SUCCESS!!!!
Today, I was able to remove the Dallas chip from my A5 board and read the calibration data to a file! Then I promptly wrote it to the new Dallas chip and everything worked fine. What a relief! The original chip in my 2445B has a date code of 9026. That is a 25 year old battery That was still working. Anyway, as soon as the caps and IC socket arrive, I'll put it all back together and start the channel 1 diagnostics. I was hesitant to spend a lot of time of fixing that issue until I was sure I would not loos the calibration info in the Dallas since I lack the necessary equipment to perform a recalibration.
On a side note, I was able to read the chip with both the MiniPro TL866 and the EasyPro 90B. One strange thing about using the 90B. I was doing some experiments when I first got it and the new Dallas chip. I would program one of the bin files I have downloaded, and it would say everything was programmed correctly. When I would run a verification of the data on the chip, it would have two errors. Always in location 000000 and 000040. So I read my original chip in both programmers, and the data came out exactly the same. I could program the chip with the TL866, and it would program perfectly. I could read the chip in the 90B, and it would be correct. Strange to say the least. Anyway, I have a couple of copies of the data on two different computers and burned to a CD, as well as programmed on the new Dallas chip. I will be programming it to one of the FM1608 chips for safe keeping too. I know it is probably overkill for a scope that is 25 years old, but I don't want to take any chances. Of course, if I had lost the cal data, I would have been forced to pick up even more test gear. Hummm.......
Mitch
Here is the calibration file from my 2445B if anyone wants it.