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GN_D16, 16bit unsigned division
GN_M16, 16bit unsigned multiplication
GN_D24, 24bit unsigned division
GN_M24, 24bit unsigned multiplication
GN_Gdn, convert an ASCII string to a binary number
GN_Ghn, convert an hexadecimal string to a 32 bits integrer
GN_Pdn, write number as decimal ASCII string