$[5$ pts$]$ What does the PC contain on executing JSR MAT in the following code fragment:

$.$ORIG x$3$DA$0$

JSR MAT

ADD RO$,$R$4,$R$2$

MAT ADD RO$,$RO$,$#$1$

RET

$[3$ pts$]$ Assume R$6$ is the stack pointer of a stack that grows toward zero, and initially contains the value x$42$A$0.$ After these operations,

push $7$

push $6$

pop

push $3$

pop

$[3$ pts$]$ What does the following program do:

$.$ORIG x$3000$

TRAP $x20$

TRAP X$21$

$[3$ pts$]$ What will R$7$ be loaded with if the instruction TRAP $23$ is at location x$4$A$3$F$?$