diff --git a/src/mame/drivers/cps2.cpp b/src/mame/drivers/cps2.cpp
index 837f07ef636..deb1874417f 100644
--- a/src/mame/drivers/cps2.cpp
+++ b/src/mame/drivers/cps2.cpp
@@ -644,7 +644,7 @@ Stephh's inputs notes (based on some tests on the "parent" set) :
 /* Maximum size of Q Sound Z80 region */
 #define QSOUND_SIZE 0x50000
 
-/* Maximum 680000 code size */
+/* Maximum 68000 code size */
 #undef  CODE_SIZE
 #define CODE_SIZE   0x0400000
 
diff --git a/src/mame/drivers/fidel_csc.cpp b/src/mame/drivers/fidel_csc.cpp
index e4f14344895..bca1e0b125d 100644
--- a/src/mame/drivers/fidel_csc.cpp
+++ b/src/mame/drivers/fidel_csc.cpp
@@ -518,8 +518,8 @@ void csc_state::csc_map(address_map &map)
 	map(0x1000, 0x1003).mirror(0x47fc).rw(m_pia[1], FUNC(pia6821_device::read), FUNC(pia6821_device::write));
 	map(0x1800, 0x1803).mirror(0x47fc).rw(m_pia[0], FUNC(pia6821_device::read), FUNC(pia6821_device::write));
 	map(0x2000, 0x3fff).mirror(0x4000).rom();
-	map(0xa000, 0xafff).rom().region("maincpu", 0xb000);
-	map(0xb000, 0xffff).rom();
+	map(0xa000, 0xafff).mirror(0x1000).rom();
+	map(0xc000, 0xffff).rom();
 }
 
 void csc_state::su9_map(address_map &map)
@@ -722,7 +722,8 @@ void csc_state::rsc(machine_config &config)
 ROM_START( csc )
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD("101-64019",   0x2000, 0x2000, CRC(08a3577c) SHA1(69fe379d21a9d4b57c84c3832d7b3e7431eec341) )
-	ROM_LOAD("101-1025a03", 0xa000, 0x2000, CRC(63982c07) SHA1(5ed4356323d5c80df216da55994abe94ba4aa94c) )
+	ROM_LOAD("101-1025a03", 0xa000, 0x1000, CRC(63982c07) SHA1(5ed4356323d5c80df216da55994abe94ba4aa94c) )
+	ROM_CONTINUE(           0xa000, 0x1000 ) // 1st half empty
 	ROM_LOAD("101-1025a02", 0xc000, 0x2000, CRC(9e6e7c69) SHA1(4f1ed9141b6596f4d2b1217d7a4ba48229f3f1b0) )
 	ROM_LOAD("101-1025a01", 0xe000, 0x2000, CRC(57f068c3) SHA1(7d2ac4b9a2fba19556782863bdd89e2d2d94e97b) )
 	ROM_LOAD("74s474",      0xfe00, 0x0200, CRC(4511ba31) SHA1(e275b1739f8c3aa445cccb6a2b597475f507e456) )
diff --git a/src/mame/drivers/namcond1.cpp b/src/mame/drivers/namcond1.cpp
index 14b074e992e..9cd307e7dbb 100644
--- a/src/mame/drivers/namcond1.cpp
+++ b/src/mame/drivers/namcond1.cpp
@@ -352,7 +352,7 @@ INTERRUPT_GEN_MEMBER(namcond1_state::mcu_interrupt)
 
 /******************************************
   ND-1 Master clock = 49.152MHz
-  - 680000  = 12288000 (CLK/4)
+  - 68000   = 12288000 (CLK/4)
   - H8/3002 = 16384000 (CLK/3)
   - The level 1 interrupt to the 68k has been measured at 60Hz.
 *******************************************/
diff --git a/src/mame/drivers/namcos2.cpp b/src/mame/drivers/namcos2.cpp
index dc1085cfa80..49624a2a93d 100644
--- a/src/mame/drivers/namcos2.cpp
+++ b/src/mame/drivers/namcos2.cpp
@@ -1623,7 +1623,7 @@ internal divider.
 
 Soooo;
 
-680000  = 12288000
+68000   = 12288000
 6809    =  3072000
 63B05Z0 =  2048000
 
diff --git a/src/mame/drivers/nmk16.cpp b/src/mame/drivers/nmk16.cpp
index 8028fdf6ebe..72dc1415a4d 100644
--- a/src/mame/drivers/nmk16.cpp
+++ b/src/mame/drivers/nmk16.cpp
@@ -6057,7 +6057,7 @@ UPL-90062
 |SBS-G_03.IC194                                                    10MHz  |
 |-------------------------------------------------------------------------|
 Notes:
-      680000 @ 10.0MHz
+      68000 @ 10.0MHz
       YM2203 @ 1.5MHz [12/8]
       M6295 @ 4.0MHz [12/3], pin 7 HIGH
       VSync 60Hz
diff --git a/src/mame/drivers/saitek_ssystem3.cpp b/src/mame/drivers/saitek_ssystem3.cpp
index ff9b39fcb26..6c163500044 100644
--- a/src/mame/drivers/saitek_ssystem3.cpp
+++ b/src/mame/drivers/saitek_ssystem3.cpp
@@ -12,7 +12,9 @@ This is their 1st original product. MK II was licensed from Commodore, and
 MK I was, to put it bluntly, a bootleg. The chess engine is by Mike Johnson,
 with support from David Levy.
 
-Hardware notes: (main unit)
+Hardware notes:
+
+Master Unit:
 - Synertek 6502A @ 2MHz (4MHz XTAL)
 - Synertek 6522 VIA
 - 8KB ROM (2*Synertek 2332)
@@ -25,7 +27,7 @@ Chess Unit:
 - PCB label: Radofin XM-2057-0C
 - Fairchild F6808P CPU @ ?MHz (M6808 compatible)
 - Fairchild F6821P PIA
-- C28A97M 4KB ROM(2332), 128x8 RAM(F6810P)
+- 2KB ROM(2332), 128x8 RAM(F6810P)
 - 2*HLCD0438, chessboard LCD
 
 Printer Unit: