There are four basic modes by which the 2020 formulates its output signal: 1. Standard Modes; by which classical waveshapes such as square, pulse, sine, triangle, sawtooth, etc. are readily generated. 2. Polynomial Mode; by which waveshapes are generated from user supplied mathematical expressions of the form Y = f(t). User expressions of this form can be named and stored in internal nonvolatile memory. 3. Real World waveforms can be captured (digitized) on the Data Precision Model “6000” Waveform Analyzer and downloaded to the “2020” for replication without the need for an additional controller. 4. Predetermined digital pattern data can be down-loaded from any intelligent host (via IEEE-488 or RS232) for analog generation by the “2020”. Note: item 3, above, requires the normal or high speed GPIB 488 option and Item 4 requires the same option or the RS232 option. Other options include a math co-processor to speed the execution of item 2 above, as well as output memory size options and additional non-volatile memory. To determine the installed options, key in the sequence [2nd] [OP] [7] [ENTER] and scroll through the displayed text with the DOWN CURSOR key. Press [RESTORE] to exit the review of installed options.