HP HP-67 - Page 205

Subroutines 201
When you press (3, execution begins with {3, transfers out to
execute the 8 subroutine, and returns. This time Vb? — 4ac is
subtracted from —b, and root r, is computed. By using a subroutine,
seven steps of program memory are saved!
To key in the program and the subroutine:
Slide the W/PRGM-RUN switch weram [[[[IllruN to W/PRGM.
Press Display
8D 001 31 25 11
1 002 33 01] Stores a in R;.
RTN
o G 004 31 25 12
2 005 33 02} Stores b in R,.
0 006 35 22
o 5 007 31 25 13
3 008 33 03] Stores ¢ in R;.
D
a o 070 31 25 14
o 8 011 31 22 08
25 012
1 z;; =2 67 Calculates
07
2 Thx VB e
_— 1-
015 71 .
B 076 81
0 rw 017 35 22