Review week 18: stack

This week was about the stack. For review:

• push / pop / peek work at the top of the pile and move sp (except peek). Last in, first out.
• poke adr value and get r? db adr access fixed addresses, sp stays put. That turns the stack into a table: address = start + index.
• get / put with other devices: instead of db a pin or a ReferenceId. put is always device, address, value. Only certain devices have memory, the logic memory does not.
• clr / clrd clear the whole memory of a device, via pin or ReferenceId.
• Traps: StackOverFlow with more push than pop, StackUnderFlow with pop on an empty stack, an overwritten sp. After a restart sp is 0, but the contents are still there.
• Ring buffer: lead the pointer in a circle with mod, never store NaN.

You pass from 60 %, the explanations appear after handing in.