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We can also ship via registered air mail, Normally will take days to airrive at your office. Please choose your preferred shipping method when checking out on our website. We Provode 6 months warranty for our product. These three memory types have their own address space independently from the others.
Amforth does not unify these address spaces into one. Amforth uses the flash memory as the location for all standard data spaces: name, code and data space. Contrary to the standard some words that should operate on the data space use RAM adresses instead.
These words are HERE, fetch ,! Similiarly the so called transient regions are in RAM as well. Other words like , comma operate on the flash address and thus directly in the dictionary. Access is based upon the value of the user pointer UP. It can be changed with the word UP! The UP itself is stored in a register pair. The size of the user area is determined by the size the system itself uses plus a configurable number at compile time.
For self defined tasks this user supplied number can be changed for task local variables. The User Area is used to provide task local information. Without an active multitasker it contains the starting values for the stackpointers, the deferred words for terminal IO, the BASE variable and the exception handler. The multitasker uses the first 2 cells to store the status and the link to the next entry in the task list. Beginning with release 3.
The first one called system user area contains all the variables described above. The second one is the application user area that contains all variables defined with the USER command. The default application user area is empty and by default of size zero. They are always executed, regardless of the value in the state variable. All non-immediate words get compiled verbatim with their respective execution token. It is simply appended to the current DP location. Immediate words are usually executed unless some special action such as postpone is applied.
The immediate words do usually generate some data or compile it to the dictionary. They are not compiled with their execution token. There are no optimization steps involved. The XT are written immediately into the dictionary flash. The inner interpreter, the forth virtual machine, can, just like a real CPU, only execute words, one after the next. This linear control flow is usually not sufficient to do real work. The Forth VM needs to be redirected to other places instead of the next one, often depending on runtime decisions.
Since Edsgar Dijkstra the structured programming is the preferred way to do it. AmForth provides all kinds of them: sequences, selections and repetitions. Sequences are the simple, linear execution of consecutive words. Selections provide a conditional jump over code segments. Multiple selections can be made with case.
Repetitions can be unlimited or limited. There is also support for out-of-band control flow: Exceptions. They provide some kind of emergency exits to solve hard problems.
They can be catched at any level up to the outer text interpreter. It will print a message on the command terminal and will wait for commands. Building Blocks All control structures can be implemented using jumps and conditional jumps.
Every control operation results in either a forward or a backward jump. Contrary the MSP Its inner interpreter uses relative branches instead.
That influences the next higher level word internally, but does not affect words using them. The mark words put the jump destination onto the data stack.
This information is used by the resolve words to actually complete the operation. The mark has reserved and completes the forward jump. Every mark needs to be paired with the right resolve. It the data stack is empty, an exception -4 is thrown.
The conditional execution compiles a forward jump to another location. The jump destination is resolved with then. An else terminates the first jump and starts a new one for the final then.
This way an alternate code block is executed at runtime depending on the flag given to the if. It needs to be paired with a then to resolve the branch destination too. An else would not make any sense, but is syntactically ok. Examples are in the lib directory. The loop commands create a structure for repeated execution of code blocks.
A loop starts with a begin to which the program flow can jump back any time. It uses the do and the leave stack to achieve its goals. The helper word?
The loop index and the loop limit are modified by adding 0x to both numbers. That makes it easy to check the boundary cross required by Forth by simply checking the controller overflow check.
The price to pay is a slightly slower access to the loop index I and J. The runtime of loop the loop checks the limits and with 0branch decides whether to repeat the loop body with the next loop counter value or to exit the loop body. If the loop has terminated, it cleans up the return stack. The access to the loop counters within the loops is done with i and j.
Since the return stack is used to manage the loop runtime, it is necessary to clean it up. This is done with either unloop or leave. Note that unloop does not leave the loop!
Since the dictionary is in flash which may only be written once, the use of create is should be replaced with the command to work properly. Its working is described best using a simple example: defining a constant. The standard word constant does exactly the same. With it a new word gets defined, in this example answer. After that, within con the top-of-stack element 42 is compiled into the newly defined word. That means, it is not compiled into the new word con but executed when con gets compiled.
This compile time action creates a small data structure similar to the wordlist entry for a noname: word. The address of this data structure is an execution token. This execution token replaces the standard XT that a wrongly defined con using create instead of builds would have written already. This leads inevitably to a flash erase cycle, that may not be available on all platforms. Compiler 27 AmForth Documentation, Release 6.
A floating point library is available from the community repository.
The others are at least partially implemented. Loop counters are checked on signed compares. We have won the affirmation of international markets for good prices, fast delivery and guaranteed quantity. We boast our competitive prices and short lead time.
All parts are brand new with original packaging. We promise to provide high quality products with competitive prices, fast delivery and excellent services for our customers. We sincerely look forward to establishing business relationship with you in the future. If you have any need or question for electronic components, feel free to contact us. Datasheet or technical specification in PDF format is available on request for download.
A: Please click on the "Add to Cart" Button and then proceed to checkout. We can also ship via registered air mail, Normally will take days to airrive at your office.