How to translate these VM commands?

[riverfish]

I've hit a roadblock in project 7 and it's mainly down to the fact that I haven't the clear idea how to translate VM commands into assembly code.

Take these VM commands for example:
push constant 111
push constant 333
push constant 888
pop static 8

This is what I had in mind:
(deleted)


But absolutely no clue if this is the correct implementation or not. Please help!

[cadet1620]

Those look correct.

The way to test them is to put those commands preceded by @256, D=A, @SP, M=D, into a .asm file.
Load it into the CPUEmulator.
Single-step through it and see if it did the right thing.

static.8 should pop into RAM[16] since it is the only RAM variable.


You will likely be doing a lot of single-step testing of code snippets as you implement the more complex VM commands.


Please edit your post to remove the ASM code.

--Mark

[riverfish]

Thanks a ton Cadet.

I assume that the initialisation with @256 is to initialise the stack pointer ?

[cadet1620]

riverfish wrote

I assume that the initialisation with @256 is to initialise the stack pointer ?

Yes, that is initializing the stack.

It's part of the "bootstrap" code that you will write in project 8.

--Mark