Undocumented instructions

https://github.com/joeledstrom/brookshear-emu/blob/master/src/main/scala/emulator/MachineInstruction.scala

case 0xD => ShiftOp(firstOperand, thirdOperand, (_ << _), "SHL r%d <- r%d << r%d")
case 0xE => ShiftOp(firstOperand, thirdOperand, (_ >> _), "SAR r%d <- r%d >> r%d")

There are NO such instructions in the book (at the least in my edition). I have no idea why they were even added in the first place.

I suggest one of following things:

1.Documenting them and renaming the project as "Extended Brookshear Machine Emulator".

2.Deleting them for sake of purism.

[joeledstrom]

At first I couldn't remember why they were there.

But after looking through my old laboration report from 4 years ago. I see that those instructions were in the homegrown brookshear emu that was used a my university for that class (don't know why, but they were required to be able to follow the lab instructions).

I actually created this project while doing a lab, because i wanted to avoid their windows based emulator program. Wanted something portable that works on Mac / Linux too. Just had some extra time and wanted to play with Scala.js since it was new at the time.

I guess renaming might be the best option, since people may be using this.