By Charles Petzold
What do flashlights, the British invasion, black cats, and seesaws need to do with desktops? In CODE, they convey us the inventive methods we manage language and invent new technique of speaking with one another. and during CODE, we see how this ingenuity and our very human compulsion to speak have pushed the technological recommendations of the previous centuries.
Using daily items and favourite language platforms similar to Braille and Morse code, writer Charles Petzold weaves an illuminating narrative for someone who’s ever questioned concerning the mystery internal lifetime of pcs and different shrewdpermanent machines.
It’s a cleverly illustrated and eminently understandable story—and alongside the way in which, you’ll detect you’ve received a true context for figuring out today’s global of computers, electronic media, and the web. it doesn't matter what your point of technical savvy, CODE will allure you—and even perhaps wake up the technophile within.
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Additional info for Code: The Hidden Language of Computer Hardware and Software
17 shows the final machine code together with the memory addresses of the single machine code words, where the binary number representation of the memory addresses was reduced from 16 to 5 bits. The program code uses cells 0 through 22 and the data area cells 23 through 25. Both operands ZERO and ONE are coded as binary numbers; the content of the memory word TIMEC is not yet defined before t~e execution of the program, which is indicated by the broken line. The mnemonic or the processor external address symbol is given for each instruction word as an orientation aid.
Only the modification of the source address is indicated, while the destination address is always R1. The addressing modes could be used the same way for destination addresses. The direct operand addressing is the exception, since direct operands can only be data sources. When addressing words and double words, it is important for the effective address to be an even number. ]n the illustrations, single arrows indicate the operand transfer, and arrows with a dot indicate data addressing. 1. Register addressing (R): The effective address is in the REG field; the operand is in the register file.
In addition to instructions, our program example also includes the definition of operands which are assigned to memory cells. These operands can even be given a value before the beginning of the execution. For these or similar situations, the assembly language contains pseudoops (pseudo instructions) that can be inserted in the symbolic program as program statements. Contrary to machine instructions, pseudo-ops do not always generate binary code; they are used to control the translation process and to produce constants.
Code: The Hidden Language of Computer Hardware and Software by Charles Petzold