import re

def to_set_c(text):
    # Match pairs of digits and map them to the appropriate ASCII characters
    return ''.join([
        chr(int(ascii_code) + 100 if int(ascii_code) > 94 else int(ascii_code) + 32)
        for ascii_code in re.findall(r'\d{2}', text)
    ])

def check_sum_128(data, start_code):
    sum_value = start_code
    for i, char in enumerate(data):
        code = ord(char)
        value = code - 100 if code > 199 else code - 32
        sum_value += (i + 1) * value

    checksum = (sum_value % 103) + 32
    if checksum > 126:
        checksum += 68
    return chr(checksum)

def encode128(text, code_abc="B"):
    start_code = chr(ord(code_abc.upper()) + 138)
    stop = chr(206)

    if code_abc.upper() == 'C':
        text = to_set_c(text)

    check = check_sum_128(text, ord(start_code) - 100)

    # Replace spaces with ASCII 194
    text = text.replace(" ", chr(194))

    return start_code + text + check + stop