apple-pascal-1.3-manual

native code: Assembled code for amicroprocessor. See 6502 code.nested: Characterizing an element(such as a statement or a block)that is contained within alike-structured element. Forexample, an IF statement containedwithin another IF statement.non-block-structured device: Seecharacter device.non-structured variable: Avariable belonging to a simple datatype.NP: New Pointer. 16-bit pointer onzero page that points to the currenttop of the heap (one byte above thelast byte in use).null set: The set containing nomembers.one-stage boot: A startup processthat is accomplished in one stagebecause all the necessary systemfiles are loaded from the same disk.opcode: A singleassembly-language or P-codeinstruction.operand: A value to which anoperator is applied.operating system: Systemsoftware that performs such tasksas loading programs into memoryand managing external devices.operator: A symbol (such as + ormod) that stands for an operation tobe performed on values.ordinality: The quality of anordered, linear relationship.overflow: The condition that existswhen an attempt is made to putmore data into a memory area thanit can hold.packed: A method of allocatingmemory space for a variable suchthat the least possible amount ofspace is required.page: A unit of storage comprisingtwo blocks, or 1024 contiguousbytes.parameter: A special kind ofvariable used by a procedure orfunction.parameter list: The variablesdeclared in the heading of aprocedure or function.Pascal: A high-level programminglanguage with statements thatresemble English sentences. Pascalwas designed to teach programmingas a systematic approach to problemsolving. Named after thephilosopher and mathematician,Blaise Pascal.Pascal system disk: A disk thatcontains the file SYSTEM.PASCAL.The same Pascal system disk shouldbe in the startup drive each time thesystem returns to the mainCommand level.P-code or pseudocode: Thecompiled form of a Pascal program.Pseudocode is amachine-independent intermediatecode that is interpreted by a specificmachine-dependent interpreter atexecution time.physical addresses: Binary orhexadecimal references to memorylocations.P-machine: See pseudomachine.pointer: A variable whose valueconsists of the memory address ofsome other item. Also, a data typethat allows the programmer toallocate memory dynamically.V-12Glossary