Last X after Classics

[PANAMATIK]

(01-28-2018 10:07 PM)Matt Agajanian Wrote:  Hi all.

Since LastX was implemented on HP-45s and higher, it would seem plasusible that LastX would be a built-in. So, since multiple registers were possible as evidenced by later Classics after the 35, why wasn’t there a Last X operation on the Woodstock HP-21?

The HP-21 was the only Woodstock calculator without RAM chip. It had only the ACT registers for stack, all calculatons and one memory storage register. No register was left for Last X.

Bernhard