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Ensures the Master System is informed when it should pretend to be an SG1000.

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This commit is contained in:
Thomas Harte
2018-09-23 16:34:47 -04:00
parent f59386f523
commit 00b2db4fb9
4 changed files with 55 additions and 4 deletions
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Machines/MasterSystem/MasterSystem.cpp
+11 -4
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@@ -20,6 +20,8 @@
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../../Analyser/Static/Sega/Target.hpp"
namespace {
const int sn76489_divider = 2;
}
@@ -33,7 +35,7 @@ class ConcreteMachine:
public CRTMachine::Machine {
public:
ConcreteMachine(const Analyser::Static::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
ConcreteMachine(const Analyser::Static::Sega::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
z80_(*this),
sn76489_(TI::SN76489::Personality::SMS, audio_queue_, sn76489_divider),
speaker_(sn76489_) {
@@ -104,17 +106,18 @@ class ConcreteMachine:
break;
case CPU::Z80::PartialMachineCycle::Input:
printf("Input %04x\n", address);
*cycle.value = 0xff;
switch(address & 0xc1) {
case 0x00:
printf("TODO: memory control\n");
*cycle.value = 0xff;
break;
case 0x01:
printf("TODO: I/O port control\n");
*cycle.value = 0xff;
break;
case 0x40: case 0x41:
printf("TODO: get current line\n");
*cycle.value = 0xff;
break;
case 0x80: case 0x81:
update_video();
@@ -124,9 +127,11 @@ class ConcreteMachine:
break;
case 0xc0:
printf("TODO: I/O port A/N\n");
*cycle.value = 0;
break;
case 0xc1:
printf("TODO: I/O port B/misc\n");
*cycle.value = 0;
break;
default:
@@ -219,7 +224,9 @@ class ConcreteMachine:
using namespace Sega::MasterSystem;
Machine *Machine::MasterSystem(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
return new ConcreteMachine(*target, rom_fetcher);
using Target = Analyser::Static::Sega::Target;
const Target *const sega_target = dynamic_cast<const Target *>(target);
return new ConcreteMachine(*sega_target, rom_fetcher);
}
Machine::~Machine() {}