SR-52->HP-67 Keycodes efficiency

[Matt Agajanian]

Hi there.

Even as TI’s technology was robust, could they have developed and fully-merged keycodes even as early as the SR-52/56 generation?

Also, by the time the TI-58/58C/59 was introduced, I’m certain TI could’ve implemented a multi-keystroke fully-merged system. Besides, since SR-52 mag cards were incompatable, why didn’t TI use fully-merged keystrokes for the 58/59? I could see, if SR-52 mag cards were compatable, the keycode structure would need to remain identical. But, since there was no backward-compatability, why did TI hold to such a memory-hungry keycode system?