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Mockingboard: start sketching out intermediate clocking.

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This commit is contained in:
Thomas Harte 2024-01-23 22:05:30 -05:00
parent f5800aa004
commit 15b5a62e01
3 changed files with 71 additions and 26 deletions
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6
Analyser/Static/AppleII/Target.hpp
View File

@ -34,12 +34,14 @@ struct Target: public Analyser::Static::Target, public Reflection::StructImpl<Ta
Model model = Model::IIe;
DiskController disk_controller = DiskController::None;
SCSIController scsi_controller = SCSIController::None;
bool has_mockingboard = false;
Target() : Analyser::Static::Target(Machine::AppleII) {
if(needs_declare()) {
DeclareField(model);
DeclareField(disk_controller);
DeclareField(scsi_controller);
DeclareField(has_mockingboard);
AnnounceEnum(Model);
AnnounceEnum(DiskController);
@ -48,4 +50,8 @@ struct Target: public Analyser::Static::Target, public Reflection::StructImpl<Ta
}
};
constexpr bool is_iie(Target::Model model) {
return model == Target::Model::IIe || model == Target::Model::EnhancedIIe;
}
}

2
Components/AY38910/AY38910.hpp
View File

@ -105,7 +105,7 @@ template <bool is_stereo> class AY38910: public ::Outputs::Speaker::SampleSource
*/
void set_output_mixing(float a_left, float b_left, float c_left, float a_right = 1.0, float b_right = 1.0, float c_right = 1.0);
// to satisfy ::Outputs::Speaker (included via ::Outputs::Filter.
// To satisfy ::Outputs::Speaker::SampleSource.
void get_samples(std::size_t number_of_samples, int16_t *target);
bool is_zero_level() const;
void set_sample_volume_range(std::int16_t range);

85
Machines/Apple/AppleII/AppleII.cpp
View File

@ -43,14 +43,55 @@ namespace {
constexpr int DiskIISlot = 6; // Apple recommended slot 6 for the (first) Disk II.
constexpr int SCSISlot = 7; // Install the SCSI card in slot 7, to one-up any connected Disk II.
constexpr int MockingboardSlot = 4; // Conventional Mockingboard slot.
// The system's master clock rate.
//
// Quick note on this:
//
// * 64 out of 65 CPU cycles last for 14 cycles of the master clock;
// * every 65th cycle lasts for 16 cycles of the master clock;
// * that keeps CPU cycles in-phase with the colour subcarrier: each line of output is 64*14 + 16 = 912 master cycles long;
// * ... and since hsync is placed to make each line 228 colour clocks long that means 4 master clocks per colour clock;
// * ... which is why all Apple II video modes are expressible as four binary outputs per colour clock;
// * ... and hence seven pixels per memory access window clock in high-res mode, 14 in double high-res, etc.
constexpr float master_clock = 14318180.0;
template <typename SourceT>
class StretchedAudioSource {
public:
void get_samples(std::size_t number_of_samples, int16_t *target) {
// Approach should look something like — assuming a fully digital source_:
//
// (1) sample_offset_ is always kept in the range [0, 912);
// (2) break down sample generation into 912-cycle blocks, getting the underlying source to provide
// the first 910 samples in each, then duplicate the final two.
//
// (possibly subject to an appropriate divider, with 'by two' being the obvious potential choice)
(void)number_of_samples;
(void)target;
}
// Direct passthroughs.
void set_sample_volume_range(std::int16_t range) {
source_.set_sample_volume_range(range);
}
bool is_zero_level() const { return source_.is_zero_level(); }
static constexpr bool get_is_stereo() { return SourceT::get_is_stereo(); }
private:
SourceT source_;
std::size_t sample_offset_ = 0;
static constexpr std::size_t clock_length = 7;
};
}
namespace Apple {
namespace II {
#define is_iie() ((model == Analyser::Static::AppleII::Target::Model::IIe) || (model == Analyser::Static::AppleII::Target::Model::EnhancedIIe))
template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
public Apple::II::Machine,
public MachineTypes::TimedMachine,
@ -83,7 +124,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
false>;
Processor m6502_;
VideoBusHandler video_bus_handler_;
Apple::II::Video::Video<VideoBusHandler, is_iie()> video_;
Apple::II::Video::Video<VideoBusHandler, is_iie(model)> video_;
int cycles_into_current_line_ = 0;
Cycles cycles_since_video_update_;
@ -225,7 +266,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
const auto zero_state = auxiliary_switches_.zero_state();
uint8_t *const ram = zero_state ? aux_ram_ : ram_;
uint8_t *const rom = is_iie() ? &rom_[3840] : rom_.data();
uint8_t *const rom = is_iie(model) ? &rom_[3840] : rom_.data();
// Which way the region here is mapped to be banks 1 and 2 is
// arbitrary.
@ -286,7 +327,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
}
bool set_key_pressed(Key key, char value, bool is_pressed, bool is_repeat) final {
if constexpr (!is_iie()) {
if constexpr (!is_iie(model)) {
if(is_repeat && !repeat_is_pressed_) return true;
}
@ -297,7 +338,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
case Key::Down: value = 0x0a; break;
case Key::Up: value = 0x0b; break;
case Key::Backspace:
if(is_iie()) {
if(is_iie(model)) {
value = 0x7f;
break;
} else {
@ -305,7 +346,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
}
case Key::Enter: value = 0x0d; break;
case Key::Tab:
if (is_iie()) {
if (is_iie(model)) {
value = '\t';
break;
} else {
@ -316,7 +357,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
case Key::LeftOption:
case Key::RightMeta:
if (is_iie()) {
if (is_iie(model)) {
open_apple_is_pressed = is_pressed;
return true;
} else {
@ -325,7 +366,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
case Key::RightOption:
case Key::LeftMeta:
if (is_iie()) {
if (is_iie(model)) {
closed_apple_is_pressed = is_pressed;
return true;
} else {
@ -346,7 +387,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
case Key::F9: case Key::F10: case Key::F11:
repeat_is_pressed_ = is_pressed;
if constexpr (!is_iie()) {
if constexpr (!is_iie(model)) {
if(is_pressed && (!is_repeat || character_is_pressed_)) {
keyboard_input_ = uint8_t(last_pressed_character_ | 0x80);
}
@ -374,12 +415,12 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
}
// Prior to the IIe, the keyboard could produce uppercase only.
if(!is_iie()) value = char(toupper(value));
if(!is_iie(model)) value = char(toupper(value));
if(control_is_pressed_ && isalpha(value)) value &= 0xbf;
// TODO: properly map IIe keys
if(!is_iie() && shift_is_pressed_) {
if(!is_iie(model) && shift_is_pressed_) {
switch(value) {
case 0x27: value = 0x22; break; // ' -> "
case 0x2c: value = 0x3c; break; // , -> <
@ -484,8 +525,6 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
language_card_(*this),
auxiliary_switches_(*this),
keyboard_(&m6502_) {
// The system's master clock rate.
constexpr float master_clock = 14318180.0;
// This is where things get slightly convoluted: establish the machine as having a clock rate
// equal to the number of cycles of work the 6502 will actually achieve. Which is less than
@ -629,7 +668,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
if(write_pages_[address >> 8]) write_pages_[address >> 8][address & 0xff] = *value;
}
if(is_iie()) {
if(is_iie(model)) {
auxiliary_switches_.access(address, isReadOperation(operation));
}
} else {
@ -669,7 +708,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
*value &= 0x7f;
if(
joysticks_.button(0) ||
(is_iie() && keyboard_.open_apple_is_pressed)
(is_iie(model) && keyboard_.open_apple_is_pressed)
)
*value |= 0x80;
break;
@ -677,7 +716,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
*value &= 0x7f;
if(
joysticks_.button(1) ||
(is_iie() && keyboard_.closed_apple_is_pressed)
(is_iie(model) && keyboard_.closed_apple_is_pressed)
)
*value |= 0x80;
break;
@ -699,7 +738,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
} break;
// The IIe-only state reads follow...
#define IIeSwitchRead(s) *value = keyboard_.get_keyboard_input(); if(is_iie()) *value = (*value & 0x7f) | (s ? 0x80 : 0x00);
#define IIeSwitchRead(s) *value = keyboard_.get_keyboard_input(); if(is_iie(model)) *value = (*value & 0x7f) | (s ? 0x80 : 0x00);
case 0xc011: IIeSwitchRead(language_card_.state().bank2); break;
case 0xc012: IIeSwitchRead(language_card_.state().read); break;
case 0xc013: IIeSwitchRead(auxiliary_switches_.switches().read_auxiliary_memory); break;
@ -718,12 +757,12 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
#undef IIeSwitchRead
case 0xc07f:
if(is_iie()) *value = (*value & 0x7f) | (video_.get_annunciator_3() ? 0x80 : 0x00);
if(is_iie(model)) *value = (*value & 0x7f) | (video_.get_annunciator_3() ? 0x80 : 0x00);
break;
}
} else {
// Write-only switches. All IIe as currently implemented.
if(is_iie()) {
if(is_iie(model)) {
auxiliary_switches_.access(address, false);
switch(address) {
default: break;
@ -775,7 +814,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
case 0xc05e:
case 0xc05f:
if(is_iie()) {
if(is_iie(model)) {
update_video();
video_.set_annunciator_3(!(address&1));
}
@ -785,7 +824,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
keyboard_.clear_keyboard_input();
// On the IIe, reading C010 returns additional key info.
if(is_iie() && isReadOperation(operation)) {
if(is_iie(model) && isReadOperation(operation)) {
*value = (keyboard_.get_key_is_down() ? 0x80 : 0x00) | (keyboard_.get_keyboard_input() & 0x7f);
}
break;
@ -922,7 +961,7 @@ template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
}
bool prefers_logical_input() final {
return is_iie();
return is_iie(model);
}
Inputs::Keyboard &get_keyboard() final {