Question

“Space” and “mark” are rarely-used opposite options for this feature in the RS-232 communication standard. When asked why he didn’t include this feature on the CDC 6600, Seymour Cray supposedly said that this feature “is for farmers”. (15[1])In a common UART (“YOU-art”) configuration called 8N1, the “N” means that this feature is not used. This feature is not used in RAID levels 0 through 2, but RAID 4 implements this feature with a dedicated disk, (-5[1])and RAID 5 distributes it across all the disks. This feature can be viewed as an instance of CRC with the generator (15[1])polynomial (*) x plus 1. Like the more advanced ECC RAM, RAM that implements this feature would contain nine memory chips instead of eight. (-5[1])This feature can detect single bit flips, but not double bit (-5[1])flips. For 10 points, name this simple error detection feature, which adds an extra bit to binary data indicating whether the number of ones is even or (10[1])odd. ■END■ (10[2])

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