result is negative.

result is positive.

result is zero.

keyboard data.

keyboard status.

add.

bitwise and.

branch.

jump.

jump register.

load.

load indirect.

load register.

load effective address.

bitwise not.

reserved.

todo.

store.

store indirect.

store register.

execute trap.

flags register.

program counter.

general purpose registers.

registers.

registers.

registers.

registers.

registers.

registers.

registers.

operand can be one of: label, register, string, number.

CPU word size.