Computer Programming and Architecture. The VAX by Henry Levy, Richard Eckhouse

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By Henry Levy, Richard Eckhouse

Takes a different platforms method of programming and structure of the VAX

utilizing the VAX as an in depth instance, the 1st half this booklet deals an entire direction in meeting language programming. the second one describes higher-level structures concerns in desktop structure. Highlights comprise the VAX assembler and debugger, different sleek architectures resembling RISCs, multiprocessing and parallel computing, microprogramming, caches and translation buffers, and an appendix at the Berkeley UNIX assembler.

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In this case, the program would probably need to know explicitly how long the string is. Note that the string is surrounded by a delimiter that is not part of the string (in this case, \). Any character can be used to delimit the start and the end of a string, as long as it is not part of the string itself. There are three other storage methods and corresponding directives for strings. A counted ASCII string is a string in which the first byte contains the length of the string. Since the count is limited to a byte, the string can be no longer than 255 characters.

Branch Less Than BLSS X Branch if the result was less than zero. Branch Less Than or Equal BLEQ X Branch if the result was less than or equal to zero. Branch Greater Than BGTR X Branch if the result was greater than zero. Branch Greater Than or Equal BGEQ X Branch if the result was greater than or equal to zero. Jump JMP X Branch unconditionally to location X. 40 The Program Assembler and Debugger To understand how instructions operate, examine a simple longword Add instruction that sums two 32-bit longword integers in memory.

ABC. A ADABCD A equate the symbol ABC to the ASCII equivalent of the three characters ABC. 3. , and for allocating large blocks of storage. BYTE 1,2,3 stores three bytes of data containing the integers 1,2, and 3 into consecutive bytes and defines the label NUMBERS as the address of the byte containing the 1. LONG 156,718,0 stores the integers 156, 718, and 0 into consecutive 32-bit longwords. Here the symbol LIST can be used to address the first longword, whose initial value will be 156. LONG value_list Store specified values in successive longwords in memory.

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