add gio64_gfx for SGI

python/machines.py

@@ -171,6 +171,9 @@ SLOTS = (
 
 	# lisa
 	"pp",
+
+	# sgi
+	"gio64_gfx",
 )
 
 SLOT_NAMES = {
@@ -289,6 +292,9 @@ SLOT_NAMES = {
 	# lisa
 	"pp":         "Parallel",
 
+	# sgi
+	"gio64_gfx":      "GIO64 Graphics",
+
 }