DF-224とは 意味・読み方・使い方

The DF-224 is a space-qualified computer used in space missions from the 1980s. It was built by Rockwell Autonetics. As with many spacecraft computers, the design is very redundant, since servicing in space is at best difficult and often impossible. The configuration had three CPUs, one active and two spares. The main memory consisted of six memory units, each with 8K 24-bit words of plated wire memory, with up to 48,000 words total. Four memory modules could be powered up at one time, resulting in a maximum of 32K of available memory, though some applications such as the Hubble Space Telescope used fewer memory banks to allow for graceful failure modes. There were three IO processors, one operational and two backups. The power supply consisted of 6 independent power converters, with overlapping coverage of the operating functions.. The processor used fixed-point arithmetic with a two's complement format.