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Diffstat (limited to 'src/emu/cpu/ucom4/ucom4op.inc')
-rw-r--r-- | src/emu/cpu/ucom4/ucom4op.inc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/emu/cpu/ucom4/ucom4op.inc b/src/emu/cpu/ucom4/ucom4op.inc index 05abd2f4a49..6c6faddeae5 100644 --- a/src/emu/cpu/ucom4/ucom4op.inc +++ b/src/emu/cpu/ucom4/ucom4op.inc @@ -713,6 +713,9 @@ void ucom4_cpu_device::op_stm() // STM X: Reset Timer F/F, Start Timer with X op_illegal(); + + if ((m_arg & 0xc0) != 0x80) + logerror("%s STM opcode unexpected upper arg $%02X at $%03X\n", tag(), m_arg & 0xc0, m_pc); } void ucom4_cpu_device::op_ttm() |