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Added what may be correct paging logic.

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This commit is contained in:
Thomas Harte 2016-11-22 22:09:52 +08:00
parent 363db695e8
commit 13a608a8c2
2 changed files with 28 additions and 4 deletions
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18
Machines/Oric/Microdisc.cpp
View File

@ -10,7 +10,10 @@
using namespace Oric;
Microdisc::Microdisc() : irq_enable_(false)
Microdisc::Microdisc() :
irq_enable_(false),
delegate_(nullptr),
paging_flags_(BASICDisable)
{}
void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive)
@ -25,9 +28,7 @@ void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive)
void Microdisc::set_control_register(uint8_t control)
{
// b7: EPROM select (0 = select)
// b2: data separator clock rate select (1 = double)
// b1: ROM disable (0 = disable)
// b2: data separator clock rate select (1 = double) [TODO]
// b65: drive select
selected_drive_ = (control >> 5)&3;
@ -44,6 +45,15 @@ void Microdisc::set_control_register(uint8_t control)
// b0: IRQ enable
irq_enable_ = !(control & 0x01);
// b7: EPROM select (0 = select)
// b1: ROM disable (0 = disable)
int new_paging_flags = ((control & 0x01) ? BASICDisable : 0) | ((control & 0x80) ? 0 : MicrodscDisable);
if(new_paging_flags != paging_flags_)
{
paging_flags_ = new_paging_flags;
if(delegate_) delegate_->microdisc_did_change_paging_flags(this);
}
}
bool Microdisc::get_interrupt_request_line()

14
Machines/Oric/Microdisc.hpp
View File

@ -24,10 +24,24 @@ class Microdisc: public WD::WD1770 {
bool get_interrupt_request_line();
enum PagingFlags {
BASICDisable = (1 << 0),
MicrodscDisable = (1 << 1)
};
class Delegate {
public:
virtual void microdisc_did_change_paging_flags(Microdisc *microdisc) = 0;
};
inline void set_microdisc_delegate(Delegate *delegate) { delegate_ = delegate; }
inline int get_paging_flags() { return paging_flags_; }
private:
std::shared_ptr<Storage::Disk::Drive> drives_[4];
int selected_drive_;
bool irq_enable_;
int paging_flags_;
Delegate *delegate_;
};
}