Latch and return data direction.

Albeit with no port-handling effect yet.

Components/6526/6526.hpp

@@ -11,6 +11,8 @@
 
 #include <cstdint>
 
+#include "Implementation/6526Storage.hpp"
+
 namespace MOS {
 namespace MOS6526 {
 
@@ -25,7 +27,9 @@ enum class Personality {
 	P8250,
 };
 
-template <typename PortHandlerT, Personality personality> class MOS6526 {
+template <typename PortHandlerT, Personality personality> class MOS6526:
+	private MOS6526Storage
+{
 	public:
 		MOS6526(PortHandlerT &port_handler) noexcept : port_handler_(port_handler) {}
 		MOS6526(const MOS6526 &) = delete;

Components/6526/Implementation/6526Implementation.hpp

@@ -18,15 +18,31 @@ namespace MOS6526 {
 template <typename BusHandlerT, Personality personality>
 void MOS6526<BusHandlerT, personality>::write(int address, uint8_t value) {
 	address &= 0xf;
+	switch(address) {
+		case 2: case 3:
+			registers_.data_direction[address - 2] = value;
+		break;
+
+		default:
 			printf("Unhandled 6526 write: %02x to %d\n", value, address);
 			assert(false);
+		break;
+	}
 }
 
 template <typename BusHandlerT, Personality personality>
 uint8_t MOS6526<BusHandlerT, personality>::read(int address) {
 	address &= 0xf;
+	switch(address) {
+		case 2: case 3:
+			return registers_.data_direction[address - 2];
+		break;
+
+		default:
 			printf("Unhandled 6526 read from %d\n", address);
 			assert(false);
+		break;
+	}
 	return 0xff;
 }
 

Components/6526/Implementation/6526Storage.hpp

@@ -0,0 +1,28 @@
+//
+//  6526Storage.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 18/07/2021.
+//  Copyright © 2021 Thomas Harte. All rights reserved.
+//
+
+#ifndef _526Storage_h
+#define _526Storage_h
+
+namespace MOS {
+namespace MOS6526 {
+
+struct MOS6526Storage {
+
+	struct Registers {
+		uint8_t output[2] = {0, 0};
+		uint8_t input[2] = {0, 0};
+		uint8_t data_direction[2] = {0, 0};
+	} registers_;
+
+};
+
+}
+}
+
+#endif /* _526Storage_h */

OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj

@@ -1922,6 +1922,7 @@
 		4BC080D826A25ADA00D03FD8 /* Amiga.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Amiga.cpp; sourceTree = "<group>"; };
 		4BC080DE26A481C100D03FD8 /* 6526.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = 6526.hpp; sourceTree = "<group>"; };
 		4BC080E026A481C100D03FD8 /* 6526Implementation.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = 6526Implementation.hpp; sourceTree = "<group>"; };
+		4BC080E126A48BCC00D03FD8 /* 6526Storage.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = 6526Storage.hpp; sourceTree = "<group>"; };
 		4BC0CB272446BC7B00A79DBB /* OPLTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = OPLTests.mm; sourceTree = "<group>"; };
 		4BC1316D2346DE5000E4FF3D /* StaticAnalyser.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = StaticAnalyser.hpp; sourceTree = "<group>"; };
 		4BC1316E2346DE5000E4FF3D /* Target.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Target.hpp; sourceTree = "<group>"; };
@@ -4282,6 +4283,7 @@
 			isa = PBXGroup;
 			children = (
 				4BC080E026A481C100D03FD8 /* 6526Implementation.hpp */,
+				4BC080E126A48BCC00D03FD8 /* 6526Storage.hpp */,
 			);
 			path = Implementation;
 			sourceTree = "<group>";