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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Although expr is just used to hold the parentheses apart, it referwnce evaluated, so it should not be something illegal. If you have a variable T which is used to hold a temporary result in one part of the program and you need a temporary variable later in your program, use it again.
DEL 1-b ignored, even if the program’s smallest line number is zero. NEXT loops must not “cross” each other.
Applesoft BASIC Reference
I’OK GI Returns the current horizontal position of the cursor- This is a number from at the left margin to 39 at the right margin.
This results in bqsic false assertion at line 40, the THEN portion is therefore ignored, and since there are no further statements the program stops.
This causes the program to stop execution at line In immediate-execution mode, an instruction must be typed without a line number. The example returns 3. If the indicated linenum does not correspond to an existing program line, the error message? When an error occurs in an immediate-execution statement, no line number Is printed.
An attempt to READ more data than the data list contains produces the message: Learn more about Amazon Prime. Typing TEXT returns you to the normal text mode. LISTQ lists the entire program, then gives the?
For each point plotted, the color is the complement of the color already existing at that point. Now try the following program for comparing two numbers remember to type NEW first, to delete your last program: Language program appreciated and Apple style publication too. A string may contain a maximum basuc characters. In particular, string data is stored at the top of memory; on small memory systems 16K or 20K this data may reside in page 1 of high-resolution graphics.
Any further digits are rounded off. This is true even if most of the reerence are trailing zeros, as in 2 U. Use reset Ctrl C return to recover. Try typing the following lines: In this mode, you are plotting points on a grid that is x-positions wide by y-positions high.
Depending on the settings of the other switches, this may cause the display to change from high-resolution graphics page 1 to low-resolution graphics page 1, from high-resolution progra,ming page 2 to low-resolution graphics page 2, or in text mode may cause no change in the display.
SCRN is parsed as a reserved word only if the next non-space character is a left parenthesis. The program tried to read too much appleeoft or insufficient data was Included in the program. We’ve added a space betvreen some lines to make the program easier to read. In the left arrow See “arrow keys”. HTAB can also move the cursor outside the window, but only long enough to print one character there.
One or more such shape definitions, with their Index, make up a “shape table” that can be created from the keyboard and saved on disk or cassette tape for future use. The number of places to the right of the decimal point may be set by rounding off the value prior to PRINTing it. Before going back to line 10 for another guess, we need to make the READ begin with the first piece of data again.
HGR 2 Sets full-screen high-resolution graphics mode by Array subscripts always start at 0; therefore, in the above example nanual have allowed for 16 numbers In array A.
DEL a,-b ignored if a is not zero and if a is less than or equal to the program’s smallest refrrence number. A character occupies the space of two low-resolution graphics dots stacked vertically.
Applesoft BASIC Programming Reference Manual – Apple Computer
Each byte can represent up to three plotting vectors, one in section A, one in section B, and a third a move only in section C. They may be programmlng in either immediate or deferred execution. THEN statement does just that. Provides an easy way to erase: The next statement in the program is a STOP statement. When a byte that contains all zeros is reached, the shape definition is complete.
In the example, is returned. In the example, 1.