Products > Test Equipment
Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)
SilverSolder:
I did a scatter plot of that data, and it doesn't seem to show any particular tendency for temperature dependence.
joeqsmith:
Now that I have something other than hype (thanks again for looking at it), I ordered one of these low cost, latest generation programmers mentioned here. Maybe we can address the some of the problems with it.
Yeah, it doesn't appear to me that the readings correlate to temperature as well.
https://www.youtube.com/watch?v=-0zPDfNVXjU&feature=youtu.be
SilverSolder:
I've replaced the 21V TI EPROMs with Intel 12.5V EPROMs in four different controllers now, and they all seem solid. The TL866CS seems to have no problem programming the 12.5V Intel EPROMs, unlike the high voltage TI chips. The programming worked first time, and worked first time in the actual circuit too. So, the TL866 can still be considered a useful programmer, as long as you realize that the spec for the new model (max 18V chips) actually applies to the older models too!
bdunham7:
--- Quote from: SilverSolder on February 17, 2021, 04:33:58 am ---I've replaced the 21V TI EPROMs with Intel 12.5V EPROMs in four different controllers now, and they all seem solid.
--- End quote ---
What part number EPROM was that?
--- Quote ---So, the TL866 can still be considered a useful programmer, as long as you realize that the spec for the new model (max 18V chips) actually applies to the older models too!
--- End quote ---
I've actually looked for the older model at times, but I guess what you are saying is that they didn't actually change the product, they changed the specification to reflect the products shortcomings! Is the software the same for both versions?
SilverSolder:
Yes, I think they "fixed" the problem by changing the spec... for most people, the lack of high voltage EPROM capability is unlikely to be a problem, so they deemed it not worth the effort and cost to fix it properly, most likely.
The chips that are working for me are labeled Intel D2764A, in the programmer software I selected "Intel 2764A @DIP28".
I believe the software is different between the older and new model TL866. The new software has apparently dropped any mention of the high voltage chips (since they can't be programmed anyway). I don't think the old software will work on the new programmer, at least not without downgrading the firmware in the programmer.
But there are many workarounds:
1) use 12.5V EPROM chips like the Intel D2764A which are still supported in the new TL866II (working for me now),
2) use a modern EEPROM that is believed to be a drop in replacement: AT28C64B - (I haven't tried it yet) - This may be the most reliable way to get the job done with a TL866, since we are now dealing with a well behaved modern chip.
3) add a more serious programmer to your arsenal that can deal with high voltage NMOS chips and add confidence that these temperamental chips are done properly and durably.
So, it isn't really a showstopper that the new model can't do 21V - neither can the old model! - it seems a good option to just get the current model and be very happy with it, as it supports even more devices than the previous models.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version