load Redirection of the text interpreter's input stream to be from mass storage. This is the general method for compilation of new definitions into the dictionary. mass storage Storage which resides on the disk drive(s), outside the memory address space 0..65,535. Mass storage data is made available in the form of 1024-byte blocks. A block is accessible within the memory address space in a block buffer. When a block has been indicated as UPDATEed (modified) the blockwill ultimately be transferred to mass storage. number When values exist within a larger field, the most- significant bits are zero. 16-bit numbers are represented in memory by addressing the first of two bytes at consecutive addresses. The address of the least significant byte is one greater than the address of the most significant byte. Double numbers are represented on the stack with the most-significant 16 bits (with sign) most accessible. Double numbers are represented in memory by two consecutive 16-bit numbers. The address of the least significant 16 bits is two greater than theaddress of the most significant 16 bits. The byte order within each 16-bit field is the same as for 16-bit numbers. See: "arithmetic, two's complement" "number types" number conversion Numbers are maintained internally in binary and represented externally by using graphic characters within the ASCII character set. Conversion between the internal and external forms is performed using the current value of BASE to determine the digits of a number. A digit has a value ranging from zero to the value of BASE-1. The digit with the value zero is represented by the ASCII character "0" (position 3/0 with the decimal equivalent of 48). This representation of digits proceeds through the ASCII character set to the character "9" corresponding to the decimal value 9. For digits with a value exceeding 9, the ASCII graphic characters beginning with the character "A" (position 4/1 with the decimal equivalent 65) corresponding to the decimal value 10 are used. This sequence then continues up to and including the digit with the decimal value 71 which is represented by the ASCII character "~" (position 7/14 with a decimal equivalent 126). A negative number may be represented by preceding the digits with a single leading minus sign, the character "-". number types All number types consist of some number of bits. These bitsare either arbitrary or are weighted. Signed and unsigned numbers use weighted bits. Weighted bits within a number have avalue of a power of two beginning with the rightmost (least-significant) bit having the value of two to the zero power. This weighting continues to the leftmost bit increasing the power by one for each bit. For an unsigned number this weighting pattern includes the leftmost bit; thus, for an unsigned 16-bit number the weight of the leftmost bit is 32,768. For a signed number this weighting pattern includes theleftmost bit but the weight of the leftmost bit is negated; thus, for a signed 16-bit number the weight of the leftmost bit is -32,768. This weighting pattern for signed numbers is calledtwo's complement notation. Unspecified weighted numbers are either unsigned numbers or signed numbers; program context determines whether the number is signed or unsigned. pictured numeric output The use of numeric output definitions which convert numerical values into text strings. These definitions are used in a sequence which resembles a symbolic 'picture' of the desired text format. Conversion proceeds from least-significantdigit to most-significant digit, and converted characters are stored from higher memory addresses to lower. program A complete specification of execution to achieve a specific function (application task) expressed in FORTH source code form. receive The process of obtaining one character from the keyboard. recursion The process of self-reference, either directly or indirectly. return See "enter" search order A specification of the order in which selected vocabularies in the dictionary are searched. Execution of a vocabulary makesit the first vocabulary in the search order. The dictionary is searched whenever a word is to be located by its name. This order applies to all dictionary searches unless otherwise noted. The search order begins with the last vocabulary executed and ends with FORTH. source definition Text consisting of word names suitable for compilation or execution by the text interpreter. Such text is usually arranged in blocks and maintained on a mass storage device. stack, data A last in, first out list consisting of 16-bit binary values. This stack is primarily used to hold intermediate values during execution of word definitions. Stack values may represent numbers, characters, addresses, boolean values, etc. When the name 'stack' is used alone, it implies the data stack. stack, return A last in, first out list which contains the addresses of word definitions whose execution has not been completed by the address interpreter. As a word definition passes control to another definition, the return point is placed on the return stack. The return stack may cautiously be used for other values. string, counted A sequence of consecutive 8-bit bytes located in memory by their low memory address. The byte at this address contains a count 0..255 of the number of bytes following which are part of the string. The count does not include the count byte itself. Counted strings usually contain ASCII characters. string, text A sequence of consecutive 8-bit bytes located in memory by their low memory address and length in bytes. Strings usually, but not exclusively, contain ASCII characters. When the term 'string' is used alone or in conjunction with other words it refers to text strings. structure, control A group of FORTH words which when executed alter the execution sequence. The group starts and terminates with compiler words. Examples of control structures: DO ... LOOP DO ... +LOOP BEGIN ... WHILE ... REPEAT BEGIN ... UNTIL IF ... THEN IF ... ELSE ... THEN . transportability This term indicates that equivalent execution results when aprogram is executed on other than the system on which it was created. See: "equivalent execution" true A non-zero value represents the true state of a flag. Any non-zero value will be accepted as 'true'. vocabulary An ordered list of word definitions. Vocabularies are an advantage in separating different word definitions that may havethe same name. More than one definition with the same name can exist in one vocabulary. The latter is called a redefinition. The most recently created redefinition will be found when the vocabulary is searched. vocabulary, compilation The vocabulary into which new word definitions are appended. word A sequence of characters terminated by one blank or the end of the input stream. Leading blanks are ignored. Words are usually obtained via the input stream. word definition A named FORTH execution procedure compiled into the dictionary. Its execution may be defined in terms of machine code, as a sequence of compilation address, or other compiled words. word name The name of a word definition. Word names are limited to 31characters and may not contain an ASCII space. If two definitions have different word names in the same vocabulary they will be uniquely findable when this vocabulary is searched. See: "vocabulary" word set, assembler extension Additional words which facilitate programming in the 6809 machine language. word set, double number extension Additional words which facilitate manipulation of 32-bit numbers. word set, required The minimum words needed to compile and execute Standard Programs. word set, system extension Additional words which facilitate the access to internal system characteristics. word, standard A named FORTH procedure definition, in the Required word setor any extension word sets, formally reviewed and accepted by the FORTH Standards Team. ** END ** 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Technical Reference Manual