000			03519nam a2200349 i 4500
001			OTLid0000593
003			MnU
005			20241120064017.0
006			m o d s
007			cr
008			180907s2016 mnu o 0 0 eng d
040			_aMnU _beng _cMnU
050		4	_aQA76
100	1		_aKann, Charles W. _eauthor
245	0	0	_aImplementing a One Address CPU in Logisim _cCharles Kann
264		2	_aMinneapolis, MN _bOpen Textbook Library
264		1	_a[Place of publication not identified] _bA.T. Still University _c[2016]
264		4	_c©2016.
300			_a1 online resource
336			_atext _btxt _2rdacontent
337			_acomputer _bc _2rdamedia
338			_aonline resource _bcr _2rdacarrier
490	0		_aOpen textbook library.
505	0		_a1. Introduction -- 1.1 Basic Components in a CPU -- 1.2 Comparisons of Computer Architectures -- 1.3 Von Neumann and Harvard Architectures -- 2. Assembly Language -- 2.1 What is Assembly Language -- 2.2 Assembly Language Caveats -- 2.3 Assembler Directives -- 2.4 Data types -- 2.5 Designing an Assembly Language -- 2.6 Assembler Programs -- 3. Machine Code -- 3.1 Overview of the machine code instruction format -- 4. Assembler program -- 4.1 Running a program on the One-Address CPU -- 5. CPU implementation -- 5.1 The sign extend unit -- 5.2 The ALU -- 5.3 The Control Unit (CU) -- 5.4 The CPU -- 5.5 Implementing the CU
520	0		_aMost computer users have an incorrect, but useful, cognitive metaphor for computers in which the user says (or types or clicks) something and a mystical, almost intelligent or magical, behavior happens. It is not a stretch to describe computer users as believing computers follow the laws of magic, where some magic incantation is entered, and the computer responds with an expected, but magical, behavior. This magic computer does not actually exist. In reality computer are machines, and every action a computer performs reduces to a set of mechanical operations. In fact the first complete definition of a working computer was a mechanical machine designed by Charles Babbage in 1834, and would have run on steam power. Probably the biggest success of Computer Science (CS) in the 20th century was the development of abstractions that hide the mechanical nature of computers. The fact that average people use computers without ever considering that they are mechanistic is a triumph of CS designers. This purpose of this monograph is to break the abstract understanding of a computer, and to explain a computer's behavior in completely in mechanistic terms. It will deal specifically with the Central Processing Unit (CPU) of the computer, as this is where the magic happens. All other parts of a computer can be seen as just providing information for the CPU to operate on. This monograph will deal with a specific type of CPU, a one-address CPU, and will explain this CPU using only standard gates, specifically AND, OR, NOT, NAND and XOR gates, and 4 basic Integrated Circuits (ICs), the Decoder, Multiplexer, Adder, and Flip Flop. All of these gates and components can be described as mechanical transformations of input data to output data, and the overall CPU can then be seen as a mechanical device.
542	1		_fAttribution
546			_aIn English.
588	0		_aDescription based on online resource
650		0	_aComputer Science _vTextbooks
710	2		_aOpen Textbook Library _edistributor
856	4	0	_uhttps://open.umn.edu/opentextbooks/textbooks/593 _zAccess online version
999			_c38823 _d38823