HP 16500C Logic Analyzer (1999) Information

The HP16500 „logic analysis system“ consists of a mainframe which can hold several modules. The mainframe itself offers a color touch screen (9“), RS232, 10 MBit LAN, HPIB and connectors for Keyboard+Mouse (PS2).

There are modules for logic analysis, digital scopes and signal generators and even other purposes.

The concept is very flexible. If you have a mainframe, you can set up a powerful system from it.

I ordered my HP16500C in spring 2014 from a dealer in Santa Clara, CA, USA for about 330 Euros including customs.
Ebay text for the device was:

HP/Agilent 16500C Modular Logic Analysis System Modular Mainframe

Touchscreen with 2 of 16555D cards used, working order, no other parts, modules cables are included tested .

Later I ordered also a HP16532A, a 250Mhz DSO module to be inserted into the 16500 Mainframe and a16520 50Mhz pattern generator.

HP16500C Mainframe

My device is from 1998 or 1999, I the newest date codes I saw so far from inside are from week 06/1998.

Here is the ebay picture:

My 16500C (ebay pic)

At the top the cables can be seen. I fear there are no probes included. They can be easily bought on ebay too.


16500C Software

16555D timing analysis module

The 16555D state and timing analyzer offers a timing-analysis rate of 500 MHz and state-analysis rate of 110 MHz with 68 channels per card. Other features include memory depth of 2M and 4M in half-channel timing mode. Also included is the setup and hold time of 3.5/0 ns to 0/3.5 ns adjustable in 500 ps steps.

So I have 68 channels in 8M depth or 136 channels in 4m depth. This is much more than I will ever need. Timing diagrams can be captures at 500Mhz which is also much above anything I can believe of in my hobbyist lab.

Module-related documentation:

16532A 1 Gs/s 250 Mhz digital storage oscilloscope module

2 channel, 8000 samples acquisition memory per channel.

Documentation HP16532A

Module-related documentation:

16520A 50 MBit/s Pattern Generator

Tested in HP16500C Mainframe, its the card in slot „B“ in the pictures

Also includes:
Qty 2 of 16520-61603 Clock Probe Cable Pattern Generator Output
Qty 2 of 16515-63201 Probe Adapter with Test Lead
Qty 1 of 16520-61601 Input Qualifier Probe Cable

Pods are missing some wires and some wires are missing the ends where the grabbers attach.

If something is missing, these guys have many LA parts: http://www.bmius.com/c-120-logic-analyzers.aspx

Some Pictures of my device


1st boot.
The 16555D cards in slot A and B are identified as card number „035“ and thus are not integrated into the system. See text for analysis and solution.
The HP16500C can export screen dumps as TIFF and PCX files. Size is 576×368.

…and also pure B/W pictures









HV section and 9 inch tube



View on beefy inductors in the power supply.


Closeup to the right side of power supply


Tube-section is not from HP but from SONY.


Power supply information. Date code week 06 1998.


Power supply, cover removed.








Look into mainframe after removal of all cards and fillers. The PCB at the bottom holds the 68030 CPU and ll the controlling hardware. At the back there is the the backplane to connect all modules together.






68030 is the large chip at the left back. below are more closer looks.


View on the tube


Serial/parallel/GPIB connectors




68030 CPU


68030 CPU


Some Firmware, dated 1998



Bt475 or so, supposed to be the video chip





Three fillers installed


Air flow seems to be important in the HP16500


Power supply. Yes I voided the warranty seal.






HP16555D module: 500Mhz/125Mhz timing/state 68 channel logic analyzer with 4M sample depth

In my device came two HP16555D cards. They were detected by the mainframe, but not integrated in the system, so they could not be used on arrival of the device.

„Unrecognized card“ for HP16555D

An „analysis“ lead to the following facts:

  • Each module type is identified by HP16500 firmware by an ID. The ID for the 16555D would be 034.
  • For each module, a driver software must be installed in the drive/system directory of the mainframe. The name of the driver corresponds to the module id. For the 16555D, the driver is named SYS_034.
  • My mainframe detects the two 16555D modules with the wrong IDs, namely 035
  • The ID 035 corresponds to a 16555D that is configured as a slave in a master slave  configuration.
  • The master slave config is done using ribbon cables. Even the standalone configuration requires the correct insertion of a small 2×10 ribbon cable. My two cards did not have this cable 🙁

So the problem arrises from two missing cables. It is a pitty that they are missing… The ebay seller did not say that the cards are working, so I cannot complain 🙂

Further information on this topic:

  • Thread in yahoo groups with someone with the same problem who bought the cables from Agilent and succeeded with that
  • Correlation list for modules and their driver names
  • Thread where connector type is listed, also for to 50-pin intermodule ones

Solution approach

The reqired cables are still available from Agilent/HP. They have the part number 16555-61605 („2x 10 pin ribbon cable“). The cable costs (in 2014) about 35 Euro,

Building the cable myself requires connectors and the ribbon cable. From the internet I found:

  • Connectors used by HP/Agilent are Tyco Electronics 1-111196-8. from the „ampmodu system 50 connectors“ series.
  • Ribbon cable is standard 0,64mm 20 pole. This kind of cable (then with more lines) is e.g. used with 80 pin PATA connector cables for IDE harddisks.
  • The cable to build reverses the pin numbering. This means that Pin1 of the first connector is Pin20 of the second connector.

I ordered cable and connectors from digikey. After only three days they arrived from USA!

First draft how cable and connectors must be connected together


The selfmade cable with the Tyco connectors


My DIY cable inserted on the module

After adding the cables, the LA modules are recognized. Yahoo! The image below lists both modules.

Yahoo! the LA cards are recognized!

Below are some images from the 16555D module.



Master slave configuration is done using these connectors. A cable is required at least. I bought the modukles WITHOUT that cable 🙁 See text for further infos,.



Master/Slave config are. The 2×10 pin cables that configure the card (as standalone or in a master/lave config) are missing, what a pitty…



Input section


main controller section, maybe two FPGAs?


RAM section


Power supply and connector to mainframe section




This is the second card. It has a „refurbished 1998“ sticker close to one of the main controllers















Interesting detail on 16555D PCB. A kind of inductor?








HP16532 module: 250MHz 1Gs/sec 2 channel oscilloscope with 8K sample depth

This module came from another ebay seller. Also from california.

HP16500 with HP16532 oscilloscope module added.


HP16532 display. A signal is in channel 2, channel 1 has no signal.











16520A 50 MBit/s Pattern Generator

And some pictures of the 16520A board.







Mixed mode display

After getting also an oscilloscope card for the HP16500, I tried out the mixed mode display feature, meaning acquisition data from different modules on the same display, here from both logic analysator and scope module.

Group Run with LA and Oscilloscope module in one group.


Mixed mode display of the group. Lab1-0 .. Lab1-3 are Logic analyzer traces, C2 is channel 2 of oscilloscope.
The display is just for testing an analogue signal that sinuses in the TTL level area, and is thus also recognized as 0/1 signal by Lab1-0.


Trying out time markers (the vertical dotted lines) …

Enabling remote control via X Windows on OpenSuse

Hp16500C allows remote control via X WIndows. Everything that can be entered via the touchscreen can also be entered via mouse and keyboard then.

On OpenSuse, X is „closed“ by default. This means noone can connect to the X Server by default.

To enable remote access to yor X Server, enter

YAST->Security->Security Center->Overview. There enable the remote access to the X server.

Then, reboot. Do a

xhost +

then and try to connect from HP16500.

Adding HP16500 custom fonts to OpenSuse X

HP has created two Fonts that are optimized for the display on remote X servers. On my OpenSuse 13.1 system, If the custom fonts are not loaded, the HP16500C freezes when opening a dialogue that uses the large fonts and needs to be rebooted. So the fonts are actually required to use the remote X control feature.

These fonts are located on the harddisk in the system directory or can be copied from DISK1 directory from the software distribution. They are called LG165.BDF and SM165.BDF. LG means large 15px, SM means small 14px.

On OpenSuse, copy these files to the directory


The fonts directory is re-scanned using the command


The fonts can be listed with


If they appear in the list then, they are known by X Server:

dennis-pc:/usr/share/fonts/misc # fc-list|grep 165 /usr/share/fonts/misc/SM165.BDF: Fixed:style=Regular /usr/share/fonts/misc/LG165.BDF: Fixed:style=Regular

The fonts can be viewed with e.g. kfontview. For me, a reboot was required to use the new fonts.

Further Readings