Description:

Pop the top byte off the stack and place it in the stack as specified by the 0-based absolute (from bottom) offset parameter.

Data (2 bytes):

offset: offset into the stack where the byte popped from the top of the stack is to be stored.

Pseudo Code:

stack[(short) program[pc + 1]] = stack[sp - 1]
sp = sp - 1
pc = pc + 3

Flags Affected:

D	H	C	Z	N

Possible Errors:

tvmStackUnderflow	-	There is no byte on the stack to pop.
tvmStackError	-	The stack index is invalid.

Example:

popbsa 0x0004

Before stack   top 1 0x03 2 0xAA 3 0x32 4 0x02 5 0x23 6 0x68 7 0x26   bottom

After stack   top 1 0xAA 2 0x32 3 0x03 4 0x23 5 0x68 6 0x26   bottom