Reciprocal crosses were made between pairs of plants showing the "aberrant ratio" (AR) effect at the a locus, and simultaneously between these plants and an aa tester. The results suggested that the AR effect in the particular line that was used could be explained by inactivation of a gene other than A, but also required for aleurone color. Segregation ratios in additional crosses largely fit e...

This note refers to the effect of the proximity parameter on the operation of (standard) property testers. Its bottom-line is that, except in pathological cases, the effect of the proximity parameter is restricted to determining the query complexity of the tester. The point is that, in non-pathological cases, the mapping of the proximity parameter to the query complexity can be reversed in an a...

We describe a low-cost, functional tester for the MacII that allows students to test and debug digital systems interactively. This tester provides a large number of programmable I/O signals and can be used to test chips, boards and subsystems. Test programs are easily written using a simple, intuitive interface and we expect a variety of interactive graphical testing and debugging environments ...