Changed BRZ behavior to chomp a test word from stack instead of checking PSW_Z bit.

[ned1] / docs / design_goals.md

GoalsBuild real hardware to maintain interest in software development.Sanity check before attempting a workstation-capable machine.Develop better hardware intuition.Include sufficient capability to handle a real application after completionof experimentation. A calculator or instrument controller would besatisfactory.Establish a performance mark against which to predict/compare future designs.PrinciplesSimplicity.Let the implementation guide the definition.Keep options open. Postpone decisions where possible.Design for debugging and rework. The CPU should be easily instrumented.Defining what IS NOT is as important as defining what IS.Don’t add functionality unless a real application requires it.Don’t get bogged down in I/O. Use modern hardware where helpful.Worse is better. If 90% functionality can be implemented for 10% effort, doit and move on.The only thing worse than generalizing from a single example is generalizingfrom no example at all.