label loop
MOV INPUT TO RAM
ADD_VAR_CST REG5 1 REG5 # REG5+1, store REG5
98 REG5 15 loop

MOV REG5 TO REG3
65 REG3 1 REG3 # len()-1
label loop1
COPY_CONST 0 TO REG5
COPY_CONST 0 TO REG4

    label loop2
    MOV RAM TO REG0
    MOV REG5 TO REG2
    ADD_VAR_CST REG5 1 REG5
    MOV RAM TO REG1
    MOV REG2 TO REG5

    IF_GRT REG0 REG1 replace

    label fwd_REG5
    ADD_VAR_CST REG5 1 REG5

    IF_LES REG5 REG3 loop2
    96 REG4 1 loop1
    COPY_CONST 0 TO REG5
    JMP NOW TO output_sorted

label replace
    MOV REG1 TO RAM
    ADD_VAR_CST REG5 1 REG5
    MOV REG0 TO RAM

    COPY_CONST 1 TO REG4
    JMP NOW TO fwd_REG5

label output_sorted
MOV RAM TO OUTPUT
ADD_VAR_CST REG5 1 REG5
JMP NOW TO output_sorted

"Equivalent" Python code:

l = [5,10,2,200,150,120,190,210, 0, 0, 0, 0]

REG0 = 0 # elem A
REG1 = 0 # elem B
REG2 = 0
REG3 = 0 # size list
REG4 = 1 # swap occured
REG5 = 0 # program counter

while l[REG5] != 0:
    REG3 += 1
    REG5 += 1

REG3 -= 1

while REG4 == 1:
    REG5 = 0
    REG4 = 0

    while REG5 < REG3:
        REG0 = l[REG5]
        REG2 = REG5
        REG5 += 1
        REG1 = l[REG5]
        REG5 = REG2

        if REG0 > REG1:
            l[REG5] = REG1
            REG5 += 1
            l[REG5] = REG0

            REG4 = 1

        REG5 += 1

print(l)