The system is comprised of 211 relays, their associated
control circuitry, and a power supply.
The software uses an assembly language routine that constantly
refreshes at a very high speed, preventing noise from energizing relays
should not be energized.
The relays are turned on and off in a sequence that removes
current from their contacts first in order to minimize contact wear.
Diagnostic routines include complete tester calibration,
individual relay tests, and ohm meter continuity tests.
The software automatically selects a proper filament voltage
takes into account the transformer, wiring, and relay contact voltage
More details and pictures can been
seen in the Photo
The database contains the data from all of the following card sets:
The complete "large" military card set
The Western Electric card set
The CA-4 adapter card set
The CA-5 adapter card set
The older tubes from the Model 123A card set
In addition, tubes are added to the database from time to time.
you can add them yourself. Click here for