A 4-bit CPU design, and use a small number of 74 series chips to produce a simple computer, you can drive 1602 LCD screen ， buzzer and LED lights.

Nibbler Files\~$logicanalyzers.xlsx
.............\Assembler
.............\.........\Assembler.sdf
.............\.........\Assembler.sln
.............\.........\Assembler.v11.suo
.............\.........\Assembler
.............\.........\.........\assembler.cpp
.............\.........\.........\assembler.h
.............\.........\.........\Assembler.vcproj
.............\.........\.........\Assembler.vcxproj
.............\.........\.........\Assembler.vcxproj.filters
.............\.........\.........\Assembler.vcxproj.user
.............\.........\.........\main.cpp
.............\.........\.........\main.h
.............\.........\.........\stdafx.cpp
.............\.........\.........\stdafx.h
.............\.........\.........\targetver.h
.............\.........\Debug
.............\.........\.....\Assembler.exe
.............\Eagle Circuit Schematics
.............\........................\big-mess-o-wires.lbr
.............\........................\eagle.epf
.............\........................\nibbler.brd
.............\........................\nibbler.sch
.............\examples
.............\........\frogger.asm
.............\........\frogger.bin
.............\........\frogger.sym
.............\........\guess-the-number.asm
.............\........\guess-the-number.bin
.............\........\guess-the-number.sym
.............\........\mastermind.asm
.............\........\mastermind.bin
.............\........\mastermind.sym
.............\........\music-waltz.asm
.............\........\music-waltz.bin
.............\........\music-waltz.sym
.............\........\testram.asm
.............\........\testram.bin
.............\........\testram.sym
.............\Microcode Builder
.............\.................\microcode.xls
.............\.................\MicrocodeBuilder.sln
.............\.................\MicrocodeBuilder.v11.suo
.............\.................\MicrocodeBuilder
.............\.................\................\App.config
.............\.................\................\bin
.............\.................\................\...\Debug
.............\.................\................\...\.....\microcode_0.bin
.............\.................\................\...\.....\microcode_1.bin
.............\.................\................\...\.....\MicrocodeBuilder.exe
.............\.................\................\...\.....\MicrocodeBuilder.vshost.exe
.............\.................\................\Form1.cs
.............\.................\................\Form1.Designer.cs
.............\.................\................\Form1.resx
.............\.................\................\MicrocodeBuilder.csproj
.............\.................\................\Program.cs
.............\.................\................\Properties
.............\.................\................\..........\AssemblyInfo.cs
.............\.................\................\..........\Resources.Designer.cs
.............\.................\................\..........\Resources.resx
.............\.................\................\..........\Settings.Designer.cs
.............\.................\................\..........\Settings.settings
.............\Music Maker
.............\...........\Music Maker.sln
.............\...........\Music Maker.v11.suo
.............\...........\Music Maker
.............\...........\...........\App.config
.............\...........\...........\bin
.............\...........\...........\...\Debug
.............\...........\...........\...\.....\Music Maker.exe
.............\...........\...........\...\.....\Music Maker.vshost.exe
.............\...........\...........\...\.....\music-stub.asm
.............\...........\...........\Form1.cs
.............\...........\...........\Form1.Designer.cs
.............\...........\...........\Form1.resx
.............\...........\...........\Music Maker.csproj
.............\...........\...........\Program.cs
.............\...........\...........\Properties
.............\...........\...........\..........\AssemblyInfo.cs
.............\...........\...........\..........\Resources.Designer.cs

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