diff --git a/hwdb.d/80-ieee1394-unit-function.hwdb b/hwdb.d/80-ieee1394-unit-function.hwdb
index cf55f5524c..d62a2dec4b 100644
--- a/hwdb.d/80-ieee1394-unit-function.hwdb
+++ b/hwdb.d/80-ieee1394-unit-function.hwdb
@@ -903,7 +903,7 @@ ieee1394:ven00001C6Amo00000002sp00001C6Aver00000001
 ieee1394:node:ven0x001c6amo0x000003units0x001c6a:0x000001
 ieee1394:ven00001C6Amo00000003sp00001C6Aver00000001
  ID_VENDOR_FROM_DATABASE=Weiss Engineering
- ID_MODEL_FROM_DATABASE=Minerva
+ ID_MODEL_FROM_DATABASE=DAC2/Minerva
  IEEE1394_UNIT_FUNCTION_AUDIO=1
 
 ieee1394:node:ven0x001c6amo0x000004units0x001c6a:0x000001
@@ -912,16 +912,14 @@ ieee1394:ven00001C6Amo00000004sp00001C6Aver00000001
  ID_MODEL_FROM_DATABASE=AFI1
  IEEE1394_UNIT_FUNCTION_AUDIO=1
 
-ieee1394:node:ven0x001c6amo0x000005units0x001c6a:0x000001
-ieee1394:ven00001C6Amo00000005sp00001C6Aver00000001
- ID_VENDOR_FROM_DATABASE=Weiss Engineering
- ID_MODEL_FROM_DATABASE=DAC1
- IEEE1394_UNIT_FUNCTION_AUDIO=1
-
+# Starting from the middle of life time of INT203, the same firmware as
+# INT202 is compatible. The firmware dynamically switches its functionality
+# based on the state of internal jumper pins. Additionally, the design of
+# FireWire option card for DAC1 is something like embedded-INT203.
 ieee1394:node:ven0x001c6amo0x000006units0x001c6a:0x000001
 ieee1394:ven00001C6Amo00000006sp00001C6Aver00000001
  ID_VENDOR_FROM_DATABASE=Weiss Engineering
- ID_MODEL_FROM_DATABASE=INT202
+ ID_MODEL_FROM_DATABASE=INT202/INT203/DAC1
  IEEE1394_UNIT_FUNCTION_AUDIO=1
 
 ieee1394:node:ven0x001c6amo0x000007units0x001c6a:0x000001
@@ -930,6 +928,20 @@ ieee1394:ven00001C6Amo00000007sp00001C6Aver00000001
  ID_MODEL_FROM_DATABASE=DAC202
  IEEE1394_UNIT_FUNCTION_AUDIO=1
 
+ieee1394:node:ven0x001c6amo0x000008units0x001c6a:0x000001
+ieee1394:ven00001C6Amo00000008sp00001C6Aver00000001
+ ID_VENDOR_FROM_DATABASE=Weiss Engineering
+ ID_MODEL_FROM_DATABASE=DAC202/Maya
+ IEEE1394_UNIT_FUNCTION_AUDIO=1
+
+# The older version of firmware for INT203. Additionally, the design of
+# FireWire option card for DAC1 is something like embedded-INT203.
+ieee1394:node:ven0x001c6amo0x00000aunits0x001c6a:0x000001
+ieee1394:ven00001C6Amo0000000Asp00001C6Aver00000001
+ ID_VENDOR_FROM_DATABASE=Weiss Engineering
+ ID_MODEL_FROM_DATABASE=INT203/DAC1
+ IEEE1394_UNIT_FUNCTION_AUDIO=1
+
 #
 # Digidesign Digi00x family.
 #
@@ -1387,3 +1399,19 @@ ieee1394:ven000001F2mo*sp000001F2ver00000024
  ID_VENDOR_FROM_DATABASE=MOTU
  ID_MODEL_FROM_DATABASE=MOTU V4HD
  IEEE1394_UNIT_FUNCTION_VIDEO=1
+
+# Weiss Engineering MAN301 (DICE application): unit 0: AV/C devices 1.0.
+ieee1394:node:ven0x001c6amo0x00000bunits*0x00a02d:0x010001*
+ieee1394:ven00001C6Amo0000000Bsp0000A02Dver00010001
+ ID_VENDOR_FROM_DATABASE=Weiss Engineering Ltd.
+ ID_MODEL_FROM_DATABASE=MAN301
+ IEEE1394_UNIT_FUNCTION_AUDIO=1
+ IEEE1394_UNIT_FUNCTION_VIDEO=0
+
+# Weiss Engineering MAN301 (DICE application): unit 1: TCAT general protocol.
+ieee1394:node:ven0x001c6amo0x00000bunits*0x001c6a:0x000001*
+ieee1394:ven00001C6Amo0000000Bsp00001C6Aver00000001
+ ID_VENDOR_FROM_DATABASE=Weiss Engineering Ltd.
+ ID_MODEL_FROM_DATABASE=MAN301
+ IEEE1394_UNIT_FUNCTION_AUDIO=1
+ IEEE1394_UNIT_FUNCTION_VIDEO=0