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The '''Tektronix 821''' is a 4-bit word recognizer accessory for triggering a scope on a combination of digital signals. | The '''Tektronix 821''' is a 4-bit word recognizer accessory for triggering a scope on a combination of digital signals. | ||
The 821 can be powered from the scope's probe power socket. Up to four 821s can be cascaded for up to 16 input bits. | The 821 has a [[LEMO S-series connector]] by which it can be powered from the scope's probe power socket. | ||
Up to four 821s can be cascaded for up to 16 input bits. | |||
==Links== | ==Links== | ||