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Eliminates the fiction of setting and getting registers.

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The Disk II seems lower level than that; it will read the data bus whenever it likes, it is the programmer's responsibility to keep up with that. It also reserves the right not to load the bus regardless of whether it receives a read or write access.
This commit is contained in:
Thomas Harte
2018-05-17 21:39:11 -04:00
parent c46007332a
commit 7b7beb13a3
5 changed files with 71 additions and 64 deletions
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Components/DiskII/DiskII.hpp
+37 -4
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@@ -33,15 +33,48 @@ class DiskII:
public:
DiskII();
void set_register(int address, uint8_t value);
uint8_t get_register(int address);
/// Sets the current external value of the data bus.
void set_data_input(uint8_t input);
/*!
Submits an access to address @c address.
@returns The 8-bit value loaded to the data bus by the DiskII if any;
@c DidNotLoad otherwise.
*/
int read_address(int address);
/*!
The value returned by @c read_address if accessing that address
didn't cause the disk II to place anything onto the bus.
*/
const int DidNotLoad = -1;
/// Advances the controller by @c cycles.
void run_for(const Cycles cycles);
/*!
Supplies the image of the state machine (i.e. P6) ROM,
which dictates how the Disk II will respond to input.
To reduce processing costs, some assumptions are made by
the implementation as to the content of this ROM.
Including:
If Q6 is set and Q7 is reset, the controller is testing
for write protect. If and when the shift register has
become full with the state of the write protect value,
no further processing is required.
*/
void set_state_machine(const std::vector<uint8_t> &);
/// Inserts @c disk into the drive @c drive.
void set_disk(const std::shared_ptr<Storage::Disk::Disk> &disk, int drive);
// As per Sleeper.
bool is_sleeping() override;
// The Disk II functions as a potential target for @c Activity::Sources.
void set_activity_observer(Activity::Observer *observer);
private:
@@ -55,8 +88,6 @@ class DiskII:
void set_control(Control control, bool on);
void set_mode(Mode mode);
void select_drive(int drive);
void set_data_register(uint8_t value);
uint8_t get_shift_register();
uint8_t trigger_address(int address, uint8_t value);
void process_event(const Storage::Disk::Track::Event &event) override;
@@ -78,6 +109,8 @@ class DiskII:
bool motor_is_enabled_ = false;
void set_controller_can_sleep();
uint8_t data_input_ = 0;
};
}