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-rw-r--r--src/devices/cpu/sm510/sm511core.cpp11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/devices/cpu/sm510/sm511core.cpp b/src/devices/cpu/sm510/sm511core.cpp
index d2e911b02dd..04f3cdfee24 100644
--- a/src/devices/cpu/sm510/sm511core.cpp
+++ b/src/devices/cpu/sm510/sm511core.cpp
@@ -3,6 +3,13 @@
/*
Sharp SM511 MCU core implementation
+
+ TODO:
+ - undocumented/guessed opcodes:
+ * $01 is guessed as DIV to ACC transfer, unknown which bits
+ * $5d is certainly CEND
+ * $65 is certainly divider reset, but not sure if it behaves same as on SM510
+ * $6036 and $6037 may be instruction timing? (16kHz and 8kHz), mnemonics unknown
*/
@@ -12,8 +19,8 @@
// MCU types
-DEFINE_DEVICE_TYPE(SM511, sm511_device, "sm511", "SM511")
-DEFINE_DEVICE_TYPE(SM512, sm512_device, "sm512", "SM512")
+DEFINE_DEVICE_TYPE(SM511, sm511_device, "sm511", "SM511") // 4Kx8 ROM, 128x4 RAM(32x4 for LCD), melody controller
+DEFINE_DEVICE_TYPE(SM512, sm512_device, "sm512", "SM512") // 4Kx8 ROM, 128x4 RAM(48x4 for LCD), melody controller
// internal memory maps