Step-Amplitude: .5V (no resistor)
The staircase looks ok! it's not broken trace issue.
The design of step generator circuit is different between 576 and 577.
In case of 577 the traces synchronize with the collector supply
4 traces per period(one trace per 90 degree).
This could be seen by the timing between collector supply and staircase.
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Hope it helps.
Jack
