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This adds the modifiers CONVERT and NOCOVERT to the HI units. When enabled for a unit, 1822 messages will transparently be converted. IMP-to-host messages are converted from the old, short (32-bit) format to the new, long (96-bit) format. Host-to-IMP messages are converted in the other direction. The motivation for this feature, is that the currently running IMP software is from 1974 and only supports short leaders. Some operating systems are from a later era, and only support long leaders.