diff --git a/hash/ibm5150.xml b/hash/ibm5150.xml
index 25c0d346344..e703000d55a 100644
--- a/hash/ibm5150.xml
+++ b/hash/ibm5150.xml
@@ -7701,13 +7701,8 @@ has been replaced with an all-zero block. -->
 		<publisher>Tasc</publisher>
 		<info name="usage" value="ChessMachine installation required, see README.TXT" />
 		<part name="flop1" interface="floppy_3_5">
-			<dataarea name="flop" size="737280">
-				<rom name="disk1.img" size="737280" crc="989b0640" sha1="bf012e74a67590a94b3320727f76c834fabe4251"/>
-			</dataarea>
-		</part>
-		<part name="flop2" interface="floppy_3_5">
-			<dataarea name="flop" size="737280">
-				<rom name="disk2.img" size="737280" crc="4cf95170" sha1="320710397eaf659a631bc2fdd194805a3454665d"/>
+			<dataarea name="flop" size="1474560">
+				<rom name="chessmen.img" size="1474560" crc="737be161" sha1="edc6e6506778115b5238c6e8ad907ece42d99634"/>
 			</dataarea>
 		</part>
 	</software>
diff --git a/src/devices/machine/chessmachine.cpp b/src/devices/machine/chessmachine.cpp
index 981904e1d84..d5f6673fbad 100644
--- a/src/devices/machine/chessmachine.cpp
+++ b/src/devices/machine/chessmachine.cpp
@@ -25,6 +25,7 @@ CPU speed. It should be around 14-16MHz. The ARM CPU is rated 12MHz, they
 probably went for this solution to get optimum possible speed for each module.
 
 TODO:
+- PC version still gives a sync error on boot sometimes, probably related to quantum
 - is interrupt handling correct?
 - timer shouldn't be needed for disabling bootstrap, real ARM has already read the next opcode
 
diff --git a/src/mame/drivers/polgar.cpp b/src/mame/drivers/polgar.cpp
index db60525646c..7a6534bebc0 100644
--- a/src/mame/drivers/polgar.cpp
+++ b/src/mame/drivers/polgar.cpp
@@ -4,6 +4,8 @@
 
 Mephisto Polgar and RISC
 
+The chess engine in Mephisto Risc is also compatible with Tasc's The ChessMachine.
+
 TODO:
 - Mephisto Risc maincpu is more likely 5MHz, but LCD doesn't like it
 
diff --git a/src/mame/drivers/risc2500.cpp b/src/mame/drivers/risc2500.cpp
index 86eea5d52a4..7ff8fc55289 100644
--- a/src/mame/drivers/risc2500.cpp
+++ b/src/mame/drivers/risc2500.cpp
@@ -2,7 +2,9 @@
 // copyright-holders:Sandro Ronco
 /******************************************************************************
 
-    Saitek RISC 2500
+    Saitek RISC 2500, Mephisto Montreux
+
+    The chess engine is also compatible with Tasc's The ChessMachine software.
 
     TODO:
      - Sound is too short and high pitch, better when you underclock the cpu.
diff --git a/src/mame/drivers/tasc.cpp b/src/mame/drivers/tasc.cpp
index 2665c2d2c72..671c521eedc 100644
--- a/src/mame/drivers/tasc.cpp
+++ b/src/mame/drivers/tasc.cpp
@@ -4,6 +4,9 @@
 
 Tasc ChessSystem
 
+Commonly known as Tasc R30, it's basically a dedicated ChessMachine.
+The chess engine is also compatible with Tasc's The ChessMachine software.
+
 R30 hardware notes:
 - ARM6 CPU(P60ARM/CG) @ 30MHz
 - 256KB ROM, 512KB program RAM, 128KB permanent RAM