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The ::SHE+ILA:: opcode processor, ILA (Interactive Language Architecture) repeatedly (while not halted) fetches an opcode from the location in SHE (Segmented Hirearchical Environment) pointed to by the Program Counter / Address Register for the current thread of execution, and looks in a Table (the Microcode) using the Opcode as an index, to get the Micro-operation bitmask for that Opcode :) The Table is loaded at Bootstrap time from the dedicated Segment ::MUCODE:: (or in the MS-WIN implementation from the file C:\SHEILA.MUCODE).