NEC SX Service And Reference Manual page 14

T
Operating Status LEDs — keeps you informed of your NEC Versa's
current operating status. See the following figure and list for each icon's
meaning.
A - Hard Drive
D - Scroll Lock
1-4 System Overview
Operating status LEDs
B - VersaBay III
E - Num Lock
Hard Drive — lights when the NEC Versa writes to or reads data
from the hard drive.
VersaBay III™ — lights when the NEC Versa writes data to or
retrieves data from a device in the VersaBay III.
Caps Lock — lights when Caps Lock is in effect.
Scroll Lock — lights when Scroll Lock is in effect.
Num Lock — lights when Num Lock mode is active.
C - Caps Lock