Introducing the HP1631D

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The HP1631D is a logic analyser. It allows you to record timing and logic info on several channels simultaneously. Triggers are very flexible: You can start a timing trace efter a certain squence of bytes or vice versa. You can also load inverse assemblers that lets you decode processor mnemonics or GPIB bus info. The 1631D also has two analogue channels so that it can be used as a (limited) storage scope.

Buying one on eBay

Used units can be found on eBay starting at 50$. Make sure you get one with pods though

Technical odds and ends

Replacing the fan

The standard fan is LOUD. I replaced mine with a temperature-controlled one.The new fan is a Pabst 4312MT which has a separate NTC sensor. I located the sensor between the logic PCBs. I tested with two thermometers inside, one between the logic boards and one on the cooling fin of the PSU. The first one oscillates between 30 and 31 degrees, the second between 46,6 and 48,8 degrees.

Connectors

The connectors that connect to the pods have a tendency to go awol. In that case, new flying leads can be manufactured, using crimp connectors type 44159 from Biltema

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Uploading inverse assembler files

Inverse assembler files for protocols and processors are available. Normally you would load them from a floppydrive (or HPDisk), but you can upload them via my utility by changing the start byte to XX (below). Thanks to Miguel Gullon for that tip!

Config
Inverse assembler

Useful links

There is tons of good information available on Rudis Wiki

Disclaimer

This information and the circuits are provided as is without any express or implied warranties. While every effort has been taken to ensure the accuracy of the information contained in this text, the authors/maintainers/contributors assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. I disclaim everything. The contents of the articles below might be totally inaccurate, inappropriate, or misguided. There is no guarantee as to the suitability of said circuits and information for any purpose whatsoever other than as a self-training aid. I.E. If it blows your equipments, trashes your hard disc, wipes your backup, burns your building down or just plain don't work, IT ISN'T MY FAULT. In the event of judicial ruling to the contrary, any liability shall be limited to the sum charged on you by us for the aforementioned document or nothing, whichever is the lower. I will not be held responsible for any damages or costs which might occur as a result of my advice or designs. Nor are you allowed to use any of my designs for commercial purposes without my written authorisation.

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