diff --git a/src/mame/drivers/dkong.cpp b/src/mame/drivers/dkong.cpp
index 94914192c9b..5314107fa8f 100644
--- a/src/mame/drivers/dkong.cpp
+++ b/src/mame/drivers/dkong.cpp
@@ -1880,7 +1880,7 @@ MACHINE_CONFIG_END
  *
  *************************************/
 
-ROM_START( radarscp )
+ROM_START( radarscp ) /* unclear which boardset this comes from; there existed a 5 pcb stack with trs-03 (no voice) sound board on top, and a 4 board as well as a 2 board pcb stack */
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "trs2c5fc",     0x0000, 0x1000, CRC(40949e0d) SHA1(94717b9d027600e25b863e89900df41325875961) )
 	ROM_LOAD( "trs2c5gc",     0x1000, 0x1000, CRC(afa8c49f) SHA1(25880e9dcf2dc8862f7f3c38687f01dfe2424293) )
@@ -1913,7 +1913,7 @@ ROM_START( radarscp )
 	ROM_LOAD( "rs2-v.1hc",    0x0200, 0x0100, CRC(1b828315) SHA1(00c9f8c5ae86b68d38c66f9071b5f1ef421c1005) ) /* character color codes on a per-column basis */
 ROM_END
 
-ROM_START( radarscp1 )
+ROM_START( radarscp1 ) /* TRS01 5-pcb stack with TRS01 "Voice" pcb on top containing the sound cpu and the m58817 speech chip and the m58819 speech serial rom emulator chip */
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "trs01_5f",     0x0000, 0x1000, CRC(40949e0d) SHA1(94717b9d027600e25b863e89900df41325875961) )
 	ROM_LOAD( "trs01_5g",     0x1000, 0x1000, CRC(afa8c49f) SHA1(25880e9dcf2dc8862f7f3c38687f01dfe2424293) )
@@ -1922,12 +1922,12 @@ ROM_START( radarscp1 )
 	/* space for diagnostic ROM */
 
 	ROM_REGION( 0x1800, "soundcpu", 0 ) /* sound */
-	ROM_LOAD( "trs015aa.bin", 0x0000, 0x0800, CRC(5166554c) SHA1(00bf501ca448929f6187598da6fdbc1ea488745a) )
+	ROM_LOAD( "trs-s__5a.5a", 0x0000, 0x0800, CRC(5166554c) SHA1(00bf501ca448929f6187598da6fdbc1ea488745a) ) // 5A on the 'voice' board on top of the 5-pcb stack; eprom label is "TRS-S ['S' overstrikes a '1'] // 5A [stamped '8' or 'a' in red ink]"
 	ROM_RELOAD(               0x0800, 0x0800 )
 	ROM_FILL(                 0x1000, 0x0800, 0xFF )
 
 	ROM_REGION( 0x0800, "m58819", 0 )  /* speech rom */
-	ROM_LOAD( "trs014ha.bin",      0x0000, 0x0800, CRC(d1f1b48c) SHA1(ee5584368d2e9f7bde271f5004585b53f5ff5c3f) ) /* speech rom */
+	ROM_LOAD( "trs-s__4h.4h",      0x0000, 0x0800, CRC(d1f1b48c) SHA1(ee5584368d2e9f7bde271f5004585b53f5ff5c3f) ) // 4H on the 'voice' board on top of the 5-pcb stack; eprom label is "TRS-S ['S' overstrikes a '1'] // 4H [stamped '8' or 'a' in red ink]"
 
 	ROM_REGION( 0x1000, "gfx1", 0 )
 	ROM_LOAD( "trs01v3f",     0x0000, 0x0800, CRC(f095330e) SHA1(dd3de744f28ff108630d3336bd246d3323fa34af) )