1. A method of verifying program code conversion performed by an emulator, comprising: a) dividing a subject code into a plurality of blocks and executing one of the blocks of subject code through an emulator in a process image on a subject processor according to an emulation context up until a comparable point in the subject code to provide an emulated machine state; b) performing a context switch to a native context and executing the same block of subject code natively in the same process image on the same subject processor up until the same comparable point in the subject code to provide a native machine state; and c) comparing the native machine state from execution of the one block of subject code natively on the subject processor against the emulated machine state from execution of the same block of subject code on the same subject processor through the emulator at the comparable point in the subject code; wherein the native machine state includes a native memory image and the emulated machine state includes an emulated memory image and (a) and/or (b) includes selectively isolating access to a memory associated with the subject processor to obtain the native memory image and/or the emulated memory image, respectively.