diff --git a/src/mame/drivers/btime.c b/src/mame/drivers/btime.c
index 00a9a572c4f..c688b05adf9 100644
--- a/src/mame/drivers/btime.c
+++ b/src/mame/drivers/btime.c
@@ -190,7 +190,7 @@ TIMER_DEVICE_CALLBACK_MEMBER(btime_state::audio_nmi_gen)
 
 static ADDRESS_MAP_START( btime_map, AS_PROGRAM, 8, btime_state )
 	AM_RANGE(0x0000, 0x07ff) AM_RAM AM_SHARE("rambase")
-	AM_RANGE(0x0c00, 0x0c0f) AM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
+	AM_RANGE(0x0c00, 0x0c0f) AM_RAM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
 	AM_RANGE(0x1000, 0x13ff) AM_RAM AM_SHARE("videoram")
 	AM_RANGE(0x1400, 0x17ff) AM_RAM AM_SHARE("colorram")
 	AM_RANGE(0x1800, 0x1bff) AM_READWRITE(btime_mirrorvideoram_r, btime_mirrorvideoram_w)
@@ -225,7 +225,7 @@ ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( tisland_map, AS_PROGRAM, 8, btime_state )
 	AM_RANGE(0x0000, 0x07ff) AM_RAM AM_SHARE("rambase")
-	AM_RANGE(0x0c00, 0x0c0f) AM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
+	AM_RANGE(0x0c00, 0x0c0f) AM_RAM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
 	AM_RANGE(0x1000, 0x13ff) AM_RAM AM_SHARE("videoram")
 	AM_RANGE(0x1400, 0x17ff) AM_RAM AM_SHARE("colorram")
 	AM_RANGE(0x1800, 0x1bff) AM_READWRITE(btime_mirrorvideoram_r, btime_mirrorvideoram_w)
@@ -298,10 +298,11 @@ static ADDRESS_MAP_START( bnj_map, AS_PROGRAM, 8, btime_state )
 	AM_RANGE(0x4400, 0x47ff) AM_RAM AM_SHARE("colorram")
 	AM_RANGE(0x4800, 0x4bff) AM_READWRITE(btime_mirrorvideoram_r, btime_mirrorvideoram_w)
 	AM_RANGE(0x4c00, 0x4fff) AM_READWRITE(btime_mirrorcolorram_r, btime_mirrorcolorram_w)
-	AM_RANGE(0x5000, 0x51ff) AM_WRITE(bnj_background_w) AM_SHARE("bnj_bgram")
+	AM_RANGE(0x5000, 0x51ff) AM_RAM_WRITE(bnj_background_w) AM_SHARE("bnj_bgram")
+	AM_RANGE(0x5200, 0x53ff) AM_RAM
 	AM_RANGE(0x5400, 0x5400) AM_WRITE(bnj_scroll1_w)
 	AM_RANGE(0x5800, 0x5800) AM_WRITE(bnj_scroll2_w)
-	AM_RANGE(0x5c00, 0x5c0f) AM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
+	AM_RANGE(0x5c00, 0x5c0f) AM_RAM_WRITE(btime_paletteram_w) AM_SHARE("paletteram")
 	AM_RANGE(0xa000, 0xffff) AM_ROM
 ADDRESS_MAP_END
 
diff --git a/src/mame/includes/btime.h b/src/mame/includes/btime.h
index dd6a794120a..d78dff9aaa7 100644
--- a/src/mame/includes/btime.h
+++ b/src/mame/includes/btime.h
@@ -12,6 +12,7 @@ public:
 		m_rambase(*this, "rambase"),
 		m_videoram(*this, "videoram"),
 		m_colorram(*this, "colorram"),
+		m_paletteram(*this, "paletteram"),
 		m_bnj_backgroundram(*this, "bnj_bgram"),
 		m_zoar_scrollram(*this, "zoar_scrollram"),
 		m_lnc_charbank(*this, "lnc_charbank"),
@@ -24,7 +25,7 @@ public:
 	optional_shared_ptr<UINT8> m_rambase;
 	required_shared_ptr<UINT8> m_videoram;
 	required_shared_ptr<UINT8> m_colorram;
-//  UINT8 *  m_paletteram;    // currently this uses generic palette handling
+	optional_shared_ptr<UINT8> m_paletteram;
 	optional_shared_ptr<UINT8> m_bnj_backgroundram;
 	optional_shared_ptr<UINT8> m_zoar_scrollram;
 	optional_shared_ptr<UINT8> m_lnc_charbank;
diff --git a/src/mame/video/btime.c b/src/mame/video/btime.c
index 99ec46bf746..fab492dde65 100644
--- a/src/mame/video/btime.c
+++ b/src/mame/video/btime.c
@@ -139,6 +139,7 @@ VIDEO_START_MEMBER(btime_state,bnj)
 
 WRITE8_MEMBER(btime_state::btime_paletteram_w)
 {
+	m_paletteram[offset] = data;
 	/* RGB output is inverted */
 	paletteram_BBGGGRRR_byte_w(space, offset, ~data);
 }