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Computing (FOLDOC) dictionary
patch space
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An unused block of bits left in a binary so that it can later
be modified by insertion of machine-language instructions
there (typically, the patch space is modified to contain new
code, and the superseded code is patched to contain a jump or
call to the patch space). The widening use of HLLs has made
this term rare; it is now primarily historical outside IBM
shops. See patch, zap, hook.