Raw TM data is in BSQ generic binary format.

The ltm_ii3p data contains 3 generic binary images. Each image represents one
band of the original 7 bands (only include 3 bands (red, green, blue?)).

Each image has 5729 rows with the first row being the header (5728 rows
in the image), and 6920 cols with each cell = 1 byte.

Included in each record is 32 prefix bytes and 68 suffix bytes.
Total size of each record = 7020 byes. 

I imported the generic binary format into ERDAS Imagine.
Import->GenericBinary
(select file)

When the selection dialog box appears:
(for importing the first third of the image)
-Select BSQ, 8 bit (Unsigned), 
 7020 file header bytes 
 7020 under size of record, 
 32 under line header bytes
 5728 under number of rows, and 6920 under number of columns.
 1 under number of bands

-Click o.k.

The data can then be viewed in the ERDAS Imagine viewer:
View->Raster->(select file)

To export to jpeg format I used xv software and did a GRAB->SAVE and selected
jpeg.