One was the editable source code in text format, created using the SAVE command and normally placed in a. Ben Davis Painter Overalls. Cadette to Ambassador Uniform. This avoided the need to repeatedly decode the keywords as strings, once converted to the tokenized form the keywords were numbers that pointed to routines to run that function.
This feature of chaining to a certain line number allowed programs to signal to each other that they were being called from another program.
The use of a shared memory section called core common also allowed programs to pass data to each other as needed. Disk files could also be used but were slower. To conserve memory, the interpreter included a garbage collecting memory manager, used for both string data and byte-code.
A running program could be interrupted, have variables examined and modified, and then be resumed. On top of this, DEC added a number of unique flow-control structures. Line numbers were positive integers from 1 to Multiple statements could be placed on a single line using: The LET keyword, for variable assignment, was optional. Variables with no suffix were floating point 8 bytes, range. Any of these data types could be used in an array of one or two dimensions, using the DIM keyword.
The program would first OPEN a file, which would assign it a number, and then the DIM would refer to the data in that file and could be used like any other array. This was a very useful technique for saving memory, as data did not have to be encoded into the program itself.
Strings could be delimited by single or double quotes. This offered a compact format for many common loop structures. It used true compilation into threaded code and wrote its output to object files compatible with the machine code object files produced by the assembler and other language systems.
These object files could be kept in libraries. A linker the TKB taskbuilder then created executable files from object files and the libraries. TKB also supported overlays; this allowed individual routines to be swapped into the virtual address space as needed, overlaying routines not currently being used.
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