This SWI is obsolete. Use OS_ChangeEnvironment instead.
=> R0 = address of error handler, or 0 to read
R1 = pointer to buffer for the error handler, or 0 to read
R2 = address of escape state change handler, or 0 to read
R3 = address of event handler, or 0 to read
<= R0 = previous error handler address
R1 = previous buffer address
R2 = previous escape routine address
R3 = previous event handler address
Internally, OS_Control just calls OS_ChangeEnvironment.
See PRM 1, page 296.
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