5D6 PROTUN - OPR_W WR W ; write PROTUN (with A-bit) to GDT/LDT
The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.
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At the other end of one of the SDLC links might be an IBM 3770 Data
Питтсбург Пингвинз
While not a cover of The Yardbirds' 1965 single of the same name, it aims for similar territory.