Ian,
These are the discrete codes that I ahve collected for a Panasonic Plasma:
Device=128.0
001 Input-AV/Video/S-video
005 Input-Next
006 Picture
007 Sound
012 Normalize
015 Off Timer
032 Volume-Up
033 Volume-Down
049 Surround
050 Mute
057 Status
061 Power-Toggle
062 Power-On
063 Power-Off
073 Action
074 Up
075 Down
078 Left
079 Right
082 Setup
122 Input-PC
212 Return
255 Factory Reset
Device=128.4
124 Input-Component/RGB
199 Aspect-Normal
201 Aspect-Zoom
203 Aspect-Just
204 Aspect-Auto
209 Aspect-Full
222 Aspect-Next
229 Picture Pos/Size
Device=128.32
005 TV/AV
006 Picture
007 Sound
016 1
017 2
018 3
019 4
020 5
021 6
022 7
023 8
024 9
025 0
032 +
033 -
052 Up Arrow
053 Down Arrow
057 õ
058 c
059 ²
061 Power Toggle
082 Setup
112 Red
113 Green
114 Yellow
115 Blue
Device=128.33
003 TV/Text
005 F.P.
008 Index
009 Hold
Device=128.36
222 Aspect
You can use John Fine's MakeHex for a Pronto note there are several different device codes. It looks like the main Tuner functions are 128.32. The aspect commands may well repeat from 128.4 to 128.36 where the former control the display and the latter the Tuner.
You may want to read the readme with this ccf file discussing the behavior of the input commands on the display:
[Link: remotecentral.com] and it has most of the commands for the display.
-Jon