! Indicates a movement of the mouse. */

The multiplier register index. i.e. 'Rm'.

The 26-bit offset to add to the PC.

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

! Announces that the 6502 has performed the cycle defined by operation, address and value. On the 6502, all bus cycles take one clock cycle so the

! Requests fetching of the @c count bytes starting from @c address. The handler should write the values from base memory to @c base_target, and

Requests the next byte to serialise onto the I2C bus after this peripheral has been started in read mode. @returns A byte to serialise or std::nullop

A bitfield indicating which registers to load or store.

Asks whether the interrupt status has changed since the last call to @c get_request().

TODO: one day, possibly: schedule the subversion one slot further into the future (i.e. active_ ^ 1) to allow one further instruction to occur as usua

MARK: - TimedMachine

Perform an SBCD of @c lhs - @c rhs, storing the result to @c destination and updating @c status. @discussion The slightly awkward abandonment of sour

! @returns Current phase, scaled up by (1 << precision). */

Complete value get and set.

! Setter for 80COL ($C00C/$C00D; triggers on write only). * Off: display 40 columns. * On: display 80 columns. Doesn't exist on a II/II+. *

! Setter for 80STORE ($C000/$C001; triggers on write only). * Off: cause PAGE2 to select auxiliary RAM. * On: cause PAGE2 to switch main RAM ar

! Setter for ALTCHAR ($C00E/$C00F; triggers on write only): * Off: display text using primary character set. * On: display text using alternate

! Setter for annunciator 3. * On: turn on annunciator 3. * Off: turn off annunciator 3. This exists on both the II/II+ and the IIe, but has

! Sets the attack rate, which should be in the range 0–15. */

! Sets the current border colour. */

! Indicates that button @c index is now either pressed or unpressed. The intention is that @c index be semantic, not positional: 0 for the prima

Set the character ROM for this video output.

! Sets the decay rate, which should be in the range 0–15. */

Sets @c delegate as the receiver of delegate messages.

! Sets the delegate to receive drive speed changes. */

! Sets the CRT delegate; set to @c nullptr if no delegate is desired. */

! Sets the type of display the CRT will request. */

Informs the receiver of the motor-on status of the drive with name @c name.

! Setter for HIRES ($C056/$C057; triggers on read or write). * Off: if TEXT off, display low-resolution graphics. * On: if TEXT off, display hi

Allows the current joystick input to be set.

! Enables or disables key-rate scaling. */