Trait Inst

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pub trait Inst {
    // Required methods
    fn is_held(&self) -> bool;
    fn configuration(&self) -> Unsigned5Bit;
    fn index_address(&self) -> Unsigned6Bit;
    fn opcode_number(&self) -> u8;
    fn is_deferred_addressing(&self) -> bool;
    fn operand_address_and_defer_bit(&self) -> Unsigned18Bit;
    fn operand_address(&self) -> OperandAddress;
}

Expand description

The Inst trait provides a way to extract the various fields within an instruction.

Required Methods§

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fn is_held(&self) -> bool

Obtain the value of the “hold” bit.

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fn configuration(&self) -> Unsigned5Bit

Fetch the configuration field of the instruction. This is used as an index to fetch a system configuration from the F-memory. Table 7-2 in the TX-2 User Handbook explains what data exists in the F-memory in the standard configuration.

The meaning of the values fetched from the F-memory (and thus, the significance of the configuration values of an instruction) is explained in Volume 2 (pages 12-19) of the Technical manual. Some instructions (JMP, for example) use this field differently.

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fn index_address(&self) -> Unsigned6Bit

indexation is actually a signed operation (see the IndexBy trait) but index addresses are shown as positive numbers (e.g. 77) in assembler source code.

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