HP 54710A User's Reference Manual page 22

Plug-in The plug-in is for analog signal conditioning. The plug-in scales
the input signal, sets the bandwidth of the system, and allows you to
choose the input coupling and input impedance. One output of the
plug-in is an analog signal that is applied to the hybrid on the acquisition
board inside of the mainframe, another output is a trigger signal that is
sent to the time base/trigger board.
CAL Table The CAL table automatically adds the calibration factors to
the sampled data. The result is referred to as adjusted data, and it is
sent to the system bus. The CAL table increases the throughput of the
oscilloscope because the CPU now reads calibrated data, and does not
have to explicitly correct it. This is faster than using a software solution.
Microprocessors and coprocessors There are two 32-bit
microprocessors, one 32-bit coprocessor, and one 16-bit coprocessor in
the mainframe.
•
Motorola 68020 A 32-bit microprocessor that controls the system
hardware, and also acts as a traffic controller on the system bus.
•
Motorola 68882 A 32-bit coprocessor that performs all of the floating point
math.
•
TMS34010 A 32-bit microprocessor that draws data on the display.
•
HP custom graphics coprocessor A 16-bit coprocessor that controls the
gray scale persistence mode, and also writes blocks of data (like the
markers and display background) to the display.
How the Oscilloscope Works
Hardware Architecture
1–5