ABSTRACT
Number Year Number System of Lines Introduced Installed Processor Comments
1 ESS 5,000-65,000 1965 1,000 No. 1 First processor with separate control and data memories
2 ESS 1,000-10,000 1969 500 No. 2 1A ESS 100,000 1976 2,000 No. 1A Four to eight times
faster than No. 1 2B ESS 1,000-20,000 1975 >500 No. 3A Combined control and
data store; microcoded; emulates No. 2
3 ESS 500-5,000 1976 >500 No. 3A 5 ESS 1,000-85,000 1982 >1,000 No. 3B Multipurpose processor
Phase Recovery Action Effect
1 Initialize specific transient memory. Temporary storage affected; no calls lost
2 Reconfigure peripheral hardware. Initialize Lose calls being established; calls all transient memory. in progress not lost
3 Verify memory operation, establish a Lose calls being established; calls workable processor configuration, verify program, configure peripheral hardware, initialize all transient memory.
