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-rw-r--r--src/devices/cpu/rii/riscii.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/cpu/rii/riscii.cpp b/src/devices/cpu/rii/riscii.cpp
index f8d1b2a914b..7e05eb18055 100644
--- a/src/devices/cpu/rii/riscii.cpp
+++ b/src/devices/cpu/rii/riscii.cpp
@@ -1504,7 +1504,7 @@ void riscii_series_device::execute_inc(u8 reg, bool a)
void riscii_series_device::execute_dec(u8 reg, bool a)
{
u16 addr = get_banked_address(reg);
- u16 tmp = (u16(m_regs->read_byte(addr)) + 0xff) & 0x1ff;
+ u16 tmp = u16(m_regs->read_byte(addr)) + 0xff;
if (a)
acc_w(tmp & 0xff);
else