DOS 2.0 was developed to support the IBM PC/XT (introduced in March 1983), which came with 128K RAM standard, and models with 256K appeared soon enough. Even the older PCs could be upgraded with additional RAM, and DOS needed to have some mechanism to deal with that extra memory.
When the PLA result arrives, the stall lifts and execution resumes -- either continuing forward (test passed) or redirecting to a fault handler.
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