spencesellers/4lw

A Base-27 virtual machine, and corresponding software stack.

4lw's Issues

Flesh out instruction format

Proposed spec:

First word (four letters) of an instruction: [AABC], where AA is the opcode, B is the length (in words?) of the complete instruction, and C is reserved for future use.

_ _ should probably be a no-op. Because of the 27 bit nature, the other opcodes can probably be assigned somewhat mnemonicly, perhaps with AD being add and MV being move, etc.

Interrupts

Currently there are no such thing as interrupts in 4LW.

Proposed plan:
Dedicate one of the hardware stacks to interrupt handler addresses.
When an interrupt is fired, the interrupt stack is traversed until one of the handlers closes the interrupt.

Interrupt will have interrupt type code (word) and one word of payload data.

Device input/output

Currently there is no input or output, which together makes up pretty much 100% of what computers are good for.

A curses based interface is probably best?

Project is not open source without a license file

Without a license, this project isn't open source and no one can use the code.

Please use something like http://choosealicense.com/ to decide what license to use. I recommend MIT or GPL.