Mastodawn

Now.. what about these EPROMS on the FCU Extender boards? Peeking under the label we can see that these are M27C512 EPROMS and I have tools to read them.

There's also another chip labelled as FCU UT-15, but this turned out to be a PAL (TIBPAL20L8), which would require building custom hardware for dumping (though I already ordered some parts for it).

For now is skipped as the ROM in the CORE CPU board jumper "ON BRD ROM" jumper isn't set.

#reverseengineering #eprom #minipro #flightsim #hacking

Jan Beta Oct 6

New video! I'm showing two (and a half) ways of getting the TL866 EPROM programmer to work in Linux.

YouTube: https://youtu.be/_oacXhtaLsk
PeerTube: https://makertube.net/w/kKdacAjugvbd6cDGyUSZew

#TL866 #EPROM #EPROMProgrammer #XGecu #MiniPro #Linux #LinuxMint #Wine #VirtualBox #Tutorial #HowTo #EPROMBurner

Jan Beta Oct 6

Using the TL866 EPROM Programmer in Linux

https://makertube.net/w/kKdacAjugvbd6cDGyUSZew

Using the TL866 EPROM Programmer in Linux

PeerTube

Khralkatorrix Sep 30

Found out my MiniPro TL866A maximum programing voltage for EPROM is somehow only 12V (measure from one of the two capacitors near the ISP connector after issue a write to "21V 2716 EPROM" from minipro's profile).

While I can use old Willem ERPOM 3.5 Programmer to program 25V ERPOM, it will require me to use my Windows XP PC that have parallel port on the motherboard, which are kinda in storage right now and not ready for use (too lazy to set it all up lol).

I have found forum post at https://www.eevblog.com/forum/testgear/modification-to-add-the-missing-21-and-25-volt-vpp-ranges-to-your-tl866ii-plus/ details how to add 21V or 25V EPROM support to TL866II Plus, also including TL866A.

The 10K resistor value for TL866A didn't work for my programmer as the voltage output are too low (about 18V), so, I have to modified the instruction a bit with these resistors added to a jumper connect to ground

- 5.6K to get 20.3V for 21V EPROM
- 10K (must also enable 5.6K) to get 24.4V for 25V EPROM

Below are the image of modification I did.

#minipro #TL866A #epromprogrammer

root42 Jun 7, 2025

My TL866-II+ won't read EPROMs anymore using #minipro on #macos! Can someone confirm this? TTL logic tests still work. Installed using brew.sh!

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Amand Tihon Mar 27, 2025

There were no picture of the AOpen AX65 #PentiumPro board on #TheRetroWeb, so I did my best with my #fp5 and it turned out OK.

I then proceeded to remove the BIOS chip and dump its content with the #minipro.

Now, when dealing with motherboards where the BIOS has a sticker with its version on it, I never know if I should update it in place and make the sticker lie, or replace the EEPROM with a freshly flashed one instead and store the original.

https://theretroweb.com/motherboards/s/aopen-ax65

#retrocomputing

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Daniele Verducci 🧉Mar 2, 2025

I wrote a very stupid and ugly #z80 #assembly to try it (I'm sure it is filled of errors and I will need a lot of debugging with the #logicprobe), but I could not write it to the #EEPROM . The #minipro errors out while checking the first byte after writing it. That's strange, because I'm using the same programmer and the same eeprom chip as before, and always worked. But in the meanwhile I changed computer, operating system and USB cable, so... troubleshooting time! Yay! 🙄