diff --git a/src/mame/drivers/calomega.cpp b/src/mame/drivers/calomega.cpp
index d34862c0366..ba4c0357fb2 100644
--- a/src/mame/drivers/calomega.cpp
+++ b/src/mame/drivers/calomega.cpp
@@ -338,7 +338,7 @@
     This game was created by Tuni Electro Service and was licensed to E.T. Marketing,Inc.
     This is the new version. The old one is still undumped, but looks like Golden Poker D-Up.
 
-    Flyer: http://www.arcadeflyers.com/?page=thumbs&db=videodb&id=4542
+    Flyer: https://flyers.arcade-museum.com/?page=flyer&db=videodb&id=4542&image=1
 
     The AY8912 is mapped to 0x840/0x841 but the game lacks of credits and bet sounds.
     The rest of sounds are ok. Maybe the missing ones are generated by discrete circuitry.
@@ -396,18 +396,20 @@
 
     --- System 906-III ---
 
-    $0000 - $07FF   NVRAM           ; All registers and settings.
-    $2C08 - $2C08   AY-8912         ; Read/Control.
-    $2C09 - $2C09   AY-8912         ; Write.
-    $280C - $280F   PIAT0           ; I/O unknown.
-    $2824 - $2827   PIAT1           ; I/O unknown.
+    $0000 - $1FFF   NVRAM           ; All registers and settings.
+    $280C - $280F   PIAT0           ; I/O functions.
+    $2810 - $2810   ACIA6850        ; ACIA read.
+    $2811 - $2811   ACIA6850        ; ACIA write.
+    $2824 - $2827   PIAT1           ; I/O functions.
     $2C04 - $2C04   CRTC6845        ; MC6845 addressing.
-    $2C05 - $2C05   CRTC6845        ; MC6845 Read/Write.
+    $2C05 - $2C05   CRTC6845        ; MC6845 read/write.
+    $2C08 - $2C08   AY-8912         ; Read/control.
+    $2C09 - $2C09   AY-8912         ; Write.
 
     $2000 - $23FF   VideoRAM
     $2400 - $27FF   ColorRAM
 
-    $6000 - $FFFF   ROM space.      ; System 906.
+    $6000 - $FFFF   ROM space.      ; System 906-III.
 
     No mirrors... Using the whole CPU addressing.
 
@@ -936,7 +938,6 @@ void calomega_state::sys905_map(address_map &map)
 
 void calomega_state::sys906_map(address_map &map)
 {
-	//map(0x0000, 0x07ff).ram().share("nvram");
 	map(0x0000, 0x1fff).ram().share("nvram"); 
 	map(0x280c, 0x280f).rw("pia0", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
 	map(0x2810, 0x2811).rw(m_acia6850_0, FUNC(acia6850_device::read), FUNC(acia6850_device::write));