Theory of Operation
3–4
TDS 340A, TDS 360 & TDS 380 Technical Reference
Processor System. The processor system contains a 68331 microprocessor that
controls the entire instrument. The processor passes waveforms and text on to the
display system. The Main Board contains both the processor and display
systems, in addition to the firmware ROMs.
Display System. A display controller IC processes text and waveforms. The
display system sends the text and waveform information to the monitor assembly
as a video signal. The display system also generates and sends vertical (VSYNC)
and horizontal (HSYNC) sync signals to the monitor assembly.
All information (waveforms, text, graticules, and pictographs) is displayed by
the A26 Monitor. It generates the high voltages necessary to drive the display
tube. It also contains the video amplifier, horizontal oscillator, and the vertical
and horizontal yoke driver circuitry.
The processor system sends instructions to and receives information from the
Front Panel Processor on the Front Panel Board. The Front Panel Processor reads
the front-panel switches and ports, and reports any change in their settings to the
processor system. The Front Panel Processor also turns front panel LEDs on and
off.
The Front Panel Processor reads the front-panel menu switches and sends any
changes in menu selections to the processor system. The ON/STBY button is not
read by the Front Panel Processor but passes through the Front Panel Board and
the Main Board to the A20 Low Voltage Power Supply.
The front panel also generates the probe compensation signal.
The floppy disk drive system consists of the A5 floppy interface board that
connects to the main board. A 26-pin cable connects the floppy disk drive to the
floppy interface board, supplying both power and data to the drive.
The drive is 2 Mbyte double-side, high-density unit that uses 3.5 inch IBM-for-
mat disks.
The A2 Option 14 board has GPIB, RS-232, and Centronics interfaces for
external control and hardcopy operations. Also included is the A3 board with a
VGA video output port and a power connector for the Option 3P printer.
Monitor
Front Panel
Floppy Disk Drive
Option 14
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