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Load Instructions

A load instruction reads the byte at the address in MN into either A or B:

It assigns the zero flag, z, to 1 if the read byte is zero, and to 0, otherwise. Similarly, it assigns the negative flag, n, to 1 if the read byte is negative (if bit-7 is 1), and to 0, otherwise.

A load instruction maps to an opcode with bits 0100000d, where A and B correspond to d values 0 and 1, respectively.