diff --git a/src/mame/drivers/cave.c b/src/mame/drivers/cave.c
index 0dd91c0b143..85a313e538c 100644
--- a/src/mame/drivers/cave.c
+++ b/src/mame/drivers/cave.c
@@ -3166,24 +3166,24 @@ ROM_START( esprade )
 	ROM_LOAD16_BYTE( "u41.int", 0x000001, 0x080000, CRC(97c1b649) SHA1(37a56b7b9662219a356aee3f4b5cbb774ac4950e) )
 
 	ROM_REGION( 0x1000000, "sprites", 0 )		/* Sprites */
-	ROM_LOAD16_BYTE( "u63.bin", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
-	ROM_LOAD16_BYTE( "u64.bin", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
-	ROM_LOAD16_BYTE( "u65.bin", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
-	ROM_LOAD16_BYTE( "u66.bin", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
+	ROM_LOAD16_BYTE( "esp_u63.u63", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
+	ROM_LOAD16_BYTE( "esp_u64.u64", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
+	ROM_LOAD16_BYTE( "esp_u65.u65", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
+	ROM_LOAD16_BYTE( "esp_u66.u66", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
 
 	ROM_REGION( 0x800000, "layer0", 0 )	/* Layer 0 */
-	ROM_LOAD( "u54.bin", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
-	ROM_LOAD( "u55.bin", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
+	ROM_LOAD( "esp_u54.u54", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
+	ROM_LOAD( "esp_u55.u55", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
 
 	ROM_REGION( 0x800000, "layer1", 0 )	/* Layer 1 */
-	ROM_LOAD( "u52.bin", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
-	ROM_LOAD( "u53.bin", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
+	ROM_LOAD( "esp_u52.u52", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
+	ROM_LOAD( "esp_u53.u53", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
 
 	ROM_REGION( 0x400000, "layer2", 0 )	/* Layer 2 */
-	ROM_LOAD( "u51.bin", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
+	ROM_LOAD( "esp_u51.u51", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
 
 	ROM_REGION( 0x400000, "ymz", 0 )	/* Samples */
-	ROM_LOAD( "u19.bin", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
+	ROM_LOAD( "esp_u19.u19", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
 
 	ROM_REGION16_BE( 0x80, "eeprom", 0 )
 	ROM_LOAD16_WORD( "eeprom-esprade.bin", 0x0000, 0x0080, CRC(315fb546) SHA1(7f597107d1610fc286413e0e93c794c80c0c554f) )
@@ -3195,24 +3195,24 @@ ROM_START( espradej )
 	ROM_LOAD16_BYTE( "u41_ver.2", 0x000001, 0x080000, CRC(734b3ef0) SHA1(f584227b85c347d62d5f179445011ce0f607bcfd) )
 
 	ROM_REGION( 0x1000000, "sprites", 0 )		/* Sprites */
-	ROM_LOAD16_BYTE( "u63.bin", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
-	ROM_LOAD16_BYTE( "u64.bin", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
-	ROM_LOAD16_BYTE( "u65.bin", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
-	ROM_LOAD16_BYTE( "u66.bin", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
+	ROM_LOAD16_BYTE( "esp_u63.u63", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
+	ROM_LOAD16_BYTE( "esp_u64.u64", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
+	ROM_LOAD16_BYTE( "esp_u65.u65", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
+	ROM_LOAD16_BYTE( "esp_u66.u66", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
 
 	ROM_REGION( 0x800000, "layer0", 0 )	/* Layer 0 */
-	ROM_LOAD( "u54.bin", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
-	ROM_LOAD( "u55.bin", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
+	ROM_LOAD( "esp_u54.u54", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
+	ROM_LOAD( "esp_u55.u55", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
 
 	ROM_REGION( 0x800000, "layer1", 0 )	/* Layer 1 */
-	ROM_LOAD( "u52.bin", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
-	ROM_LOAD( "u53.bin", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
+	ROM_LOAD( "esp_u52.u52", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
+	ROM_LOAD( "esp_u53.u53", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
 
 	ROM_REGION( 0x400000, "layer2", 0 )	/* Layer 2 */
-	ROM_LOAD( "u51.bin", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
+	ROM_LOAD( "esp_u51.u51", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
 
 	ROM_REGION( 0x400000, "ymz", 0 )	/* Samples */
-	ROM_LOAD( "u19.bin", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
+	ROM_LOAD( "esp_u19.u19", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
 
 	ROM_REGION16_BE( 0x80, "eeprom", 0 )
 	ROM_LOAD16_WORD( "eeprom-esprade.bin", 0x0000, 0x0080, CRC(315fb546) SHA1(7f597107d1610fc286413e0e93c794c80c0c554f) )
@@ -3224,24 +3224,24 @@ ROM_START( espradejo )
 	ROM_LOAD16_BYTE( "u41.bin", 0x000001, 0x080000, CRC(def30539) SHA1(957ad0b06f06689ae71393572592f6b8f818603a) )
 
 	ROM_REGION( 0x1000000, "sprites", 0 )		/* Sprites */
-	ROM_LOAD16_BYTE( "u63.bin", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
-	ROM_LOAD16_BYTE( "u64.bin", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
-	ROM_LOAD16_BYTE( "u65.bin", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
-	ROM_LOAD16_BYTE( "u66.bin", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
+	ROM_LOAD16_BYTE( "esp_u63.u63", 0x000000, 0x400000, CRC(2f2fe92c) SHA1(9519e365248bcec8419786eabb16fe4aae299af5) )
+	ROM_LOAD16_BYTE( "esp_u64.u64", 0x000001, 0x400000, CRC(491a3da4) SHA1(53549a2bd3edc7b5e73fb46e1421b156bb0c190f) )
+	ROM_LOAD16_BYTE( "esp_u65.u65", 0x800000, 0x400000, CRC(06563efe) SHA1(94e72da1f542b4e0525b4b43994242816b43dbdc) )
+	ROM_LOAD16_BYTE( "esp_u66.u66", 0x800001, 0x400000, CRC(7bbe4cfc) SHA1(e77d0ed7a11b5abca1df8a0eb20ac9360cf79e76) )
 
 	ROM_REGION( 0x800000, "layer0", 0 )	/* Layer 0 */
-	ROM_LOAD( "u54.bin", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
-	ROM_LOAD( "u55.bin", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
+	ROM_LOAD( "esp_u54.u54", 0x000000, 0x400000, CRC(e7ca6936) SHA1(b7f5ab67071a1d9dd3d2c1cd2304d9cdad68850c) )
+	ROM_LOAD( "esp_u55.u55", 0x400000, 0x400000, CRC(f53bd94f) SHA1(d0a74fb3d36fe522ef075e5ae44a9980da8abe2f) )
 
 	ROM_REGION( 0x800000, "layer1", 0 )	/* Layer 1 */
-	ROM_LOAD( "u52.bin", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
-	ROM_LOAD( "u53.bin", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
+	ROM_LOAD( "esp_u52.u52", 0x000000, 0x400000, CRC(e7abe7b4) SHA1(e98da45497e1aaf0d6ab352ec3e43c7438ed792a) )
+	ROM_LOAD( "esp_u53.u53", 0x400000, 0x400000, CRC(51a0f391) SHA1(8b7355cbad119f4e1add14e5cd5e343ec6706104) )
 
 	ROM_REGION( 0x400000, "layer2", 0 )	/* Layer 2 */
-	ROM_LOAD( "u51.bin", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
+	ROM_LOAD( "esp_u51.u51", 0x000000, 0x400000, CRC(0b9b875c) SHA1(ef05447cd8565ae24bb71db42342724622ad1e3e) )
 
 	ROM_REGION( 0x400000, "ymz", 0 )	/* Samples */
-	ROM_LOAD( "u19.bin", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
+	ROM_LOAD( "esp_u19.u19", 0x000000, 0x400000, CRC(f54b1cab) SHA1(34d70bb5798de85d892c062001d9ac1d6604fd9f) )
 
 	ROM_REGION16_BE( 0x80, "eeprom", 0 )
 	ROM_LOAD16_WORD( "eeprom-esprade.bin", 0x0000, 0x0080, CRC(315fb546) SHA1(7f597107d1610fc286413e0e93c794c80c0c554f) )