankal then the other eight digits of the mantissa.
If a deferred-execution FOR statement progrmming still in effect, an immediate-execution NEXT statement can cause a jump to the deferred-execution program, where appropriate. If the first digit is a one, and the second digit is less than reeference equal to six, numbers with 39 digits may be used without getting an error message. Out of range values will cause the message? In a variable name, any alphanumeric characters after the first two are ignored unless they contain a “reserved word.
Applesoft BASIC Reference
The arithmetic expressions which form the parameters of the FOR loop may be reals, real variables, Integers, or integer variables. Alphabetic Glossary of Syntactic Definitions and Abbreviations See Chapter 2 for a logical as opposed to alphabetic presentation of these definitions. Be careful that you list the NEXT variables in the right order, though, to avoid crossed loops. As discussed below, the amount of space allocated for the elements of an array depends upon the type of array.
All characters, including statement separators and blanks may be included. The typed responses may be separated by commas or returns.
Type any value you wish. Equivalent positive and negative values may be used interchangeably.
HTAB’s moves are relative to the left margin of the text window, but Independent of the line width. To force LIST to abandon formatting with extra spaces, clear the screen and reduce the text window to width 33 maximum: Typing TEXT returns you to the normal text mode.
Applesoft BASIC Programming Reference Manual – Apple Computer
Ctrl C is treated as any other character if it is not the first character typed. If you are sure there is enough safe aplpesoft above location to hold your shape table, there is nothing to worry about.
They are the escape key, marked Proggamming, the repeat key, marked REPT, and the left- and right-arrow keys, which are marked with a left arrow and a right arrow. Extra data left unread is OK. Use reset Ctrl C return to recover. Zeroes all variables, arrays and strings. I liked it, but now it is out of date to today’s computers.
But you can get into trouble assigning the null string to a string variable, as discussed in Chapter 7 under the IF statement. For this example, we’ll use hexadecimal address IDFC. Recede the vector information into a series of hexadecimal bytes, using the hexadecimal codes from Figure 3. For instance, ZI could be substituted everywhere there is an N in the above program and it would function exactly the same.
Note the use of REM statements for clarity.