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Diffstat (limited to 'src/mame/drivers/cop01.cpp')
-rw-r--r--src/mame/drivers/cop01.cpp23
1 files changed, 21 insertions, 2 deletions
diff --git a/src/mame/drivers/cop01.cpp b/src/mame/drivers/cop01.cpp
index e6ebcd6b94b..1a437c7eceb 100644
--- a/src/mame/drivers/cop01.cpp
+++ b/src/mame/drivers/cop01.cpp
@@ -170,6 +170,25 @@ static ADDRESS_MAP_START( audio_io_map, AS_IO, 8, cop01_state )
ADDRESS_MAP_END
+/*
+ * sound "protection" uses address/data to ports 2/3 (R/W)
+ * Register map:
+ * 0x32: always 5, dac transfer trigger?
+ * 0x33: - address 1 (source?)
+ * 0x34: /
+ * 0x35: - address 2 (size?)
+ * 0x36: /
+ * 0x37: R reused for ym3526 register set
+ *
+ * 0x40: counter set, always 1?
+ * 0x41: R bit 0 pulse timer? W oneshot timer?
+ * 0x42: counter set, always 3?
+ * 0x43: counter set, always 3?
+ *
+ * 0x92: data in/out (for dac?)
+ * 0x94: test register? (W 0xaa, checks if R 0xaa)
+ */
+
/* this just gets some garbage out of the YM3526 */
READ8_MEMBER(cop01_state::kludge)
{
@@ -179,8 +198,8 @@ READ8_MEMBER(cop01_state::kludge)
static ADDRESS_MAP_START( mightguy_audio_io_map, AS_IO, 8, cop01_state )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x01) AM_DEVWRITE("ymsnd", ym3526_device, write)
- AM_RANGE(0x02, 0x02) AM_WRITENOP /* 1412M2? */
- AM_RANGE(0x03, 0x03) AM_WRITENOP /* 1412M2? */
+ AM_RANGE(0x02, 0x02) AM_WRITENOP /* 1412M2 address? */
+ AM_RANGE(0x03, 0x03) AM_WRITENOP /* 1412M2 data? */
AM_RANGE(0x03, 0x03) AM_READ(kludge) /* 1412M2? */
AM_RANGE(0x06, 0x06) AM_READ(cop01_sound_command_r)
ADDRESS_MAP_END