Description:

Pop the top short off of the stack and add it to the new top short on the stack.

Pseudo Code:

shortVal = stack[sp - 2]
sp = sp - 2
stack[sp - 2] = stack[sp - 2] + shortVal
pc = pc + 1

Flags Affected:

D	H	C	Z	N

Possible Errors:

tvmStackUnderflow

-

There were not enough shorts in the stack.

Example:

adds

Before stack   top 1 0x3C 2 0x7E 3 0xAB 4 0x27   bottom

After stack   top 1 0xE7 2 0xA5   bottom