Your main task is to revise the provided assembly language program for calculating factorials. This time, replace the previous method of handling data with a subroutine that uses local dynamic variables on the stack. Here$$s what you need to focus on:

Dynamic Local Variables: Implement these in the subroutine exclusively. Manage them through the stack using indexed addressing. Avoid PUSH$/$PULL for variable access but use for stack management.

Stack Operations: Utilize INS and DES instructions within your subroutine to manage local variables and return values.

Subroutine Integration: Ensure the factorial calculation is done in a subroutine, with results passed back and stored in the NFAC array.

This modification emphasizes efficient stack management and dynamic local variable handling within the subroutine, replacing the old method of data handling.start of data section

ORG $$9099$

M$.$ FCB $,1,5,8,19,$ $FF

ORG $$919$

MFAC RMB $18$

define any variables that your maIn progra sight neod here

REvereEs: Your subroutine nust not access any of the main

progran variables including M and MFAC.

ORG $ceas

start of your main progras

LDS $ $$91$FF initialize stack pointer

:HIL LOM $,x$ inile$($spointeri $$ sentineL$)\{$

CMPA s$.$

BED ENDHL$1$

PSHX save pointer$1$ on stack

JSR FACT Jlup to subroutine

PULA got result bytes off the stack

PULB

STD $,Y,$ spointer$2=$ result bytes

PULX rotrievo pointer$1$ fron stack

IINX pointer$14$

INY pointer$2$t$+$

INY pointer$24+$

BRA $$HIEI