| Products > Test Equipment |
| Some old school instruments showing how it's done (HP 3325A and Fluke 8506a) |
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| SilverSolder:
It does look like your earlier calculations were right. And your setup appears to be beating the worst case? ...Meanwhile, I'm still being dogged by bad EPROM programming... one of the meters refuses to boot now - the EPROM appears to be "leaking bits". I'm wondering if it's time to invest in a better programmer, or just use the Intel EPROMS that it seems to do better with... |
| joeqsmith:
I'm not sure what the typical numbers would be for this part but I'm not surprised that even with the meter, it's coming in tighter. I plan to try the highest range next. Looking to see what I can use to get me around 0.1G. When I was using windowed parts, it seems like we could get maybe 20 or so cycles on them. We would mark them each time they were programmed. We would never use anything but virgin parts for something what was sent outside of engineering. If the used parts were only programmed once, they should be fine. I wonder if you can get NOS parts still. In those days we had a DataIO that had a serial port on it. More than once I was using the built-in hex keypad to enter the data. For home, I made one for my VIC 20 and later my IBM AT. Eventually I bought that EETools programmer. That was a big step up. It's very rare I have a need for one now and was thinking your sub $100 programmer may be the ticket to replace mine. |
| SilverSolder:
I decided to splurge on a slightly more upscale programmer - let's see if the problem is with the TL866CS, or if all seven TMS2764 chips that I have here really are bad! I suspect programming the older chips may require a more "meaty" programmer than the modern, well behaved chips. After all, the old EPROMs were designed back in the day when the engineer drove to work in a 455 Pontiac Trans Am, right? |
| joeqsmith:
The one person had written about the low programming voltage on the later revision. Maybe the older ones also had a problem as well. Seems like as long as they followed the data sheets, it should work fine. You can see that one I made for my VIC-20 is pretty barbaric. Maybe just check it with a scope before investing in another programmer? The very first picture on the left is what we had. The old 29. https://en.wikipedia.org/wiki/Data_I/O I have now replaced the 60 ohm with a 100M. *** Caddock 10ppm part was the best thing I could come up with. Had to use some foil to tame the static. |
| SilverSolder:
LOL that foil shield is another $800 part, for sure! ...re programmer, the one you used looks like it could weld the pins together if it needed to! I had a Vic 20 as well, back in the day... |
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