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Message: <blockquote data-quote="imhotep" data-source="post: 29733985" data-attributes="member: 562115">This is the block diagram of the Vikng & Voyager CCS. CCS processors contained an instruction interpreter, data path control, and registers (18-bit accumulator, 12-bit link register, 12-bit program counter, 4-bit condition code register) which operated in serial. Instructions were 18-bit words, with the most significant 12-bits containing addresses (4k of direct addressing), and the least significant 6-bits containing operation codes (64 instructions).  The Voyager FDS would be the first spaceflight computer to use CMOS volatile memory.There was a backup magnetic tape unit. No HDD at that tiime. The CPU clock only ran at 250kHz. A typical instruction takes 80 microseconds, that is about 8,000 instructions per second.  Primitive in modern standards but must have been the best available at that time.<a href="https://imgbox.com/P9kQ9W6e" target="_blank"><img src="https://thumbs2.imgbox.com/4e/d0/P9kQ9W6e_t.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></blockquote>

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