Acer Z320 Service Manual page 101

>Maintain one and only one counter to generate sequence numbers at a
manufacture site in different factory (Factory1/Factory2) and different product
(NB,/Tablet/SHH) that with a unique MM code
VV:
>Engineering version code of hardware, two characters defined by
ODM/vendor. Please use alphanumeric characters, including 0~9 and A~Z
only (Excluding O and I). Special characters are not allowed here. If ODM
do not need to use this VV code, keep it as "00".
This code does not be used to generate SNID. In other words, a SNID code
does not contain VV data.
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