Zed A. Shaw
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Buttons the Computer
This is a simple demo project for the Learn JS the Hard Way Course and also the implementation of the first module introducing the concept of a Turing Machine. In the beginning of the course I'll be introducing a very simple little computer that is a functional Turing Machine, although not something you'd actually want to use. It's purpose is to show how basic computation works, and to provide a simple assembly language anyone can understand. It also provides a simply UI that you can code the computer by only clicking on buttons.
This project was implemented in one day on a Saturday while playing Diablo III on breaks. If you find bugs awesome, let me know. I'll most likely find more as I work on it, but don't expect this to be a billion dollar project.
Buttons is a simple stack machine with arbitrary registers and a limited amount of power known as "clicks" of which you have 128. What does that mean in practice?
- You do most of your calculations by working a stack with PUSH and POP.
- You can store things in a register and name that register anything you want.
- Every operation takes 1 tick to process.
- You have only 128 clicks to complete your calculation.
- You can do all of this with only a single mouse with two buttons.
The current operations are:
- ADD - Add the two numbers on the top of the stack, replace them with the result.
- SUB - Subtract just like add.
- DIV - Divide just like add.
- MUL - Multiply just like add.
- MOD - Modulus just like add.
- POP - Take the top of the stack off and throw it away.
- PUSH - Push a new value onto the stack.
- HALT - Stop the computer with a message, probably an error.
- JUMP - Jump to a line number. Lines start at 0.
- JZ - JUMP but only if the top of the stack is 0.
- JNZ - JUMP but only if the top of the stack IS NOT 0.
- CLR - Clear the machine, kind of a soft reset, good for debugging in a loop.
- STOR - Take the top of the stack and assign it to a register by a name.
- RSTOR - Take the named register and push it onto the stack.
You can try these example programs out at buttons.computer:
PUSH 1 PUSH 2 ADD
PUSH 1 PUSH 1 ADD JUMP 1
PUSH 20 PUSH 1 SUB JZ 5 JUMP 1
PUSH -20 PUSH 1 ADD JNZ 5 JUMP 1
PUSH 100 STOR AX PUSH 50 ADD RSTOR AX SUB
PUSH 0 STOR AX RSTOR BAD NAME PUSH 100 ADD
This software is fully Copyright (C) Zed A. Shaw 2020. It's like a painting at a museum. You can look at it and admire its beauty, but you don't own it and can't take it home with you.
Currently have the following feature requests:
- SWAP operation would simplify a lot of calculations.
- A share this code link to share the code with others.
- PEEK and POKE for writing to a RAM spot.
- IN and OUT for reading and writing numbers.
- Edit it as CODE instead of clicking if you want.
- Better line number display.