diff --git a/src/mess/drivers/a7000.c b/src/mess/drivers/a7000.c
index fc0da6c93ff..4db85ad1fe9 100644
--- a/src/mess/drivers/a7000.c
+++ b/src/mess/drivers/a7000.c
@@ -808,19 +808,28 @@ MACHINE_CONFIG_END
 
 ROM_START(a7000)
 	ROM_REGION( 0x800000, "user1", ROMREGION_ERASEFF )
-	ROM_LOAD( "rom1.bin", 0x000000, 0x100000, CRC(ff0e3d12) SHA1(fa489bebede3d13dc43cddec5b5c9b6829a28914) )
-	ROM_LOAD( "rom2.bin", 0x100000, 0x100000, CRC(4ae4fd8b) SHA1(1b30d5905d5364dfa48bad69257b0ef8190e9bf6) )
-	ROM_LOAD( "rom3.bin", 0x200000, 0x100000, CRC(3108fb2b) SHA1(865b01583f3fb5f4ed5e9201676db327cdeb40b3) )
-	ROM_LOAD( "rom4.bin", 0x300000, 0x100000, CRC(55a51980) SHA1(a7191727edd5babf679ebbdea6585833a1fb34e6) )
-
+	// Version 3.60
+	ROM_SYSTEM_BIOS( 0, "360", "RiscOS 3.60" )
+	ROMX_LOAD( "1203,101-01.bin", 0x000000, 0x200000, CRC(2eeded56) SHA1(7217f942cdac55033b9a8eec4a89faa2dd63cd68), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(1))
+	ROMX_LOAD( "1203,102-01.bin", 0x000002, 0x200000, CRC(6db87d21) SHA1(428403ed31682041f1e3d114ea02a688d24b7d94), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(1))
 	ROM_REGION( 0x800000, "vram", ROMREGION_ERASE00 )
 ROM_END
 
 ROM_START(a7000p)
 	ROM_REGION( 0x800000, "user1", ROMREGION_ERASEFF )
-	ROM_LOAD( "riscos-3.71.rom", 0x000000, 0x400000, CRC(211cf888) SHA1(c5fe0645e48894fb4b245abeefdc9a65d659af59))
-
-	ROM_REGION( 0x800000, "vram", ROMREGION_ERASE00 )
+	// Version 3.71
+	ROM_SYSTEM_BIOS( 0, "371", "RiscOS 3.71" )
+	ROMX_LOAD( "1203,261-01.bin", 0x000000, 0x200000, CRC(8e3c570a) SHA1(ffccb52fa8e165d3f64545caae1c349c604386e9), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(1))
+	ROMX_LOAD( "1203,262-01.bin", 0x000002, 0x200000, CRC(cf4615b4) SHA1(c340f29aeda3557ebd34419fcb28559fc9b620f8), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(1))
+	// Version 4.02
+	ROM_SYSTEM_BIOS( 1, "402", "RiscOS 4.02" )
+	ROMX_LOAD( "riscos402_1.bin", 0x000000, 0x200000, CRC(4c32f7e2) SHA1(d290e29a4de7be9eb36cbafbb2dc99b1c4ce7f72), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(2))
+	ROMX_LOAD( "riscos402_2.bin", 0x000002, 0x200000, CRC(7292b790) SHA1(67f999c1ccf5419e0a142b7e07f809e13dfed425), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(2))
+	// Version 4.39
+	ROM_SYSTEM_BIOS( 2, "439", "RiscOS 4.39" )
+	ROMX_LOAD( "riscos439_1.bin", 0x000000, 0x200000, CRC(dab94cb8) SHA1(a81fb7f1a8117f85e82764675445092d769aa9af), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(3))
+	ROMX_LOAD( "riscos439_2.bin", 0x000002, 0x200000, CRC(22e6a5d4) SHA1(b73b73c87824045130840a19ce16fa12e388c039), ROM_GROUPWORD | ROM_SKIP(2) | ROM_BIOS(3))
+  	ROM_REGION( 0x800000, "vram", ROMREGION_ERASE00 )
 ROM_END
 
 /***************************************************************************
diff --git a/src/mess/drivers/dragon.c b/src/mess/drivers/dragon.c
index 6a0f0909693..f3b1b374981 100644
--- a/src/mess/drivers/dragon.c
+++ b/src/mess/drivers/dragon.c
@@ -241,6 +241,12 @@ ROM_START(dragon64)
 	ROM_LOAD("d64_2.rom",    0x8000,  0x4000, CRC(17893a42) SHA1(e3c8986bb1d44269c4587b04f1ca27a70b0aaa2e))
 ROM_END
 
+ROM_START(dragon200)
+    ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
+	ROM_LOAD( "ic18.rom", 	 0x0000, 0x4000, CRC(84f68bf9) SHA1(1983b4fb398e3dd9668d424c666c5a0b3f1e2b69))
+	ROM_LOAD( "ic17.rom",	 0x8000, 0x4000, CRC(17893a42) SHA1(e3c8986bb1d44269c4587b04f1ca27a70b0aaa2e))
+ROM_END
+
 ROM_START(d64plus)
 	ROM_REGION(0x10000,"maincpu",0)
 	ROM_LOAD("d64_1.rom",    0x0000,  0x4000, CRC(60a4634c) SHA1(f119506eaa3b4b70b9aa0dd83761e8cbe043d042))
@@ -262,6 +268,7 @@ ROM_END
 
 COMP(  1982,    dragon32,   coco,   0,      dragon32,  dragon32, driver_device,  0,      "Dragon Data Ltd",            "Dragon 32", 0)
 COMP(  1983,    dragon64,   coco,   0,      dragon64,  dragon32, driver_device,  0,      "Dragon Data Ltd",            "Dragon 64", 0)
+COMP(  1983,    dragon200,  coco,	0,      dragon64,  dragon32, driver_device,  0,      "Dragon Data Ltd",            "Dragon 200", 0)
 COMP(  1983,    d64plus,    coco,   0,      d64plus,   dragon32, driver_device,  0,      "Dragon Data Ltd",            "Dragon 64 Plus", 0)
 COMP(  1983,    tanodr64,   coco,   0,      tanodr64,  dragon32, driver_device,  0,      "Dragon Data Ltd / Tano Ltd", "Tano Dragon 64 (NTSC)", 0)
 COMP(  1984,    dgnalpha,   coco,   0,      dgnalpha,  dragon32, driver_device,  0,      "Dragon Data Ltd",            "Dragon Alpha Prototype", 0)
diff --git a/src/mess/mess.lst b/src/mess/mess.lst
index 483de6c072b..ba08c29242e 100644
--- a/src/mess/mess.lst
+++ b/src/mess/mess.lst
@@ -1089,6 +1089,7 @@ coco3p	// Color Computer 3 (PAL)
 coco3h	// Hacked Color Computer 3 (6309)
 dragon32  // Dragon 32
 dragon64  // Dragon 64
+dragon200 // Dragon 200
 d64plus   // Dragon 64 + Compusense Plus addon
 dgnalpha  // Dragon Alpha
 dgnbeta   // Dragon Beta