Yamaha helpers.

The operand 1 register index. i.e. Rn.

The operand 2 register index if @c operand2_is_immediate() is @c false; meaningless otherwise.

@returns @c true if operand 2 is defined by the @c rotate() and @c immediate() fields; @c false if it is defined by the @c shift_*() and @c operand2()

@returns The data size of this operation — e.g. `MOV AX, BX` has a data size of `::Word` but `MOV EAX, EBX` has a data size of `::DWord`. This value i

Preauthorisation call-ins.

Sign-extend @c x to 32 bits and return as a signed 32-bit int.

@returns The desired target track.

Sets the bus error line — @c true for active, @c false for inactive.

Sets C if @c value is non-zero; resets it otherwise.

Sets the current condition codes.

! Setter for MIXED ($C052/$C053; triggers on read or write). * Off: display only text or only graphics. * On: if TEXT off, display text and gra

! Setter for PAGE2 ($C054/$C055; triggers on read or write). * Off: select Page 1. * On: select Page 2 or, if 80STORE on, Page 1 in auxiliary m

! Sets the total output volume of this CompoundSource. */

! Equivalent to set_value16(v | 0xff00). */

@returns @c true if the amount to shift by should be taken from a register; @c false if it is an immediate value.

@returns the number of cycles left until it is guaranteed that a passive reader has received all currently-enqueued bits.

! @returns @c type_info for the field @c name. */

@returns the current value.

! @returns the value currently on the low 8 lines of the data bus. */

Store operand is a lot simpler: only one operand is ever stored, and its address is already known. So this can either skip straight back to ::Decode i

! @returns The name of @c addressing_mode. */

! @returns A vector of all declared fields for this struct. */

Informs the receiver that the named event just occurred for the drive with name @c name.

! Advances a nominated amount of time, applying a previously returned synchronisation event at the end of that period. @param cycles_advanced T

@returns n where n/2 is the head position.

@returns n where n/4 is the head position.

! @returns the average output peak given the sources owned by this CompoundSource and the current relative volumes. */

Adjusts the status for exception processing — sets supervisor mode, disables trace, and if @c new_interrupt_level is greater than or equal to 0 sets t

Other actions.