The Strange Birth and Long Life of Unix - IEEE Spectrum

[James Knott]

James Knott wrote:
> BTW, anyone else here remember the Data General I/O, where you could 
> branch on busy & done flags?

Forgot to mention, that could be used for a singe instruction "buzy 
loop", where you'd sit at a single instruction while waiting for an I/O 
operation to complete.  You'd do a "NO I/O instruction and jump back 1 
continuously until the busy flag cleared or the done set.

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