System Overview Theory
HP 16500C
The HP 16500C is the mainframe for the Logic Analysis System.
Microprocessor Board The microprocessor board contains all the interface circuitry
for managing data flow between the mainframe components and the optional boards. The
microprocessor used is a Motorola 68EC030.
Mother Board Located on the mother board are the intermodule bus and the fan speed
control circuit. The mother board consists of seven card slots: five are used for the
optional acquisition and stimulus boards, one for the microprocessor board, and one for
the power supply. The only active components on the mother board are for the fan speed
control circuit. The heat-sensing thermistor for the fan speed control circuit is located on
the microprocessor board.
Flexible Drive The flexible disk drive uses 3.5-inch, double-sided, double-density disks.
All of the disk drive control circuitry is located on the microprocessor board.
Hard Disk Drive The hard disk drive, located beneath the rear fans, is a 540 MByte
DOS-formatted high-reliability drive. The disk drive circuitry is located on the
microprocessor board and on the hard disk drive assembly.
Color Module The color module display is an eight-plane color system. Each plane has
a resolution of 576 pixels by 368 lines. The display is non-interlacing and is refreshed
every 1/60 of a second (not synchronized to the ac line). The horizontal and vertical sync
signals are generated by the CRT controller located on the microprocessor board. Color
information for the display is generated on the microprocessor board. The display RAM
and the color palette are also located on the microprocessor board.
Front-Panel Board The front-panel board is based on the Hewlett-Packard Human
Interface Link (HP-HIL) and consists of the touchscreen system and the front-panel
control knob. All of the touchscreen and knob circuitry of the HP-HIL is located on the
front-panel board and the controller for the link is located on the microprocessor board.
Power Supply The power supply provides the following regulated voltages:
-12.0 Vdc +5.0 Vdc +3.5 Vdc
+12.0 Vdc -5.2 Vdc -3.25 Vdc
+120 Vdc
The +120.0 V supply is used only by the color module. Current limiting, overvoltage
protection, and thermal shutdown are provided for all supplies.
I/O Board The I/O board is a passive circuit board that expands the external
input/output capabilities of the CPU board. The RS-232-C, Parallel Printer, Trigger BNC,
and PS2 connectors are on the I/O board. Cabling connects these ports to the CPU board.
Theory of Operation
The HP 16500C Logic Analysis System
8–4
To Next Page
Loading...
Need help?
General
