HP HP-67 - Protected Secondary Storage Registers

74 Storing and Recalling Numbers
Press Display
37850 Constant placed in [
register.
2 7.57 Capacity in liters of 1%
tank.
14.40 8 54.50 Capacity in liters of 2nd
tank.
550 8 208.18 Capacity in liters of 3™
tank.
Protected Secondary Storage Registers
In addition to the primary storage registers, your HP-67 also provides
you with 10 secondary storage registers that are protected; that is,
you cannot access the secondary storage registers directly with
and @8 . These registers are used most often by the statistical
functionfJ (about which more later) and for programming purposes.
However, they can be accessed manually from the keyboard by using
the key.
For example, in order to store a number from the displayed X-register
into secondary storage register Rgs, you first store the number in
primary register R and then press [ (primary exchange
secondary). When you press (F35), the contents of the primary
registers R, through Ry are exchanged with the contents of secondary
storage registers Rg, through Rge. No other storage or stack registers
are affected.
For example, to store 16,495,000 (the number of persons carried daily
by the Japanese National Railway) in secondary storage register Rgs:
Press Display
16495000 16495000.
5 16495000.00 Number stored in register
Rs.
0 16495000.00 All secondary registers
exchanged with num-
bered primary registers,
so number is now stored
in secondary storage
register Rgs.