https://github.com/doctorwkt/cscv2

Version 2 of my Crazy Small CPU
https://github.com/doctorwkt/cscv2

7400 alu cpu logic

Last synced: 29 days ago
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Version 2 of my Crazy Small CPU

• Host: GitHub
• URL: https://github.com/doctorwkt/cscv2
• Owner: DoctorWkt
• License: gpl-3.0
• Created: 2017-10-10T21:52:48.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2018-12-02T23:32:39.000Z (over 6 years ago)
• Last Synced: 2025-03-31T07:51:12.747Z (2 months ago)
• Topics: 7400, alu, cpu, logic
• Language: Perl
• Size: 4.2 MB
• Stars: 69
• Watchers: 4
• Forks: 10
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Crazy Small CPU, version 2

This repository holds the files associated with Warren's crazy small

breadboard CPU built with only eleven chips. For more details on the design of

the CPU itself, see the

[Crazy Small CPU website.](http://minnie.tuhs.org/Programs/CrazySmallCPU)

The files are:

 * _crazycpu.circ_, a version of the CPU that runs in Logisim

 * _Schematic.pdf_, a PDF version of the CPU's breadboard design done in Kicad

 * _cas_, the assembler for the CPU

 * _clc_, a very crude compiler that outputs assembly that can be given to _cas_

 * _csim_, a simulator that can run assembled programs. This allows you to test programs without loading them into Logisim or burning ROMs

 * _gen_alu_, a program to generate the contents of the ALU ROM

 * _notes_, my journal and notes as I went through the design and implementation stages

 * _Makefile_, to help make some of the ROM files. _make all_ will build the ALU ROM contents, assemble _fibminsky.s_ and produce the top and bottom control ROM images

Some example programs in the _Examples_ directory include:

 * _fibminsky.s_, a program that calculates Fibonacci numbers and then draws a sine wave using Minsky's circle algorithm.

 * _genfibn_, a Perl program that generates the assembly code for the Fibonacci program. You tell it what size Fibonacci number to generate, up to 24 digits.

 * _minsky.cl_. This is a reimplementation of the Minsky's circle algorithm program in the high-level language, just to test the compiler. Use the Makefile to build _minsky_, then run _csim_ by hand.

 * _bubblesort.s_, sort an array of numbers with Bubblesort.

 * _circle.s_, draw a circle using Minsky's circle algorithm and VT100 escape sequences.

 * _decimal.s_, print out numbers in decimal.

 * _enumttt.s_, enumerate winning tic-tac-toe boards.

 * _firstfunction.s_, an example of function calls and returns.

 * _genascii.s_, generate all the printable ASCII characters.

 * _hanoi.s_, perform the Towers of Hanoi algorithm.

 * _hexbench2.s_, a CPU speed testing program.

 * _mel.s_, print two stanzas of "Mel the Programmer".

 * _printdecs.s_, print out numbers in decimal.

 * _printhex.s_, print one number out in hexadecimal.

 * _printhexes.s_, print numbers out in hexadecimal.

 * _stack.s_, an example of a stack and its operations.

The _Verilog_ directory holds an implementation of the CPU in Icarus Verilog. A description of the CPU's instruction

set can be found in _Instructions.md_. A description of the _cas_ assembler and the _csim_ simulator can be found

in _Usage.md_.

 

 If you want to leave any comments, feel free to use the [GitHub issues page](https://github.com/DoctorWkt/CrazySmallCPU/issues) for this purpose.