Description:

Compare the top two shorts on the stack .  If they are equal, pop them both and branch to the requested address.  Otherwise, pop only the top short and continue.

Data (2 bytes):

short: 2-byte value for branch address

Pseudo Code:

short1 = stack[sp - 4]
short2 = stack[sp - 2]
if (short1 == short2)
   sp = sp - 4
   pc = branch address
else
   sp = sp - 2
   pc = pc + 3

Flags Affected:

D	H	C	Z	N

Possible Errors:

tvmStackUnderflow	-	There are not enough bytes on the stack to do the comparison.
aVMExitAddressRange	-	The address specified is invalid.

Examples:

cmpsbr (top two shorts are equal)

Before stack   top 1 0x35 2 0x02 3 0x35 4 0x02   bottom

After

cmpsbr (top two shorts are not equal)

Before stack   top 1 0xAB 2 0x04 3 0x35 4 0x02   bottom

After stack   top 1 0x35 2 0x02   bottom