In 80-column mode, the status line has some extra informaiton:

:E:T:K:C:B:X:     2400     ANSI     Zmodem     3:30pm     00:00

The letters separated by colons represent the status of certain terminal
settings. A letter appears highlighted (reversed) if its setting is "on"
and normal if its setting is "off". The function of each letter is
described in more detail in the referenced sections:

E: Local echo. This determines whether keys you type are displayed
on your screen as well as sent to the modem. (see 3.1.3, Commodore
key commands, C= E)

T: ASCII translation. This indicates whether ASCII translation is in
effect. (see 3.1.3, Commodore key commands, C= A)

K: Control character display. If this is on, control characters are
printed explicitly. For instance, a CTRL-A would be displayed with
the characters ^A. (see 3.1.3 Commodore key commands, C= K)

C: Carrier indicator. This indicates whether the modem is on-line.

B: Buffer capture. This indicates whether data is being captured to the
buffer. (see 3.1.3, Commodore key commands, C= B, C= O)

X: Script file active. This indicates whether a script file is currently
running. (see section 6, Scripts)

The number directly to the right of the status letters displays the
current baud rate.

The clock in the right-hand corner in both 40- and 80-column modes
is an on-line timer. It is reset to zero and begins counting immediately
after a modem connection is established. When the modem is
disconnected, the timer stops and retains its last value until a
connection is made again. The timer is useful when you are calling
long distance or are using an on-line service that charges by the minute
or hour. In 40-column mode, the clock counts seconds; in 80-column
mode, the clock updates every minute.

In 80-column mode, the extra width available on the status line is used
to display the current terminal emulation (see 3.1.1, Terminal
emulations), file transfer protocol (see 3.4.3, Selecting a protocol),
and the current time (see 1.1.10, Selecting a real-time clock device).

The status line may be turned off by pressing C= S in terminal mode
(see section 3.1.3, Commodore key commands, C= S).