getting conditional branch now

core/broadway/mmio/vi.cpp

@@ -0,0 +1,15 @@
+#include <broadway/mmio/vi.hpp>
+#include "ircolib/log.hpp"
+
+namespace weee::core {
+void video_interface::write(ircolib::u32 addr, ircolib::u16 value) {
+    addr -= 0x0c002000;
+    switch (addr) {
+    case 2:
+        dcr.raw = value;
+        break;
+    default:
+        ircolib::panic("video_interface::write to unimplemented addr 0x{:04X} with value 0x{:04X}", addr, value);
+    }
+}
+} // namespace weee::core

core/broadway/mmio/vi.hpp

@@ -0,0 +1,26 @@
+#pragma once
+#include <ircolib/types.hpp>
+
+namespace weee::core {
+union DCR {
+    struct {
+        unsigned e : 1;
+        unsigned r : 1;
+        unsigned i : 1;
+        unsigned d : 1;
+        unsigned le0 : 2;
+        unsigned le1 : 2;
+        unsigned fmt : 2;
+        unsigned : 6;
+    };
+
+    ircolib::u16 raw;
+};
+
+struct video_interface {
+    void write(ircolib::u32, ircolib::u16);
+
+    private:
+    DCR dcr{};
+};
+} // namespace weee::core