Struct TrapCircuit 

pub(crate) struct TrapCircuit {
    mode: Unsigned12Bit,
    set_metabits_disabled: bool,
}

Fields

mode: Unsigned12Bit

set_metabits_disabled: bool

Implementations

impl TrapCircuit

const TRAP_ON_MARKED_INSTRUCTION: Unsigned12Bit

When this bit is set in mode, fetching an instruction word whose metabit is set causes a trap to occur.

const TRAP_ON_DEFERRED_ADDRESS: Unsigned12Bit

When this bit is set in mode, an instruction cycle which uses a marked deferred address causes the TRAP flag to be raised.

const TRAP_ON_OPERAND: Unsigned12Bit

When this bit is set in mode, use of a marked operand causes the TRAP flag to be raised soon afterward (within a few instructions).

const TRAP_ON_CHANGED_SEQUENCE: Unsigned12Bit

When this bit is set, change of sequence number causes the TRAP flag to be raised. Change of sequence away from sequence 0o42 (the TRAP sequence itself) does not cause the flag to be raised).

const SET_METABITS_OF_INSTRUCTIONS: Unsigned12Bit

When this bit is set, fetching an instruction from a memory word causes the meta bit of that word to be set.

const SET_METABITS_OF_DEFERRED_ADDRESSES: Unsigned12Bit

When this bit is set, the metabit of all deferred addresses used will be set.

const SET_METABITS_OF_OPERANDS: Unsigned12Bit

When this bit is set, the metabits of memory words containing operands will be set.

pub(crate) const fn new() -> TrapCircuit

pub(crate) fn is_set_metabits_disabled(&self) -> bool

Query the hardware switch setting which would disable all setting of metabits.

pub(crate) fn set_metabits_disabled(&mut self, disable: bool)

Change the (emulated) hardware switch setting which (when disable is true) would disable all setting of metabits.

pub(crate) fn set_metabits_of_instructions(&self) -> bool

Indicate whether the machine should set the metabits of words from which it fetches instructions.

pub(crate) fn set_metabits_of_deferred_addresses(&self) -> bool

Indicate whether the machine should set the metabits of words from which it fetches deferred addresses.

pub(crate) fn set_metabits_of_operands(&self) -> bool

Indicate whether the machine should set the metabits of words from which it fetches operands.

pub(crate) fn trap_on_marked_instruction(&self) -> bool

Indicate whether the TRAP flag should be raised during execution of an instruction whose metabit is set.

pub(crate) fn trap_on_deferred_address(&self) -> bool

Indicate whether an instruction cycle which uses a marked deferred address causes the TRAP flag to be raised.

pub(crate) fn trap_on_operand(&self) -> bool

Indicate whether use of a marked operand causes the TRAP flag to be raised soon afterward (within a few instructions).

pub(crate) fn trap_on_changed_sequence(&self) -> bool

Indicate whether change of sequence number causes the TRAP flag to be raised. Change of sequence away from sequence 0o42 (the TRAP sequence itself) does not cause the flag to be raised).

Trait Implementations

impl Debug for TrapCircuit

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Unit for TrapCircuit

fn read( &mut self, _ctx: &Context, _diags: &CurrentInstructionDiagnostics, ) -> Result<MaskedWord, TransferFailed>

The TRAP unit doesn’t perform I/O but reads retain the cycle-left and dismiss features (See Users Handbook, section 4-15 (“TRAP”). Because it cycles left, it must be an “input” unit.

fn write( &mut self, _ctx: &Context, _source: Unsigned36Bit, _diags: &CurrentInstructionDiagnostics, ) -> Result<Option<OutputEvent>, TransferFailed>

I don’t know whether this is supposed to behave like an input unit or an output unit.

fn poll(&mut self, ctx: &Context) -> UnitStatus

Query the status of the unit.

fn connect(&mut self, _ctx: &Context, mode: Unsigned12Bit)

Connect the unit.

fn transfer_mode(&self) -> TransferMode

Query the TransferMode of the unit.

fn name(&self) -> String

Query the name of the unit.

fn disconnect(&mut self, _ctx: &Context)

Disconnect the unit.

fn on_input_event( &mut self, _ctx: &Context, _event: InputEvent, ) -> Result<InputFlagRaised, InputEventError>

Announce an input event for a unit.

fn text_info(&self, _ctx: &Context) -> String

Provide a text summary of the state of the device.