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With a very basic stab at something a bit like the memory map (sans paging), execution begins.

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This commit is contained in:
Thomas Harte
2017-07-31 19:15:43 -04:00
parent afd409c883
commit 3c90218c3d
2 changed files with 43 additions and 0 deletions
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40
Machines/AmstradCPC/AmstradCPC.cpp
View File

@@ -20,6 +20,40 @@ HalfCycles Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &c
clock_offset_ = (clock_offset_ + cycle.length) & HalfCycles(7); clock_offset_ = (clock_offset_ + cycle.length) & HalfCycles(7);
set_wait_line(clock_offset_ >= HalfCycles(2)); set_wait_line(clock_offset_ >= HalfCycles(2));
// Stop now if no action is strictly required.
if(!cycle.is_terminal()) return HalfCycles(0);
uint16_t address = cycle.address ? *cycle.address : 0x0000;
switch(cycle.operation) {
case CPU::Z80::PartialMachineCycle::ReadOpcode:
case CPU::Z80::PartialMachineCycle::Read:
switch(address >> 14) {
case 0: *cycle.value = os_[address & 16383]; break;
case 1: case 2:
*cycle.value = ram_[address];
break;
case 3: *cycle.value = basic_[address & 16383]; break;
}
break;
case CPU::Z80::PartialMachineCycle::Write:
ram_[address] = *cycle.value;
break;
case CPU::Z80::PartialMachineCycle::Output:
printf("Output %02x -> %04x?\n", *cycle.value, address);
break;
case CPU::Z80::PartialMachineCycle::Input:
printf("Input %04x?\n", address);
break;
case CPU::Z80::PartialMachineCycle::Interrupt:
*cycle.value = 0xff;
break;
default: break;
}
return HalfCycles(0); return HalfCycles(0);
} }
@@ -27,6 +61,12 @@ void Machine::flush() {
} }
void Machine::set_rom(ROMType type, std::vector<uint8_t> data) { void Machine::set_rom(ROMType type, std::vector<uint8_t> data) {
// Keep only the two ROMs that are currently of interest.
switch(type) {
case ROMType::OS464: os_ = data; break;
case ROMType::BASIC464: basic_ = data; break;
default: break;
}
} }
void Machine::setup_output(float aspect_ratio) { void Machine::setup_output(float aspect_ratio) {

3
Machines/AmstradCPC/AmstradCPC.hpp
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@@ -48,6 +48,9 @@ class Machine:
private: private:
std::shared_ptr<Outputs::CRT::CRT> crt_; std::shared_ptr<Outputs::CRT::CRT> crt_;
HalfCycles clock_offset_; HalfCycles clock_offset_;
uint8_t ram_[65536];
std::vector<uint8_t> os_, basic_;
}; };
} }