momiji

m68k emulator infrastructure

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Table of contents

momiji::StatusRegister

Defined in header <momiji/System.h>

struct StatusRegister

A class representing the status register. The status register is set accordingly when executing a cmp, add, sub, mul or div.

Member fields

Field Type Notes Default value
extend

Implementation-defined

Also called ‘E’ or ‘X’, it signals if a sign extension happened.

Unimplemented.

0
negative

Implementation-defined

Also called ‘N’, it signals if the resulting number is negative.

0
zero

Implementation-defined

Also called ‘Z’, it signals if the resulting number is zero.

0
overflow

Implementation-defined

Also called ‘V’, it signals if an overflow happened.

0
carry

Implementation-defined

Also called ‘C’, it signals if a carry happened.

Unimplemented.

0

Status of implementation

When a status is “unimplemented” it means that no instruction changes that value.

This is not by design! This just means that sooner or later it will be set by an instruction.