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Re: VAX architectural critiques - Re: VAX RPB (Restart Parameter Block)
On Feb 6, 2013, at 6:25 PM, Toby Thain wrote:
> Least-significant-bit instructions would have seemed useful at the time to
> implement a Pascal-ish *Boolean* (*not* a C "boolean" test - C hadn't
> dominated the semantics of everything yet).
You are looking through a unix-tinted looking glass which is incorrect.
Remember the VAX was designed to implement VMS and VMS uses the least
significant bit to indicate success / failure on return status, and that
is what the BLB[CS] instruction was designed for.
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