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The "Target-Defined Header" at J15 is used to set pins P3.3/P3.4/P3.5 to high/low. These pins each contain pull-downs, and mounting a header will set the associated pin high as shown below:
{| class="wikitable"todo!Shunt Location!!!8051 Pin|-|H1 - H2|||P3.3 = 1 when jumper mounted, 0 when jumper not mounted.|-|H3 - H4|||P3.4 = 1 when jumper mounted, 0 when jumper not mounted.|-|H5 - H6|||P3.5 = 1 when jumper mounted, 0 when jumper not mounted.|}These pins are used to specify the operating mode of the main test processor.
If using the program/verification mode, the following additional settings allow indexing of the full 16K-bytes of the 87C51RB device:
