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README
MIT

Comp

Simple 4-bit/1 Hz virtual computer for learning purposes

screenshot

For quick start see HOW TO RUN.

Memory

instructions - 4 bits
  |  +-- addresses - 4 bits
  v  v
----***-  <- 0  ----
--*-**-*  <- 1  ---*
---***--  <- 2  --*-
---*****  <- 3  --**
----***-  <- 4  -*--
---***-*  <- 5  -*-*
----**--  <- 6  -**-
---****-  <- 7  -***
-***---*  <- 8  *---
-*--****  <- 9  *--*
--------  <- 10 *-*-
--------  <- 11 *-**
--------  <- 12 **--
-------*  <- 13 **-*
-------*  <- 14 ***-
<OUTPUT>  <- 15 ****
  • Execution starts at the first address (0).
  • Execution stops when program reaches last address (15).
  • Whatever gets written to the last address is sent to the printer.
  • When reading from the last address (15), we get a random byte value.
  • CPU has one 8 bit register.

Instruction set

  • READ ---- - Copies the value at the specified address into register.
  • WRITE ---* - Copies value of the register to the specified address.
  • ADD --*- - Adds value at the specified address to the value of the register, and writes result to the register. If the result is bigger than the maximum possible value (255 = ********) then 255 gets written.
  • SUBTRACT --** - Subtracts value at the speicfied address from the value of the register, and writes result to the register. If the result is smaller than 0 then 0 gets written.
  • JUMP -*-- - Changes the value of the program counter to the specified address, meaning that in the next cycle execution will continue at that address.
  • IF MAX -*-* - Jumps to the specified address if register has value 255 = ********.
  • IF MIN -**- - Jumps to the specified address if register has value 0 = --------.
  • SHIFT R -*** - Moves every bit of the register one spot to the right. This way rightmost bit gets lost, and a leftmost becomes '-'. This is the only instruction that doesn't use the address part, making the last four bits irrelevant.
  • Any instruction that is not defined above is interpreted as READ ---- instruction.

How to run on…

Windows

  • Install Tiny Core Linux on VirtualBox using this instructions.
  • Run the UNIX commands.

UNIX

$ git clone https://github.com/gto76/comp-cpp.git
$ cd comp-cpp
$ ./run

Other versions

  • Mark II, model with separate address space for code and data, and with more instructions. Programs can be saved and loaded and it can run without the interface (instead of a printer, it then uses stdout). Also input can be piped in.

screenshot

The MIT License (MIT) Copyright (c) 2015 Jure Šorn Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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