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FUNCTION CALL INTERFACE SPECIFICATIONS
Function Call Interface
General registers and ES/CS registers whose values are guaranteed

9.1.1 General registers and ES/CS registers whose values are guaranteed

This section describes the registers that are guaranteed to have the same values before and after function calls or interrupts, and the registers that are not guaranteed so.

Table 9.1

Relationship between register types and conditions

Register type	Are the Register Values Guaranteed to Be the Same Before and After Function Calls?	Are the Register Values Guaranteed to Be the Same Before and After Interrupts?
General registers AX, BC, DE, and HL	No	Yes
ES and CS registers	No	Yes
PSW and PC registers	No	Yes
MACR register	Yes	Yes
Other registers	No	No