From: https://news.google.com/newspapers?nid=ggypx7smY2AC&dat=19900105&printsec=frontpage&hl=en (page 5)
2 - Cable News Network
3 - Lifetime
4 - WFLD (FOX 32 Chicago) [South Bend didn't have a FOX affiliate at this time]
5 - Music Television
6 - WSJV (ABC 28 Elkhart)
7 - USA Network
8 - WNDU (NBC 16 South Bend)
9 - WGN (IND 9 Chicago)
10 - WNIT (PBS 34 South Bend)
11 - WHME (IND 46 South Bend)
12 - WSBT (CBS 22 South Bend)
13 - ESPN
14 - Financial News Network / SportsChannel Chicago
15 - WTTW (PBS 11 Chicago)
16 - A&E Network
17 - WTBS (IND 17 Atlanta)
18 - C-SPAN / WKJG (NBC 33 Fort Wayne) [WNDU must have been known for pre-empting NBC programming at this time]
19 - Cable Value Network
20 - The Nashville Network
21 - WFFT (FOX 55 Fort Wayne) [see note for WFLD]
22 - Nickelodeon
23 - CBN Family Channel
24 - Turner Network Television
25 - Weather Channel
26 - Discovery Channel
27 - Disney Channel
28 - Showtime
29 - Home Box Office
30 - Cinemax
31 - WTTV (IND 4 Bloomington)
32 - American Movie Classics / VISN
33 - Country Music Television
2 - Cable News Network
3 - Lifetime
4 - WFLD (FOX 32 Chicago) [South Bend didn't have a FOX affiliate at this time]
5 - Music Television
6 - WSJV (ABC 28 Elkhart)
7 - USA Network
8 - WNDU (NBC 16 South Bend)
9 - WGN (IND 9 Chicago)
10 - WNIT (PBS 34 South Bend)
11 - WHME (IND 46 South Bend)
12 - WSBT (CBS 22 South Bend)
13 - ESPN
14 - Financial News Network / SportsChannel Chicago
15 - WTTW (PBS 11 Chicago)
16 - A&E Network
17 - WTBS (IND 17 Atlanta)
18 - C-SPAN / WKJG (NBC 33 Fort Wayne) [WNDU must have been known for pre-empting NBC programming at this time]
19 - Cable Value Network
20 - The Nashville Network
21 - WFFT (FOX 55 Fort Wayne) [see note for WFLD]
22 - Nickelodeon
23 - CBN Family Channel
24 - Turner Network Television
25 - Weather Channel
26 - Discovery Channel
27 - Disney Channel
28 - Showtime
29 - Home Box Office
30 - Cinemax
31 - WTTV (IND 4 Bloomington)
32 - American Movie Classics / VISN
33 - Country Music Television