Pi Firmware: revert to BBC configs as default

Change-Id: Ib8c0902c9c74711ea4c36af96167b8176e8aafcb

src/scripts/cmdline.txt

@@ -137,7 +137,7 @@
 # Important: All the properties must be on a single line, and no blank lines!
 #
 # Here's a good default for a Beeb or Master
-#sampling06=3 sampling7=0,2,2,2,2,2,2,0 info=1 palette=0 deinterlace=1 scanlines=0 mux=0 elk=0 vsync=0 pllh=0 nbuffers=2 debug=0 m7disable=0
+sampling06=3 sampling7=0,2,2,2,2,2,2,0 info=1 palette=0 deinterlace=1 scanlines=0 mux=0 elk=0 vsync=0 pllh=0 nbuffers=2 debug=0 m7disable=0
 #
 # Here's a example showing no oversampling in Mode 0..6
 # sampling06=0,4,4,4,4,4,4,2 geometry06=37,28,80,256,640,512 info=1 palette=0 deinterlace=1 scanlines=0 mux=0 elk=0 vsync=0 pllh=0 nbuffers=2 debug=1 m7disable=0
@@ -147,5 +147,10 @@
 #
 # Here's an example that might work with an Atom (CPLDv1) (narrow border)
 #sampling06=5 geometry06=3,37,66,200,528,400,85909091,5472,524,0 nbuffers=2 m7disable=1
+#
 # Here's an example that might work with an Atom (CPLDv1) (wider border)
-sampling06=5 geometry06=0,31,69,212,552,424,85909091,5472,524,0 nbuffers=2 m7disable=1
+#sampling06=5 geometry06=0,31,69,212,552,424,85909091,5472,524,0 nbuffers=2 m7disable=1
+#
+# Here's an example that might work wirg a ZX80/ZX81
+#
+#sampling06=4 geometry06=9,18,84,270,672,540,78000000,4968,620,0 nbuffers=2 m7disable=1

src/scripts/config.txt

@@ -83,12 +83,12 @@ disable_overscan=1
 ##   l/r overscan = (1920-1344)/2  = 288
 ##   t/b overscan = (1080-1080)/2  =   0
 ##
-#hdmi_group=1
-#hdmi_mode=31
-#overscan_left=288
-#overscan_right=288
-#overscan_top=0
-#overscan_bottom=0
+hdmi_group=1
+hdmi_mode=31
+overscan_left=288
+overscan_right=288
+overscan_top=0
+overscan_bottom=0
 
 ## Example using hdmi_timings
 ##
@@ -311,12 +311,12 @@ disable_overscan=1
 ##   l/r overscan = (1600-1380)/2 = 110
 ##   t/b overscan = (1200-1060)/2 = 70
 ##
-hdmi_group=2
-hdmi_mode=51
-overscan_left=110
-overscan_right=110
-overscan_top=70
-overscan_bottom=70
+#hdmi_group=2
+#hdmi_mode=51
+#overscan_left=110
+#overscan_right=110
+#overscan_top=70
+#overscan_bottom=70
 
 # Further notes....
 #