MASK68            139 src/dps8/dps8_hw_consts.h #  define MASK68          (construct_128 (017U, MASK64)) // Hex mode mantissa normalization mask
MASK68            155 src/dps8/dps8_hw_consts.h #  define MASK68          (((word72)1U << 68) - 1U) // Hex mode mantissa normalization mask