RE: LQ instruction question

[Gene_Gaunt/ReviewWorks@xxxxxxxxxxxxxxx]

So a logical tag is, on CISC,  the AND of four physical tags denoting
four consecutive words; and on RISC, the AND of two physical tags
denoting two consecutive doublewords.

LQ might know the source pointer type by checking the first three bits
in the observable part.  You can see them with:

DCL PTR P;
DCL DD P2 DEF(P) CHAR(16);

The left-most byte appears like:

X'00' = system pointer
X'80' = space pointer
X'A0' = invocation pointer
X'A1' = procedure pointer
X'A2' = instruction pointer
X'A3' = suspend pointer
X'A4' = label pointer
X'C4' = data pointer


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