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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After you type the program below, LIST it and make sure that you have typed it correctly. If the number of free memory bytes exceedsFRE expr returns a negative number. To store more two-digit hexadecimal numbers in successive bytes in memory, Just open the first address: Program execution continues after a SAVE operation, but a LOAD deletes the current program when it begins reading new information from the cassette tape.
Now you’re ready to use these editing functions to save time when making changes or corrections to your prograin. DATA elements may be any mixture of reals, integers, strings and literals. Remember, a character is not copied into memory until you use the right-arrow key to move the cursor f roro that character on to the next- Your TV display should now look like this: Here’s a program that draws pretty “moire” patterns on your screen: There are four escape functions used for editing: In immediate execution mode, on the other hand, these two messages become?
Anything which can be interpreted as a number, a string or a variable name may be used for expr- If Gxpr is a set of characters which cannot be a variable name, the characters must be enclosed in quotation marks.
Full text of “Applesoft BASIC Programming Reference Manual – Apple Computer”
The HGR command clears “page 1” of graphics memory 8K. If you are in page 1 low-resolution full-screen graphics mode, this clears the entire screen to black. It sounds confusing at first, because the leftmost position is position zero, not 1. This could go on Indefinitely, but we decided to stop after calculating the area for three circles. If RUN is used in an immediate-execution program, any subsequent portion of the immediate-execution program is not executed.
I liked it, but now it is out of date to today’s computers. Many nemory locations contain information which is necessary to the functioning of computer system. See page for map.
VTAB 15 Moves the cursor to the line on the screen specified by the argument. However, it makes no difference in what order you type deferred-execution statements.
In practice, however, the size of arrays is often limited much more by the amount of memory available. A variable name must begin witii an alphabetic character and may be followed nasic any alphanumeric character.
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To be sure, a thicker manual looks more formidable, but when you need the Information, you will be glad that we app,esoft the time and space to put it in. Additional reference material not covered in the chapters can be found in the appendices.
At the extreme limit, manuxl is sometimes curious: Error types are described belovj: If a return is encountered before all the var’s have been assigned responses, two question marks are printed to indicate that an additional response is expected. If you’re interested in finding out about a specific command, the alphabetized index on the inside of the back cover will tell you where to look.
String variables use 2 bytes for the variable name, 1 byte for the length of the string, 2 bytes for a pointer to the location of applesift string in memory, and have 0’s in the remaining 2 bytes. The values of variables manul thrown away and the space in memory used to store them is released when one of four things occurs: APPLESOFT will automatically “house-clean” when this old data runs into the free array space, but if you are using any of the free space for machine language programs or high-resolution page buffers, they may be clobbered.
The greatest advantage of integer variables Is their use in array operations wherever possible, to save storage space. This is done so that when the subroutine is called a second time, the value of the first applesofft will not be lost.
Adjust your TV tint control for these colors. Top Reviews Most recent Top Reviews. Zeroes all variables, arrays and strings.
Your LISTing will not show those spaces. The command sets a flag that causes an unconditional jump if an error occurs later in the program to the program line indicated by linenum. Your TV display should now look like this: Again, type TEXT to see your program. It offers clear referrence and examples of the advanced concepts in program planning, design and development. This is the area used by the HGR command.