Is that true for the earlier HP's too?

> Ever since then, I keep an emulated HP48 with me.

Oddly, even though I used 48's and still have a couple in a drawer, I've settled on an HP42S emulator. (This was a lower end, but still nice, HP that was more directly a successor to the 41. In some ways, it feels more direct and calcualtor-like than the 28/48/etc series)