SIM3 Practice Quiz                                  

Each of the following SIM3 programs begins execution at address 0 and will print one or 
more numbers before it halts. What 4-digit numbers are printed? 

1. printed value = ________

   000 8000                 start:  in
   001 8700                         shr
   002 8600                         shl
   003 8100                         out     
   004 0000                         halt
   000                              .end    start
   9999
   
2. printed value = ________

   000 8000                 start:  in
   001 8300                 loop:   inc
   002 8500                         neg
   003 8100                         out
   005 0000                         halt
   000                              .end    start
   0
   
3. printed value = ________

   000 8000                 start:  in
   001 2008                         st      b
   002 1007                         ld      a      
   003 4008                         sub     b
   004 8300                         inc
   005 8100                         out
   006 0000                         halt
   007 9999                a:      .word   9999
   008 0000                b:      .word   0
   000                              .end    start
   10

4. Hand assemble the following program to create a machine language program that
   begins execution at address 000.

   _ _ _   _ _ _ _          start:  in
   _ _ _   _ _ _ _                  st      b
   _ _ _   _ _ _ _                  ld      a      
   _ _ _   _ _ _ _                  sub     b
   _ _ _   _ _ _ _                  inc
   _ _ _   _ _ _ _                  out
   _ _ _   _ _ _ _                  halt
   _ _ _   _ _ _ _         a:      .word   9999
   _ _ _   _ _ _ _         b:      .word   0
   _ _ _                            .end    start