You should always mention the model number of the remote you are using, especially if it's a museum piece like the 15-1908.

The 15-1908 uses 3-digit setup codes, so the TV code would be TV/054 instead of TV/0054 (and the code is listed in the manual, so it should be present).

I'm not 100% sure of the key sequence needed to program EFCs to individual buttons, but I think this should work...

DEV [PROG] [9] [9] [9] KEY [PROG] d d d

For example, to program EFC 178 to the TV/VCR button, you would do this...

1) Tap the TV device button.
2) Tap the PROG button
3) Type 999
4) Tap the TV/VCR button
5) Tap the PROG button
6) Type 178


In case you need it, here's the online manual for the 15-1908...
[Link: support.radioshack.com]

Here's a link to a picture for anyone interested...