1 files changed, 41 insertions, 0 deletions
diff --git a/io.hpp b/io.hpp
new file mode 100644
index 0000000..de2478a
--- /dev/null
+++ b/io.hpp
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: Unlicense
+ */
+
+#pragma once
+
+#include "bus.hpp"
+
+class IO {
+public:
+    constexpr IO(const uint32_t base_address_a): base_address(base_address_a) {}
+    uint32_t Read(uint32_t offset, enum bitness);
+    void Write(uint32_t offset, enum bitness, uint32_t value);
+    const uint32_t base_address;
+    constexpr static uint32_t kData1Offset = 0x3;
+    constexpr static uint32_t kData2Offset = 0x5;
+    constexpr static uint32_t kData3Offset = 0x7;
+    constexpr static uint32_t kControl1Offset = 0x9;
+    constexpr static uint32_t kControl2Offset = 0xb;
+    constexpr static uint32_t kControl3Offset = 0xd;
+    constexpr static uint32_t kTx1Offset = 0xf;
+    constexpr static uint32_t kRx1Offset = 0x11;
+    constexpr static uint32_t kStatus1Offset = 0x13;
+    constexpr static uint32_t kTx2Offset = 0x15;
+    constexpr static uint32_t kRx2Offset = 0x17;
+    constexpr static uint32_t kStatus2Offset = 0x19;
+    constexpr static uint32_t kTx3Offset = 0x1b;
+    constexpr static uint32_t kRx3Offset = 0x1d;
+    constexpr static uint32_t kStatus3Offset = 0x1f;
+    constexpr static uint32_t kZ80BusReq = 0x1100;
+    constexpr static uint32_t kZ80Reset = 0x1200;
+private:
+    uint32_t read(uint32_t offset);
+    void write(uint32_t offset, uint8_t value);
+    uint8_t _control1{}, _control2{}, _control3{};
+    uint8_t _data1{}, _data2{}, _data3{};
+    uint8_t _tx1{}, _rx1{}, _status1{};
+    uint8_t _tx2{}, _rx2{}, _status2{};
+    uint8_t _tx3{}, _rx3{}, _status3{};
+    bool _z80_reset{};
+    bool _z80_busreq{};
+};