(HP-67) The Use of a Programmable Pocket Calculator in Clinical Dietetics

[Dieter]

(12-29-2018 07:16 AM)Thomas Klemm Wrote:  The use of x>y? puzzled me in the listing of the BASIC PROGRAM (Cumulative Totals):

Code:

LBL 2     21   02
f x>y?    16   34
EEX          - 23
3         03
÷            - 24

The same is true for the "Nutricional Survey" program, cf. line 60 at LBL 2:

Code:

LBL 2     21 02
RCL (i)   36 45
f x>0?    16 44
1            00
0            00
0            00
x           -35

Here instead of the x>0? test obviously a FRAC command is the right one.

So it's...

Code:

LBL 2     21 02
RCL (i)   36 45
f FRAC    16 44
1            00
0            00
0            00
x           -35

BTW, since the listings include print commands and even the HP97 key codes, I wonder why the program form was filled in with a typewriter and even by hand for special characters. Why didn't they simply attach a printed program listing? This also would have avoided the mentioned errors.

(12-29-2018 02:06 PM)SlideRule Wrote:  I will search for follow on errata; most excellent observation.

So here is another error. Which does not mean there may not be more. #-)

Finally, looking at the user instructions: are "1ary" and "2nd.ary" common abbreviations for "primary" and "secondary"? And is "to tip" a common verb for keying in a value? Just curious since English is not my native language.

Then take a look at the references. There are two papers that sound very interesting: Goggin, M. S., Lawrence, D.: "Dietary calculation by pocket-size computer" and "Pocket-sized solution to the dietitian's workload", both published in 1975. Could these possibly refer to the HP65 ?

Dieter