diff --git a/src/operations.cpp b/src/operations.cpp
index 70201d3..2cbe3f3 100644
--- a/src/operations.cpp
+++ b/src/operations.cpp
@@ -9,6 +9,8 @@ namespace N64Recomp {
         { InstrId::cpu_mflo, { UnaryOpType::None, Operand::Rd, Operand::Lo } },
         { InstrId::cpu_mtc1, { UnaryOpType::None, Operand::FsU32L, Operand::Rt } },
         { InstrId::cpu_mfc1, { UnaryOpType::ToInt32, Operand::Rt, Operand::FsU32L } },
+        { InstrId::cpu_dmtc1, { UnaryOpType::None, Operand::FsU64, Operand::Rt } },
+        { InstrId::cpu_dmfc1, { UnaryOpType::None, Operand::Rt, Operand::FsU64 } },
         // Float operations
         { InstrId::cpu_mov_s,     { UnaryOpType::None,           Operand::Fd,       Operand::Fs,       true } },
         { InstrId::cpu_mov_d,     { UnaryOpType::None,           Operand::FdDouble, Operand::FsDouble, true } },
diff --git a/src/symbol_lists.cpp b/src/symbol_lists.cpp
index cbe5ff5..9703fca 100644
--- a/src/symbol_lists.cpp
+++ b/src/symbol_lists.cpp
@@ -58,6 +58,7 @@ const std::unordered_set<std::string> N64Recomp::reimplemented_funcs {
     // Parallel interface (cartridge, DMA, etc.) functions
     "osCartRomInit",
     "osCreatePiManager",
+    "osPiReadIo",
     "osPiStartDma",
     "osEPiStartDma",
     "osPiGetStatus",
@@ -268,7 +269,7 @@ const std::unordered_set<std::string> N64Recomp::ignored_funcs {
     "__osDevMgrMain",
     "osPiGetCmdQueue",
     "osPiGetStatus",
-    "osPiReadIo",
+    //"osPiReadIo",
     "osPiStartDma",
     "osPiWriteIo",
     "osEPiGetDeviceType",