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Booting up the 3ESS 2 года назад


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Booting up the 3ESS

After several years of work, volunteers Astrid and Colin have gotten the 3ESS to the point where it is semi-reliably bootable. This was no easy task. This system was designed to start up once, and then run for tens of years. The 3ESS is a telephone switch designed by Bell Labs in the mid-1970s. It consists of a pair of custom designed computers that control an analog switching fabric in real-time via several thousand scan and distribute points (think GPIO on modern hardware). Chapter List: 00:00 Fuses & Converters 01:55 Tape Drives, Teletype, System Status Panel 02:41 Processors (CU 0, CU 1) 06:02 CU 0 Bootup Complete 06:40 Post-Boot Cleanup, Error Recovery 11:25 Running Diagnostics on CU 1, Re-tensioning Tape 15:15 Swap (Failover) from CU 0 to CU 1

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