diff --git a/Ample/Resources/bbca.plist b/Ample/Resources/bbca.plist
index 8dad472..de30292 100644
--- a/Ample/Resources/bbca.plist
+++ b/Ample/Resources/bbca.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model A</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>4</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcb.plist b/Ample/Resources/bbcb.plist
index 74852de..db9f8c4 100644
--- a/Ample/Resources/bbcb.plist
+++ b/Ample/Resources/bbcb.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>4</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcb_de.plist b/Ample/Resources/bbcb_de.plist
index a96d245..72d8de1 100644
--- a/Ample/Resources/bbcb_de.plist
+++ b/Ample/Resources/bbcb_de.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B (German)</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>4</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcb_no.plist b/Ample/Resources/bbcb_no.plist
index 330fbd3..38e5267 100644
--- a/Ample/Resources/bbcb_no.plist
+++ b/Ample/Resources/bbcb_no.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B (Norway)</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>4</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcb_us.plist b/Ample/Resources/bbcb_us.plist
index cee9b10..c9cdd79 100644
--- a/Ample/Resources/bbcb_us.plist
+++ b/Ample/Resources/bbcb_us.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B (US)</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>4</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcbp.plist b/Ample/Resources/bbcbp.plist
index d91eefe..5de033f 100644
--- a/Ample/Resources/bbcbp.plist
+++ b/Ample/Resources/bbcbp.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B+ 64K</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>5</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcbp128.plist b/Ample/Resources/bbcbp128.plist
index 197d592..3e6c2d9 100644
--- a/Ample/Resources/bbcbp128.plist
+++ b/Ample/Resources/bbcbp128.plist
@@ -8,6 +8,10 @@
     <string>BBC Micro Model B+ 128K</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>7</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcm.plist b/Ample/Resources/bbcm.plist
index d880627..a789cb6 100644
--- a/Ample/Resources/bbcm.plist
+++ b/Ample/Resources/bbcm.plist
@@ -8,6 +8,10 @@
     <string>BBC Master 128</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>3</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcmc.plist b/Ample/Resources/bbcmc.plist
index 42a50ef..99b4293 100644
--- a/Ample/Resources/bbcmc.plist
+++ b/Ample/Resources/bbcmc.plist
@@ -8,6 +8,8 @@
     <string>BBC Master Compact</string>
     <key>media</key>
     <dict>
+      <key>rom</key>
+      <integer>6</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/bbcmt.plist b/Ample/Resources/bbcmt.plist
index d2c8456..763ed9c 100644
--- a/Ample/Resources/bbcmt.plist
+++ b/Ample/Resources/bbcmt.plist
@@ -8,6 +8,10 @@
     <string>BBC Master Turbo</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
+      <key>rom</key>
+      <integer>3</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/Ample/Resources/electron.plist b/Ample/Resources/electron.plist
index 56591d0..374a6d5 100644
--- a/Ample/Resources/electron.plist
+++ b/Ample/Resources/electron.plist
@@ -8,6 +8,8 @@
     <string>Acorn Electron</string>
     <key>media</key>
     <dict>
+      <key>cass</key>
+      <integer>1</integer>
     </dict>
     <key>resolution</key>
     <array>
diff --git a/python/mkmachines.py b/python/mkmachines.py
index 57f4bc5..31124a7 100644
--- a/python/mkmachines.py
+++ b/python/mkmachines.py
@@ -152,6 +152,10 @@ def find_machine_media(parent):
 		# mac
 		"scsi_hdd": "hard",
 		"cdrom": "cdrom",
+
+		# bbc
+		"bbc_rom": "rom", # bbc rom slot 0-3
+		"bbc_cass": "cass",
 	}
 	media = {}
 	for x in parent.findall("./device"):
@@ -168,7 +172,7 @@ def find_machine_media(parent):
 			if slot in ("rx01", ):
 				slot = None # pdp-11
 
-		#print(tag, " - ", slot, "  - ",intf)
+		# print(tag, " - ", slot, "  - ",intf)
 
 		# skip slot devices -- they'll be handled as part of the device.
 		if slot: continue