td4 1.0.2

4bit CPU emulator

td4-py

This repository is a 4bit CPU emulator written by Python.
The original is CPUの創りかた.

features

• Read from plain text files, td4 format files
• Variable clock, manual clock selectable
• Beep support
• Runs in CLI

Install

https://pypi.org/project/td4

pip3 install td4

Usage

args

td4 [-h] [-i INPUT] [-c CLOCK] [-b] file

file

File to read.
Check https://github.com/yashikota/td4-py#support-file-format for the supported format.

example

td4 program.txt
td4 Knight2K.td4

help

Show help message and exit.

example

td4 -h

input

Any binary can be specified.
Default is 0000.

example

td4 -i 0000
td4 --input 1111

clock

Any number or manual can be specified.
Default is 10.

example

td4 -c 1
td4 --clock 10
td4 -c manual

beep

Specifies whether a beep is sounded.
Operates when the MSB of out is set to 1.
Default is False.

example

td4 -b
td4 --beep

Support file format

Input from plain text files supports several patterns.

Pattern 1

Opcode(Assembly LowerCase) + Space + Immediate data

out 0011
out 0110
out 1100
out 1000
out 1000
out 1100
out 0110
out 0011
out 0001
jmp 0000

Pattern2

Opcode(Assembly UpperCase) + Space + Immediate data

OUT 0111
ADD A,0001
JNC 0111
ADD A,0001
JNC 0011
OUT 0110
ADD A,0001
JNC 0110
ADD A,0001
JNC 1000
OUT 0000
OUT 0100
ADD 0001
JNC 1010
OUT 1000
JMP 1111

Pattern3

Opcode(binary) + Immediate data

10110011
10110110
10111100
10111000
10111000
10111100
10110110
10110011
10110001
10010000

Pattern4

Opcode(binary) + Space + Immediate data

1011 0011
1011 0110
1011 1100
1011 1000
1011 1000
1011 1100
1011 0110
1011 0011
1011 0001
1001 0000