Agilent Technologies Agilent 8648A, HP8648A Slot for memory cards that are inserted to load software, or to record test results.

The Test Set’s Features
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Non-Bracketed Keys and Memory Card Slot
Non-Bracketed Keys
The POWER key − turns the instrument on or off.
The SHIFT key is used to select the blue-labeled functions listed above
certain keys.
The CANCEL key is used to cancel an entry in progress, or stop a
running IBASIC program.
The key is used to move the cursor to the left when entering
numbers in a field, thereby erasing the previous characters.
The Memory Card Slot
Slot for memory cards that are inserted to load software, or to record
test results.
CURSOR CONTROL
PUSH TO SELECT
CANCELSHIFT
k3
K3
k4
ASSIGN
k5
RELEASE
456
123
0+
_
dBm
MHz
V
%
kHz
mV
s
Hz
µV
ms
%
dBµV
Ω
ppm
W
NO
ON/OFF
YES
MEMORY
CARD
AUDIO IN LOHI AUDIO OUTSQUELCHVOLUMEMIC/ACC
ANT IN
DUPLEX OUTRF IN/OUT
POWER
F
FON