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-rw-r--r--src/mame/drivers/alpha68k_n.cpp13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/mame/drivers/alpha68k_n.cpp b/src/mame/drivers/alpha68k_n.cpp
index 04960429bf5..4d000571333 100644
--- a/src/mame/drivers/alpha68k_n.cpp
+++ b/src/mame/drivers/alpha68k_n.cpp
@@ -53,6 +53,19 @@ Notes:
The chip is pin-compatible with Motorola MC68705U3, Motorola MC6805U2
and Hitachi HD6805U1. The 4k MC68705U3 dump in MAME is from a bootleg PCB.
+Note from Guru: The bootleg 4k MCU dump was written to a genuine
+Motorola MC68705U3 microcontroller and tested on the original Alpha
+Denshi Kyros no Yakata PCB and works. Since the bootleg PCB is
+visually the same this suggests the bootleggers copied the PCB 1:1
+including the HD6805U1 MCU data then adapted it for the 68705U3 with
+minimal changes.
+*******************************
+romcmp -d *.bin
+Comparing 2 files....
+kyros_68705u3.bin [3/4] kyros_mcu.bin [1/2] 99.902344%
+kyros_68705u3.bin [4/4] kyros_mcu.bin [2/2] 88.183594%
+*******************************
+
Sound Board
-----------