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-rw-r--r--src/devices/cpu/mcs48/mcs48.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/devices/cpu/mcs48/mcs48.cpp b/src/devices/cpu/mcs48/mcs48.cpp
index 96334465e10..b0f7e4f9fb5 100644
--- a/src/devices/cpu/mcs48/mcs48.cpp
+++ b/src/devices/cpu/mcs48/mcs48.cpp
@@ -15,6 +15,8 @@
- add special 8022 opcodes (RAD, SEL AN0, SEL AN1, RETI)
- according to the user manual, some opcodes(dis/enable timer/interrupt)
don't increment the timer, does it affect the prescaler too?
+ Most likely, timer input (prescaler overflow or T1 edge) still occurs,
+ just that m_timer increment is delayed 1 opcode.
- IRQ timing is hacked due to WY-100 needing to take JNI branch before servicing interrupt
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