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>Does anyone know where I can find a working example of a Mod10 check digit
routine?<

Don't have a working example, but the details are found in the "SDA Users
Guide and Reference for the System/36 Environment" (SC09-1893-00):

2.4.7.1 Modulus 10
 
To determine the modulus 10 self-check digit, disregard the farthest right
digit and do the following calculation on the remaining digits:
 
1.  Multiply the unit position and every alternate position of that number
    by 2.
 
2.  Add the digits in the products to the digits in the number that were
    not multiplied in step 2.
 
3.  Subtract the sum from the next higher number ending in 0.
 
 
The difference is the self-check digit.  Compare this digit with the
farthest right digit of the input field.  If those digits are the same,
the self-check digit is successful.
 
For example, if you specify modulus 10 self-checking for an input field
and the operator types 436188:
 
 
         Number to be self-checked         4 3 6 1 8
 
         New farthest right position and   4   6    8
         every alternate position
 
         Multiply by 2                     8  12  16
 
         Digits not multiplied               3   1
 
         Add                               8 + 3 + 1 + 2 + 1 + 1 + 6 = 22
 
         Next higher number                30
         ending in 0
 
         Subtract                          30 - 22 = 8
 
         Self-check digit                  8
 
The self-check digit matches the farthest right digit of the entered
number.



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