There are 36 user-visible control/status registers. The registers, which are accessible
through the NPI, are summarized in Table 3-1. When there is an A and B version of a
register, the A part holds the least significant bits, and the B part holds the most significant
bits. The first hex digit of the address refers to NPA5–NPA4, and the second hex digit
refers to NPA3–NPA0.
MC68838 USER'S MANUAL