Topic       : Pure Assembler Documentation
Author      : John Kormylo
Version     : PASM.HYP 1.0
Subject     : Documentation/Pure Assembler
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HCP-Version : 3
Compiled on : Atari
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View Ref-File[ User Stack Pointer ]

In User (normal) Mode, the USP is used as the stack pointer and can
be referred to as 'A7' or 'SP'.

However, in Supervisor Mode some other register will be used as
the stack pointer, so that one must then refer to the USP as 'USP'.

See also Stack Pointer, Supervisor Stack Pointer,
         Interrupt Stack Pointer and Master Stack Pointer.