diff --git a/src/devices/bus/saitek_osa/expansion.cpp b/src/devices/bus/saitek_osa/expansion.cpp
index ec5f527c919..b984d4b937c 100644
--- a/src/devices/bus/saitek_osa/expansion.cpp
+++ b/src/devices/bus/saitek_osa/expansion.cpp
@@ -4,8 +4,7 @@
 
 Saitek OSA Expansion Slot
 
-TODO:
-- not sure what RTS does
+Used by Saitek(SciSys) chess computers Leonardo, Galileo, Renaissance.
 
 ***************************************************************************/
 
diff --git a/src/devices/bus/saitek_osa/maestroa.cpp b/src/devices/bus/saitek_osa/maestroa.cpp
index 0eef1426dd3..78c16d6d791 100644
--- a/src/devices/bus/saitek_osa/maestroa.cpp
+++ b/src/devices/bus/saitek_osa/maestroa.cpp
@@ -15,6 +15,7 @@ Hardware notes:
 - 3 more sockets, one for KSO expansion ROM, 2 unused
 
 The PCB is not compatible for upgrading to newer Maestro versions.
+CPU is a 4MHz part. The higher speed Maestro versions overclock it.
 
 TODO:
 - does not work if cpu speed is 4MHz
diff --git a/src/mame/drivers/hh_hmcs40.cpp b/src/mame/drivers/hh_hmcs40.cpp
index 432e5fe53b6..c84a9019f16 100644
--- a/src/mame/drivers/hh_hmcs40.cpp
+++ b/src/mame/drivers/hh_hmcs40.cpp
@@ -56,6 +56,7 @@ known chips:
  @A45     HD38820  1982, Coleco Donkey Kong
  @A49     HD38820  1983, Bandai Zackman
  @A61     HD38820  1983, Coleco Ms. Pac-Man
+ *A62     HD38820  1983, Coleco Zaxxon
  @A63     HD38820  1983, Bandai Pengo
  @A65     HD38820  1983, Bandai Burger Time (PT-389)
  @A69     HD38820  1983, Gakken Dig Dug
diff --git a/src/mame/drivers/hh_tms1k.cpp b/src/mame/drivers/hh_tms1k.cpp
index 0a8c2f8926d..477b2149016 100644
--- a/src/mame/drivers/hh_tms1k.cpp
+++ b/src/mame/drivers/hh_tms1k.cpp
@@ -129,7 +129,8 @@ on Joerg Woerner's datamath.org: http://www.datamath.org/IC_List.htm
  @MP7551   TMS1670   1980, Entex Color Football 4 (6009)
  @MPF553   TMS1670   1980, Gakken/Entex Jackpot: Gin Rummy & Black Jack (6008) (note: assume F to be a misprint)
   MP7573   TMS1670   1981, Entex Select-A-Game cartridge: Football 4 -> sag.cpp
- *M95041   ?         1983, Tsukuda Game Pachinko (? note: 40-pin, VFD-capable)
+ *M30026   TMS2370   1983, Yaesu FT-757 Display Unit part  
+ *M95041   TMS2670   1983, Tsukuda Game Pachinko
 
   inconsistent: