This is a simplified assembler and virtual machine used in a classrooms setting to teach the principle of assembly and memory.

The program has 4 registers available. Each are readable and writable.

• reg1
• reg2
• reg3
• reg4

All instructions start with an instruction number, starting from 1. Instructions are read and executed from top to bottom, except if a jump or zjump instruction is called.

Values are numbers between 0 and 9 (included).

[Instruction number] write [register] [value]

That instruction will write the value of the specified register at cursor position.

[Instruction number] jump [Instruction to jump to]

That instruction will jump to the specified Instruction to jump to.

[Instruction number] zjump [Instruction to jump to] [register] [value]

That instruction will jump to the specified Instruction to jump to if the specified register has the specified value.

[Instruction number] add [register] [value]

That instruction will add value to the specified register. If the sum is more than 9, 9 will be written.

[Instruction number] add [register] [value]

That instruction will add value to the specified register. If the diffrence is less than 0, 0 will be written.

[Instruction number] move [value]

That instruction will move the program cursor value blocks in the memory. Value must be between -5 and 5.