SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

FORTH WEB SITES

More Forth Web Sites. FIG is the world’s oldest organization supporting Forth programmers and the Forth language. It is a non-profit group that specializes in providing reference and tutorial materials, software, and professional contacts within the industry. A new effort, spearheaded by Stephen Pelc of MPE, a UK-based Forth

vendor.

A CLASSIC FORTH CODE EXAMPLE A Classic Forth Code Example. 12. A Classic Example. Programming in Forth is more of an “art” than programming in any other language. Like painters drawing brushstrokes, Forth programmers have complete control over where they are going and how they will get there. Charles Moore has written, “A good programmer can do a fantastic job with SWIFTFORTH RELEASE HISTORY SwiftForth-3.10.0 (13-Aug-2020) We’re doing some retrofitting in preparation for SwiftForth-x64, so there are some significant changes in this release. We try very hard to minimize code breakage, but please do read the notes for this release carefully. SWIFTFORTH IDE FOR WINDOWS, LINUX AND MACOS SwiftForth requires an i386-compatible CPU. 1 These are the OS-specific requirements: SwiftForth for macOS: Mac OS X 10.6 through macOS 10.14 (requires 32-bit library support; won’t work with Catalina) SwiftForth for Linux: Linux 2.6 kernel or later with 32-bit library support. 1 To program a Beaglebone, Raspberry Pi, or other

embedded ARM

INPUT AND OUTPUT OPERATORS KEY↵. The cursor will advance a space, but the terminal will not print the “ok”; it is waiting for your input. Press the letter “A,” for example, and the screen will “echo” the letter “A,” followed by the “ok.”. The ASCII value is now on the stack, so enter .: KEY A↵ ok .↵ 65 ok.

STARTING FORTH

Starting Forth was written and illustrated by Leo Brodie, a remarkably capable person whose insight and imagination will become apparent. This book is an original and detailed prescription for learning. It deftly guides the novice over the thresholds of understanding that all Forth programmers must cross.

CONDITIONAL

The Forth phrase: 12 = IF FILL-CARTON THEN. tests whether the number on the stack is equal to 12, and if it is, the word FILL-CARTON is executed. If it’s not, execution moves right along to the words that follow THEN. The word = takes two values of the stack and compares them to see if they are equal. If the condition is true, IF allows the CODE IN FORTH BLOCKS Modern Forth language systems store code in files. Older systems used 1024-character blocks of Forth code and a block editor for creating

and editing code.

FIXED-POINT ARITHMETIC Fixed-point arithmetic. arithmetic which deals with numbers which do not themselves indicate the location of decimal points. Instead, for any group of numbers, the program assumes the location of the decimal point or keeps the decimal location for all such numbers as a separate

number.

SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

FORTH WEB SITES

More Forth Web Sites. FIG is the world’s oldest organization supporting Forth programmers and the Forth language. It is a non-profit group that specializes in providing reference and tutorial materials, software, and professional contacts within the industry. A new effort, spearheaded by Stephen Pelc of MPE, a UK-based Forth

vendor.

SWIFTFORTH RELEASE HISTORY SwiftForth-3.10.0 (13-Aug-2020) We’re doing some retrofitting in preparation for SwiftForth-x64, so there are some significant changes in this release. We try very hard to minimize code breakage, but please do read the notes for this release carefully. A CLASSIC FORTH CODE EXAMPLE A Classic Forth Code Example. 12. A Classic Example. Programming in Forth is more of an “art” than programming in any other language. Like painters drawing brushstrokes, Forth programmers have complete control over where they are going and how they will get there. Charles Moore has written, “A good programmer can do a fantastic job with DATA AND THE FORTH STACK Here’s a list of the Forth words you’ve learned so far, including their stack notations (“n” stands for number; “c” stands for character): : xxxx yyy ; ( -- ) Creates a new definition with the name xxx and consisting of word or words yyy. CR. ( -- ) Performs a

carriage return

STARTING FORTH

Starting Forth was written and illustrated by Leo Brodie, a remarkably capable person whose insight and imagination will become apparent. This book is an original and detailed prescription for learning. It deftly guides the novice over the thresholds of understanding that all Forth programmers must cross. INPUT AND OUTPUT OPERATORS KEY↵. The cursor will advance a space, but the terminal will not print the “ok”; it is waiting for your input. Press the letter “A,” for example, and the screen will “echo” the letter “A,” followed by the “ok.”. The ASCII value is now on the stack, so enter .: KEY A↵ ok .↵ 65 ok.

CONDITIONAL

The Forth phrase: 12 = IF FILL-CARTON THEN. tests whether the number on the stack is equal to 12, and if it is, the word FILL-CARTON is executed. If it’s not, execution moves right along to the words that follow THEN. The word = takes two values of the stack and compares them to see if they are equal. If the condition is true, IF allows the CODE IN FORTH BLOCKS Modern Forth language systems store code in files. Older systems used 1024-character blocks of Forth code and a block editor for creating

and editing code.

FIXED-POINT ARITHMETIC Fixed-point arithmetic. arithmetic which deals with numbers which do not themselves indicate the location of decimal points. Instead, for any group of numbers, the program assumes the location of the decimal point or keeps the decimal location for all such numbers as a separate

number.

SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

FORTH WEB SITES

More Forth Web Sites. FIG is the world’s oldest organization supporting Forth programmers and the Forth language. It is a non-profit group that specializes in providing reference and tutorial materials, software, and professional contacts within the industry. A new effort, spearheaded by Stephen Pelc of MPE, a UK-based Forth

vendor.

SWIFTFORTH RELEASE HISTORY SwiftForth-3.10.0 (13-Aug-2020) We’re doing some retrofitting in preparation for SwiftForth-x64, so there are some significant changes in this release. We try very hard to minimize code breakage, but please do read the notes for this release carefully. A CLASSIC FORTH CODE EXAMPLE A Classic Forth Code Example. 12. A Classic Example. Programming in Forth is more of an “art” than programming in any other language. Like painters drawing brushstrokes, Forth programmers have complete control over where they are going and how they will get there. Charles Moore has written, “A good programmer can do a fantastic job with DATA AND THE FORTH STACK Here’s a list of the Forth words you’ve learned so far, including their stack notations (“n” stands for number; “c” stands for character): : xxxx yyy ; ( -- ) Creates a new definition with the name xxx and consisting of word or words yyy. CR. ( -- ) Performs a

carriage return

STARTING FORTH

Starting Forth was written and illustrated by Leo Brodie, a remarkably capable person whose insight and imagination will become apparent. This book is an original and detailed prescription for learning. It deftly guides the novice over the thresholds of understanding that all Forth programmers must cross. INPUT AND OUTPUT OPERATORS KEY↵. The cursor will advance a space, but the terminal will not print the “ok”; it is waiting for your input. Press the letter “A,” for example, and the screen will “echo” the letter “A,” followed by the “ok.”. The ASCII value is now on the stack, so enter .: KEY A↵ ok .↵ 65 ok.

CONDITIONAL

The Forth phrase: 12 = IF FILL-CARTON THEN. tests whether the number on the stack is equal to 12, and if it is, the word FILL-CARTON is executed. If it’s not, execution moves right along to the words that follow THEN. The word = takes two values of the stack and compares them to see if they are equal. If the condition is true, IF allows the CODE IN FORTH BLOCKS Modern Forth language systems store code in files. Older systems used 1024-character blocks of Forth code and a block editor for creating

and editing code.

FIXED-POINT ARITHMETIC Fixed-point arithmetic. arithmetic which deals with numbers which do not themselves indicate the location of decimal points. Instead, for any group of numbers, the program assumes the location of the decimal point or keeps the decimal location for all such numbers as a separate

number.

SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services. FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. See our software consulting services. We also license our proprietary software development systems for use by FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Full details on configuration, setting up your own editor, and how to use SwiftForth are in the the doc directory. So start there first! System requirements: i386-compatible processor. SwiftForth for Windows: Windows Vista or later. SwiftForth for Linux: Linux 2.6 kernel with 32-bit library support. SwiftForth for macOS: macOS up to

10.14 (Mojave)

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth is a high-level programming language, although most versions include an assembler. Forth-system providers often include software tools to help application code make good use of system resources. Forth is interactive. It is conducive to developing modular, well-tested code in shorter development times. It can also result in

very concise code.

PRODUCTS ARCHIVE

Menu. Products & Services. Software Consulting Services; SwiftX Cross Compilers for Embedded Systems DEFINING WORDS IN FORTH In general there are two classes of words which behave in both ways. For purposes of this discussion, we’ll call these two classes “defining words” and “compiling words.”. A defining word is a a word which, when executed, compiles a new definition. A defining word specifies the compile-time and run-time behavior of each member

of the

FORTH BOOKS BY THE EXPERTS 2. In the event of conflict, only the officially printed document X3.215-1994 represents ANS Forth. To purchase a copy, contact the American National Standards Institute’s sales department at (212) 642-4900 or FAX (212) 302-1286; or Global Engineering Documents at (800) 854-7179 or by FAX to (303) 843-9880 requesting Document

X3.215-1994.

SWIFTFORTH IDE FOR WINDOWS, LINUX AND MACOS SwiftForth requires an i386-compatible CPU. 1 These are the OS-specific requirements: SwiftForth for macOS: Mac OS X 10.6 through macOS 10.14 (requires 32-bit library support; won’t work with Catalina) SwiftForth for Linux: Linux 2.6 kernel or later with 32-bit library support. 1 To program a Beaglebone, Raspberry Pi, or other

embedded ARM

STARTING FORTH

Starting Forth was written and illustrated by Leo Brodie, a remarkably capable person whose insight and imagination will become apparent. This book is an original and detailed prescription for learning. It deftly guides the novice over the thresholds of understanding that all Forth programmers must cross. ARCHIVE OF FORTH SYSTEMS AND SOFTWARE Archive of Forth Systems and Software. Forth has been around a long time. It would be a mistake to look at any of these early systems and think they represent today’s standards-based, commercial-grade Forth products. However, there is much to learn from the work of others and Forth’s history is studded with some stunning examples of both INPUT AND OUTPUT OPERATORS KEY↵. The cursor will advance a space, but the terminal will not print the “ok”; it is waiting for your input. Press the letter “A,” for example, and the screen will “echo” the letter “A,” followed by the “ok.”. The ASCII value is now on the stack, so enter .: KEY A↵ ok .↵ 65 ok. FIXED-POINT ARITHMETIC Fixed-point arithmetic. arithmetic which deals with numbers which do not themselves indicate the location of decimal points. Instead, for any group of numbers, the program assumes the location of the decimal point or keeps the decimal location for all such numbers as a separate

number.

CONDITIONAL

The Forth phrase: 12 = IF FILL-CARTON THEN. tests whether the number on the stack is equal to 12, and if it is, the word FILL-CARTON is executed. If it’s not, execution moves right along to the words that follow THEN. The word = takes two values of the stack and compares them to see if they are equal. If the condition is true, IF allows the SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Free IDE, generous license. Powerful Forth IDE for Linux, macOS, and Windows programming. Also: firmware IDE for firmware development -

embedded systems.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS FIXED-POINT ARITHMETIC SOFTWARE DEVELOPMENT SYSTEMS & SERVICESSHIPPING, RETURNS, AND REFUNDSBOOKS AND MANUALSSWIFTFORTHBOOKS & PUBS Software Development Systems and Custom Software Development Services FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. FREE IDE FOR LINUX, MACOS, WINDOWS, EMBEDDED SYSTEMS Free IDE, generous license. Powerful Forth IDE for Linux, macOS, and Windows programming. Also: firmware IDE for firmware development -

embedded systems.

STARTING FORTH

Starting FORTH has been the classic Forth tutorial and textbook since its first release. Many experienced programmers have commented on its concise utility and completeness. Beginners will find a carefully planned introduction to the Forth programming language that will prepare them for other books like Forth Application Techniques and Forth Programmer’s Handbook. SWIFTFORTH IDE FOR WINDOWS, LINUX, MACOSSEE MORE ON FORTH.COM A CLASSIC FORTH CODE EXAMPLESEE MORE ON FORTH.COM DO...LOOP - DEFINITE, INDEFINITE LOOPS - FORTHSEE MORE ON FORTH.COM EXECUTION OF FORTH CODESEE MORE ON FORTH.COM VARIABLES, CONSTANTS AND ARRAYS STACK-MANIPULATION OPERATORS FIXED-POINT ARITHMETIC WHAT IS THE FORTH PROGRAMMING LANGUAGE? Forth, the computer language, was created for programming embedded and real-time applications. Today, it is available for developing applications on Windows, FORTH BOOKS BY THE EXPERTS Forth Programmer’s Handbook. Forth Programmer’s Handbook has earned its reputation as the de facto ANS Forth reference manual, regardless of which Forth implementation you use. It includes extensive Forth language glossaries, as well as generous, lucid discussion of both common and advanced programming subjects.

PRODUCTS ARCHIVE

Menu. Products & Services. Software Consulting Services; SwiftX Cross Compilers for Embedded Systems

STARTING FORTH

Forth Programmer’s Handbook has earned its reputation as the de facto ANS Forth reference manual, regardless of which Forth implementation you use. It includes extensive Forth language glossaries, as well as generous, lucid discussion of both common and advanced programming subjects. ARCHIVE OF FORTH SYSTEMS AND SOFTWARE Forth Books by the experts. Forth Application Techniques helps you learn practical Forth programming from basic to advanced.. Forth Programmer's Handbook has earned its reputation as the de facto Standard Forth reference manual, no matter which Forth implementation you use.. The classics Starting FORTH and Thinking FORTH are both

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DEFINING WORDS IN FORTH In comparison with conventional languages, Forth’s compiler is completely backwards. Traditional compilers are huge programs designed to translate any foreseeable, legal combination of available operators into machine language. FORTH APPLICATIONS, FEATURED EXAMPLES Europay International. Smart cards and Open Terminal Architecture (OTA) The SwiftX Interactive Development Environment was used to develop terminal firmware for Europay International’s Open Terminal Architecture (OTA) used in smart-card point-of-sale terminals. Processor-independent byte-codes, or tokens (conceptually similar to Java implementations), were devised to make smart-card FIXED-POINT ARITHMETIC The decimal point “floats” across the display as necessary. This is called a “floating point display.” “Floating point representation” is a way to store numbers in INPUT AND OUTPUT OPERATORS In this chapter, we’ll explain how Forth handles I/O of character strings to and from disk and the terminal.. Specifically, we’ll discuss disk-access commands, output commands, string-manipulation commands, input commands, and number-input conversion.

CONDITIONAL

A Little Logic. It’s possible to take several flags from various tests and combine them into a single flag for one IF statement. You might combine them as an “either/or” decision, in

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* The Evolution of Forth * Archive: _Journal of Forth Application & Research_

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SOFTWARE DEVELOPMENT SYSTEMS AND CUSTOM SOFTWARE DEVELOPMENT SERVICES FORTH, Inc. has been providing innovative, reliable, custom software development services and firmware engineering services under contract for more than forty years. * See our SOFTWARE CONSULTING SERVICES . We also license our proprietary software development systems for use by other developers: * SWIFTFORTH® for developing Windows, macOS, and Linux applications * SWIFTX® for developing firmware for embedded systems SwiftForth®, SwiftX®, and SwiftOS™ are trademarks of FORTH, Inc. and have been in commercial use since 1997. There is no connection whatsoever with the Swift Programming Language for iOS and macOS, which was announced on June 2, 2014 by Apple, Inc. The phrase “FORTH, Inc.”, the graphical logo, and polyFORTH™ are trademarks of FORTH, Inc. Copyright © 2020 FORTH, Inc. | Web development services by External Design Scroll back to top