AM2732B and TL866ii+ - Page 1
Forum section: electronics / projects

author: Wawavoun
author_rank: Regular Contributor
timestamp: April 13, 2021, 04:04:21 pm
content: Hello there,I have two AM2732B eprom. I assume they are not counterfeit because writing is acetone resistant...The marking say "12.5V pgm", datasheet say same, so TL866ii+ should do the job !They are in the supported ic list and after selecting Xgpro parameters look good (VPP 13V, VDD write 6.5 V, VCC verify 5 V, pulse delay 500 µs).Pin detect, blank check and reading work well.But there is no way to program these eprom.Immediately after writing sequence start I got the message "Program failed". No progress bar etc....Log file don't give any valuable information.The problem is the same on both eprom, also under windows 10 or linux+wine.With a pulse delay of 1 ms problem is the same.Anything I can try to improve the situation ?Also : what means "VDD write" and "VCC verify" into Xgpro ?Thanks for your advice.Philippe

author: Wawavoun
author_rank: Regular Contributor
timestamp: April 13, 2021, 04:32:48 pm
content: I just give a try with minipro.I notice that after more or less 6 trys with pulse at 12500 µs the error switch to the second byte... Repeating again 6 trys and the error then switch to byte 3...So now I will run minipro without verification (so it goes to eprom end even with error) and I will do that 10 times for security...Will see...

author: wraper
author_rank: Unknown
timestamp: April 13, 2021, 04:43:10 pm
content: Quote from: Wawavoun on April 13, 2021, 04:04:21 pmEPROM counterfeits are immune to acetone by default. They remove old paint marking with solvent and apply new marking with laser. You should check if silicon die looks as it should.

author: ChristofferB
author_rank: Frequent Contributor
timestamp: April 13, 2021, 04:53:06 pm
content: I have had many issues with the tl866 and 2716 and 2732 eproms. I'm unsure if it's the chips or the burner but I've resorted to just making pinout adapters and using the lower half of a 2764

author: Xenon
author_rank: Contributor
timestamp: October 04, 2021, 01:49:16 pm
content: Yes, old topic but same problem.My TL866II plus will not program a 2732 from Intel, TI, AMD, ST. They all fail immediately.Tried 2764, 27128, same result.Tried 27Cxxx and they work fine!Seems like the current draw of the old eproms is too high.Checked the 5V at the usb connector of the TL866, that doesn't drop below 5V.It must have a weak internal power supply. Could not read old masked roms either, Vcc dropped to just above 3V.Will look for another programmer, this is unusable for me as I use these old eproms most of the time.The component test function is nice, the only reason to keep this thing from ending in the bin.

author: Dilbert66
author_rank: Newbie
timestamp: January 21, 2022, 05:40:31 pm
content: I know this is an old thread but for those having issues with 2732's in the TL866II, there is a software bug I found in the latest Xgegu software that does not set the CE line correctly. In order to program 2732's you need to put a jumper between pin 18(CE line) of the chip and the gnd pin. This will force the CE line low and allow programming. You can then program the chip as normal. You might need to uncheck "Pin Detect" .Of course, you need to make sure you have the correct vpp voltage set.