summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/unsp/unsp_fxxx.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/cpu/unsp/unsp_fxxx.cpp')
-rw-r--r--src/devices/cpu/unsp/unsp_fxxx.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/devices/cpu/unsp/unsp_fxxx.cpp b/src/devices/cpu/unsp/unsp_fxxx.cpp
index 2dd1b42bcec..774a726f9a6 100644
--- a/src/devices/cpu/unsp/unsp_fxxx.cpp
+++ b/src/devices/cpu/unsp/unsp_fxxx.cpp
@@ -16,6 +16,10 @@ inline void unsp_device::execute_fxxx_000_group(uint16_t op)
// DS Reg 1 1 1 1 - - - 0 0 0 1 0 w r r r
// FR Reg 1 1 1 1 - - - 0 0 0 1 1 w r r r
+ // FR = 'inner flag register' on ISA1.2+
+ // does this mean 1.2+ do not store the registers in the upper bits of SR, or is this something else?
+ // smartfp IRQ4 reads this and puts in on the stack
+
if (((op & 0xffc0) == 0xfe00) && m_iso >= 12)
{
// ds = imm6