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Reverse engineering Tektronix TDS3GV module for TDS3000 series oscilloscopes?

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sicco:
Here's where I am with my attempt to make a super TDS3GV / TDS3EM plug-in module. Nothing is tested yet - still waiting for JLCBCB.

Design objectives:

1. An alternative to the RTC Dallas DS1742W chip on the scope main board. All but one DS1742 pins are on the 100 pin expansion connector. So I'll have a DS1744W with battery/xtal cap on this board.
2. A DB9 serial port. Isolated. But if needed, with a DB9 Bluetooth adapter +5V powered via pin 9.
3. An isolated USB version for that same serial port because PCs no longer have DB9 COM ports these days...
4. Accommodate the ESP32 DevKitC so that we can do the WiFi trick as per https://www.eevblog.com/forum/testgear/reverse-engineering-tektronix-tds3gv-module-for-tds3000-series-oscilloscopes/msg3014688/#msg3014688.
5. Allow for FTDI USB-TTL 6 pin header serial port.
6. Add RJ-45 10BaseT Ethernet via a legacy MC68160.

For the DS1744W alternative RTC I still need to work out how to best mute the existing DS1742W on the main board. The latter seems to get its /CS from the PowerPC XPC860 /CS2 at pin D4. Unclear yet if my assumption is right that the RTC is mapped at address 0x000000 and the CS can thus be derived from just the A0-A19 address bus. If not then it will be an extra flying lead from /CS2 pin D4 of the PowerPC, to my board's DS1744W. Maybe route that via EXTCLK on the 100 pin connector. Stay tuned...

 

blackfin76:

--- Quote from: sicco on November 03, 2020, 11:20:46 am ---Here's where I am with my attempt to make a super TDS3GV / TDS3EM plug-in module. Nothing is tested yet - still waiting for JLCBCB.


--- End quote ---

Goed bezig  :-+

james_s:

--- Quote from: pmercier on June 20, 2020, 12:27:26 am ---I know I promised to publish and share my results last week end. I got delayed by mother nature who put a wasp nest inside my car ... they got me pretty bad. At least I wasn't driving at that time.

So now that am on foot again, I took the time to create a build log for the project I had in mind when starting the reverse. All of the informations are posted there : https://hackaday.io/project/172242-extension-card-for-tds3000-scopes/log/179520-the-actual-informations

Only the two last logs have informations not present here.

Hope it'll be useful.

No original card was inserted when taking this photo ;)


--- End quote ---

Nicely done! That's quite a clever way of identifying the type of expansion module, using parts that were cheap in the late 90s.

sicco:
My plug-in boards arrived from JLCPCB - DHL shipping takes > 1 week these days.
It works nicely - after fixing the errors I made. No Ethernet though.

Details: see cross reference https://www.eevblog.com/forum/repair/reverse-engineer-dallas-ds1742w/msg3324732/#msg3324732

mankan:
I also got my boards yesterday  :)

Soldered it up today and upgraded to TDS3054 and then a FW upgrade. I've not yet programmed the ESP (Wemos mini D1). The plan is to have a simple web server that publishes screen shots.

Should I connect the /RST line to the ESP RST pin?

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