LittleBenComputer
An implementation of Little Man Computer written in Python
Why?
Because of who I am as a person
Usage
To run LittleBenComputer, run the Python file from the command line. Pass the path to the LBC code as the first argument.
python lbc.py <filepath>
Example:
python lbc.py test.lbc
The .lbc extension is not required: anything should work.
Opcodes
The opcodes available are as following:
ADD x - adds x to the value in the accumulator.
SUB x - subtracts x from the value in the accumulator.
DAT x - stores the value of x in the marked memory address.
LDA - reads an input and stores it in the accumulator.
OUT - outputs the value in the accumulator.
STA x - stores the value in the accumulator in address x.
BRA x - branches to x.
BRP x - branches to x if the value in the accumulator is zero or positive.
BRZ x - branches to x if the value in the accumulator is zero.
HLT - terminates the program.
Line References
To mark a line so that it can be referenced in the future, write the name of the pointer before the instruction. For example,
myLoop <opcode> <operand>
creates a reference to this line of code with the name myLoop, so that it can be branched to in the future:
BRA myLoop
will then branch to this line.
Variables
To use a variable, first allocate it using a DAT instruction and a default value. For example,
x DAT 12
...
OUT x
will output 12 provided that the value of x has not been updated in the meantime.