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By Henry Levy, Richard Eckhouse

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

utilizing the VAX as an in depth instance, the 1st half this ebook bargains a whole direction in meeting language programming. the second one describes higher-level platforms concerns in desktop structure. Highlights contain the VAX assembler and debugger, different glossy architectures comparable to RISCs, multiprocessing and parallel computing, microprogramming, caches and translation buffers, and an appendix at the Berkeley UNIX assembler.

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EXAMINE first examines the contents of location MYVAR, deposits decimal 10 in that longword location, and then examines it again. The final EXAMINE with no parameter displays the contents of the longword following MYVAR; that is, an EXAMINE command with no parameter increments the current location to the next longword. Basic Control Flow The basic program control operations are provided by GO and STEP. Initially, GO tells the debugger to begin execution of the program at its entry point (main program).

Arithmetic shift of A by B bits. If B is positive, A is shifted left, and zeros are shifted into the low order bits. If B is negative, A is shifted right and the high order bit of A is duplicated in the high order bits. Logical AND of A and B. Logical OR of A and B. Logical EXCLUSIVE OR of A and B. The Functions of a Symbolic Assembler 49 used. BLKB ARRAYSIZE*4 LENGTH = 4*8*ARRAYSIZE All terms within an expression must be assembly-time constants or symbols. Control Statements Four assembler control statements are used frequently in this text.

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. ASCIC allocates a counted ASCII string, automatically storing the length. ASCIC \hello\ was assembled at location 300, byte 300 would contain the integer 5, byte 301 would contain ASCII h, etc. ASCIZ, allocates a zero terminated string. In this case, there is no count, but a byte whose value is zero is placed following the string.

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