I wrote: > I might at some point contrive a test fixture to verify > the WD2083U-04 behavior against the Am25LS2513, to determine whether > there are any changes.
The Am25LS2513 has no internal state (flip-flops), and most likely even if the WD2083U-04 has differences, it probably doesn't have internal state either. It should therefore be possible to wire it up to be read using an EPROM programmer, e.g., as a 27128. To account for the three-state control, it could be read twice, once with external pullups on the A outputs, and once with external pulldowns. The differences in the read data will show the three-state cases. I'm pretty busy at the moment, but I might have a go at that next week.
