diff --git a/src/devices/video/v9938.cpp b/src/devices/video/v9938.cpp
index aec5835f4a0..6a24e97f7d4 100644
--- a/src/devices/video/v9938.cpp
+++ b/src/devices/video/v9938.cpp
@@ -241,14 +241,14 @@ void v99x8_device::set_screen_parameters()
 	}
 	else
 	{
-		// NYSC
+		// NTSC
 		m_scanline_start = (m_cont_reg[9] & 0x80) ? 16 : 26;
 		m_scanline_max = (m_cont_reg[9] & 0x80) ? 234 : 244;
 	}
 	m_visible_y = (m_cont_reg[9] & 0x80) ? 212 : 192;
 }
 
-
+// FIXME: this doesn't really allow for external clock configuration
 void v99x8_device::configure_pal_ntsc()
 {
 	if (m_pal_ntsc)
@@ -692,6 +692,7 @@ void v99x8_device::device_reset()
 	m_cmd_write_first = m_pal_write_first = 0;
 	m_int_state = 0;
 	m_read_ahead = 0; m_address_latch = 0; // ???
+	// FIXME: this drifts the scanline number wrt screen h/vpos
 	m_scanline = 0;
 	// MZ: The status registers 4 and 6 hold the high bits of the sprite
 	// collision location. The unused bits are set to 1.
@@ -810,6 +811,7 @@ void v99x8_device::check_int()
 	** called; because of this Mr. Ghost, Xevious and SD Snatcher don't
 	** run. As a patch it's called every scanline
 	*/
+	// FIXME: breaks nichibutsu hrdvd.cpp & nichild.cpp, really needs INPUT_MERGER instead.
 	m_int_callback(n);
 }