Yes, by daisy-chaining together multiple machines using SPDIF. Using correct impedance coax (75ohm) or optical cables, connect the SPDIF source (CD, DAT, MD etc) to the digital input of the first machine, then the digital output of the first machine to the digital input of the second machine, the digital output of the second machine to the digital input of the third machine etc. Ensure blank CDR’s are loaded and then press Digital Synchro (Al Sync or 1 Sync depending on your requirements) on all machines. Allow the machines to go through their setup routine (Optimum power calibration) and confirm that all machines detected the source during setup (i.e. CD, DAT, MD, etc). Press Play on the source machine and in theory all machines should automatically start recording together as if they were one!

Alternatively, use a digital distribution amplifier that splits the digital input signal into multiple digital output signals with the correct electrical characteristics. Each digital output can then be routed to an 830/850 input.