Try the following to convert your Mits remote to discrete mode:

Set the Slide Switch at the top of the Mitsubishi Remote to TV.
Press and hold the POWER button, and while holding the power button enter 090.

Now the remote functions like this:

Power = Power On Only
Stop = Power Off Only
Pause = AV Reset

Pressing DEVICE UP followed by:
PIP = DTV (HD Input)
1 = Input 1
2 = Input 2
3 = Input 3
4 = Input 4
5 = DVD / Component 1
6 = Component 2
SQV = Input STB or Input 5 (depending on model)
QV = Input VGA
PIP CH Up = Antenna A
PIP CH Down = Antenna B
SQV = Front SVideo
QV = VGA
PIP/POP = OTA HD Antenna (Built-In HD Tuner)

Learn the desired commands to your universal remote.
When done, press and hold POWER button and enter code 000 on your Mits remote to return to its normal functioning mode.

For older model Mits, use the "Input" key instead of "Device".

Mike
www.SurfRemoteControl.com