diff --git a/src/mame/drivers/circus.c b/src/mame/drivers/circus.c
index bc0a6af15b7..15e1f4e4ceb 100644
--- a/src/mame/drivers/circus.c
+++ b/src/mame/drivers/circus.c
@@ -1,5 +1,17 @@
 /***************************************************************************
 
+'Universal' Game Board V1
+
+name                 year  CPU    board/rom numbers
+
+Robot Bowl           1977  6502   4020-4027, 4010-4013
+Circus               1977  6502   9000-9003, 9004-9011
+Rip Cord         May,1979  6502   RC30-0014 (cpu) 0015 (snd)
+                                  9023-9026, 9027-9034, 9035
+Crash           July,1979  6502   CR30-3162 (cpu) 3161 (snd)  9036 (?)
+
+***************************************************************************
+
 Circus memory map
 
 driver by Mike Coates
diff --git a/src/mame/drivers/exidy.c b/src/mame/drivers/exidy.c
index ccee8863ad0..0cf92d4d6cd 100644
--- a/src/mame/drivers/exidy.c
+++ b/src/mame/drivers/exidy.c
@@ -16,6 +16,22 @@
     Known bugs:
         * none at this time
 
+
+'Universal' Game Board V2 (xxL logic, xxA audio)
+
+Name                 Year  CPU    board/rom numbers
+
+Side Track           1979  6502   STL, STA
+Targ                 1980  6502   HRL, HRA
+Spectar              1980  6502   SPL, SPA
+Mouse Trap           1981  6502   MTL, MTA
+Venture              1981  6502   VEL, VEA
+Teeter Torture       1982  6502   Prototype
+Pepper II            1982  6502   77-0008,77-0007 PTL, PTA
+Hard Hat             1982  6502   HHL, HHA
+Fax                  1982  6502   FXL, FLA
+
+
 ****************************************************************************
 
     Exidy memory map
diff --git a/src/mame/drivers/exidy440.c b/src/mame/drivers/exidy440.c
index 1811eb47031..6dab2f3c899 100644
--- a/src/mame/drivers/exidy440.c
+++ b/src/mame/drivers/exidy440.c
@@ -17,6 +17,23 @@
         * Showdown
         * Yukon
 
+
+440 System
+
+Name                 Year  CPU    board/rom numbers
+
+Crossbow             1983  6809   77-0019, 77-0022
+Cheyenne             1984  6809
+Combat               1985  6809
+Chiller              1986  6809
+Clay Pigeon          1986  6809
+Crackshot            1986  6809
+Hit 'n Miss          1986  6809
+Top Secret           1986  6809
+Showdown             1988  6809
+Who Dunnit           1988  6809
+
+
 ****************************************************************************
 
     Memory map
diff --git a/src/mame/drivers/m58.c b/src/mame/drivers/m58.c
index 51a67f8ada8..6aa7c6044a1 100644
--- a/src/mame/drivers/m58.c
+++ b/src/mame/drivers/m58.c
@@ -220,6 +220,7 @@ MACHINE_CONFIG_END
  *************************************/
 
 ROM_START( 10yard )
+// Dumped from an original Irem M52 board. Serial no. 307761/License Seal 09461.
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "yf-a-3p-b",    0x0000, 0x2000, CRC(2e205ec2) SHA1(fcfa08f45423b35f2c99d4e6b5474ab1b3a84fec) )
 	ROM_LOAD( "yf-a-3n-b",    0x2000, 0x2000, CRC(82fcd980) SHA1(7846705b29961cb95ee1571ee7e16baceea522d4) )
diff --git a/src/mame/drivers/taito_b.c b/src/mame/drivers/taito_b.c
index ecc91bfdbe8..b512c3ea250 100644
--- a/src/mame/drivers/taito_b.c
+++ b/src/mame/drivers/taito_b.c
@@ -3738,6 +3738,7 @@ ROM_START( silentdj )
 ROM_END
 
 ROM_START( silentdu )
+// Dumped from an original Taito PCB (ET910000B)
 	ROM_REGION( 0x80000, "maincpu", 0 )     /* 256k for 68000 code */
 	ROM_LOAD16_BYTE( "east-12-1.ic32", 0x00000, 0x20000, CRC(5883d362) SHA1(21c3af053fa92c26f119466ecd655697cc72ff3a) )
 	ROM_LOAD16_BYTE( "east-14-1.ic10", 0x00001, 0x20000, CRC(3267bcd5) SHA1(358a717d0cdd22d84eb0d928c36e4e72a40c2882) )
@@ -3866,4 +3867,4 @@ GAME( 1994, spacedxo, spacedx, spacedxo, spacedxo, taito_b, ROT0,   "Taito Corpo
     in that it has a punching pad that player needs to punch to hit
     the enemy.
 */
-GAME(  1990, sbm,      0,       sbm,      sbm,      taito_b, ROT0,   "Taito Corporation", "Sonic Blast Man (Japan)", GAME_SUPPORTS_SAVE )
+GAME(  1990, sbm,      0,       sbm,      sbm,      taito_b, ROT0,   "Taito Corporation", "Sonic Blast Man (Japan)", GAME_SUPPORTS_SAVE | GAME_MECHANICAL )