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This can be monitored at pad 106, pin 88 on the TGV. This DAC is more or less consistent with numbers shown in the only documentation of this DAC's performance I found. Those points are shown as squares on this plot.
In each case, I have checked that the TGV32/discriminator responds to the correct set of serial string bits. I have found an overall offset of one bit which occurs between the heap manager and the TGV serial string bits. It appears that the heap manager only captures 15 bits instead of the 16 bits it should take out of the input string. I do not fully understand the origin of this offset, but all of the tests below are with this offset included. If everything works with the exception of this one bit offset, I have marked that set of bits as "working".
Only 6 of the 8 TGV32 positions on the PC/MCM board have a chip installed.
Here is a plot of the DAC output voltage vs. the dac setting:
This plot is also available in postscript. The data points plotted are available here.