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Add RAM.

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This commit is contained in:
Thomas Harte 2023-12-25 14:35:24 -05:00
parent a15d4610f7
commit 0537e59486
1 changed files with 13 additions and 2 deletions
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15
Machines/PCCompatible/RTC.hpp
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@ -35,6 +35,9 @@ class RTC {
switch(selected_) { switch(selected_) {
default: default:
if(ram_selected()) {
return ram_[ram_address()];
}
return 0xff; return 0xff;
case 0x00: return bcd(time_date->tm_sec); // Seconds [0-59] case 0x00: return bcd(time_date->tm_sec); // Seconds [0-59]
@ -63,7 +66,8 @@ class RTC {
} }
private: private:
int selected_; std::size_t selected_;
std::array<uint8_t, 50> ram_{};
uint8_t statusA_ = 0x00; uint8_t statusA_ = 0x00;
uint8_t statusB_ = 0x02; uint8_t statusB_ = 0x02;
@ -71,6 +75,9 @@ class RTC {
bool is_decimal() const { return statusB_ & 0x04; } bool is_decimal() const { return statusB_ & 0x04; }
bool is_24hour() const { return statusB_ & 0x02; } bool is_24hour() const { return statusB_ & 0x02; }
bool ram_selected() const { return selected_ >= 0xe && selected_ < 0xe + ram_.size(); }
std::size_t ram_address() const { return selected_ - 0xe; }
template <typename IntT> template <typename IntT>
uint8_t bcd(IntT input) { uint8_t bcd(IntT input) {
// If calendar is in binary format, don't convert. // If calendar is in binary format, don't convert.
@ -87,7 +94,11 @@ class RTC {
void write_register(uint8_t value) { void write_register(uint8_t value) {
switch(selected_) { switch(selected_) {
default: break; default:
if(ram_selected()) {
ram_[ram_address()] = value;
}
break;
case 0x0a: statusA_ = value; break; case 0x0a: statusA_ = value; break;
case 0x0b: statusB_ = value; break; case 0x0b: statusB_ = value; break;
} }