the orignal card stack had a bug in the last card (4 char halt command w/o WM) and would only work on very old VDC versions.
(cardload 1407 calculator v2 DEFECTIVE.txt)

thx to discord user mstram for pointing this out,
and to user DieMade for the suggested fix.

uploaded corrected version "cardload 1407 calculator v2.txt" on 2023-09-12

To use the program, set 1401 to RUN, put the stack into the 1402, LOAD it, and hit START to start it.

Same error affected the "H1401 program sheet v9 - 1407 calculator v2.ods",
now corrected in "H1401 program sheet v9a - 1407 calculator v2.ods"