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I presume this is one of the mid 80s Zeniths with the LED channel display and the random access keypad on the set?
Older TV remotes frequently took 9V batteries. Look inside the battery door or on it.
The buttons on the set itself numbered "1-0" (presumably similar to a phone or calculator keypad?) are for random channel access for remoteless sets. "Ent" is short for enter, to confirm that's the channel you want.
The bottons on the set that say "b'cast" and "catv" are buttons to switch the UHF tuner between broadcast and cable operation. "hrc" and "icc" are two other cable TV modes. "skip" tells the tuner circutry to skip a channel when tuning past it using channel up or down.
"AFC fixed search" should be an automatic channel scan--the type many modern sets do on initial power up after a loss of standby power. Try pressing it and see what happens, hey, the TV may setup its own channel database!
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