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Diffstat (limited to 'src/devices/cpu/tms1000/tms0980.cpp')
-rw-r--r--src/devices/cpu/tms1000/tms0980.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/cpu/tms1000/tms0980.cpp b/src/devices/cpu/tms1000/tms0980.cpp
index 5ebc720a6f7..664adb877ed 100644
--- a/src/devices/cpu/tms1000/tms0980.cpp
+++ b/src/devices/cpu/tms1000/tms0980.cpp
@@ -163,7 +163,7 @@ void tms0980_cpu_device::read_opcode()
{
debugger_instruction_hook(m_rom_address);
m_opcode = m_program->read_word(m_rom_address) & 0x1ff;
- m_c4 = bitswap<8>(m_opcode,7,6,5,4,0,1,2,3) & 0xf; // opcode operand is bitswapped for most opcodes
+ m_c4 = bitswap<4>(m_opcode,0,1,2,3); // opcode operand is bitswapped for most opcodes
m_fixed = m_fixed_decode[m_opcode];
m_micro = read_micro();