Basic System Problem Analysis - August 2003

42
page 153/17/2003
Basic System Problem Analysis
Short vs. Long Pointers
In short pointer addressing the high order 2 bits of an offset are
used to denote the space register therefore they are NOT used
as part of the address. This means that using short pointers limits
addressability to 2
(30)
-1 or 1GB.
A long pointer reference would specify a space register from 1
to 7, for example:
LDW 272(sr1,r19),r21
Notes: