Thanks for the replies.
Terminal and the Unix boxes I connect to are set to VT100. No problems there. The problem is that Terminal's VT100 emulation doesn't bother with the top row of keys on the numeric keypad. I'm at work now on a PC, so I can't recall the names of the keys. The first one is "Clear", I think.
In Preferences I can remap some of the keys, but not these 4. As an interim solution, I have used Preferences to remap the F16-F19 keys which are right above the numeric keypad, but I'd still like all the numeric keypad keys to emulate a VT100. That means that the top row would behave as what DEC called PF1-PF4.
The editor in question is a third-party editor that emulates DEC's EDT editor. I could use other editors, but that one works particularly well for what I do and I know it from 25 years of working on DEC systems.
So, my main issue is that Preferences in Terminal doesn't seem to include the ability to remap those 4 keys. I'm trying to find a way around that so I don't have to pay real money for a better terminal emulator.
In the meantime, I will look at finding a way to remap the keys in the editor. I can do that, but I'll need to be able to turn it on and off, because when I'm at work I have a Windows PC and use a provided emulator that does a pretty good job.
Thanks again for efforts!