(55) Rallying …

[SlideRule]

An extract from 73 (magazine), Rallying the HP-55 - gentlemen, start your calculators!, JUL 1981, pgs 80-82.

Here's a program for your HP-55 calculator (which can be adapted to other programmables) that will help you hit those rally checkpoints on the nose …

includes description, example, flowchart, listing etc.

BEST!
SlideRule

[Greg]

After a copy and paste from the PDF, a clean up from that, and summarizing the instructions:

Code:


HELP
[
Rallying
https://www.hpmuseum.org/forum/thread-12415.html

Before Setting Out
A. Load program, switch to RUN, key BST.
B. (start time, H.MS) STO 1
C. (start speed) STO 8 STO 9
D. Reset Odo then CLx STO 0 STO 3 STO 5
E. 1 STO 6

During the Rally
G. (odo) R/S -> (target time, H.MS), check watch

Speed To Next Way Point
G. as above, then
H. (new speed) STO 8
]
PROG
49
01: 33       : STO
02: 07       : 7
03: 34       : RCL
04: 09       : 9
05: 34       : RCL
06: 08       : 8
07: 32       : g
08: -19      : x=y? 19
09: 33       : STO
10: 09       : 9
11: 34       : RCL
12: 04       : 4
13: 33       : STO
14: 01       : 1
15: 34       : RCL
16: 03       : 3
17: 33       : STO
18: 00       : 0
19: 34       : RCL
20: 07       : 7
21: 33       : STO
22: 03       : 3
23: 34       : RCL
24: 00       : 0
25: 51       : -
26: 34       : RCL
27: 06       : 6
28: 81       : /
29: 34       : RCL
30: 08       : 8
31: 81       : /
32: 32       : g
33: 01       : ->H.MS
34: 24       : FIX
35: 04       : 4
36: 34       : RCL
37: 01       : 1
38: 31       : f
39: 41       : H.MS+
40: 33       : STO
41: 04       : 4
42: -00      : GTO 00
43: 34       : RCL
44: 06       : 6
45: 71       : *
46: 34       : RCL
47: 05       : 5
48: 61       : +
49: -00      : GTO 00
END

There's more to it in the article (I've left the calibration run and backtracking option out of the HELP part, but the program listing is complete and includes them).

I never had a HP-55 so it was surprising that this program gave me quite a sense of nostalgia. It started when I saw keycode 81 as "/". The later woodstock calculators don't have a row 8 ... with only one exception. The one I used most is that exception. STO and RCL here are familiar keycodes and, whilst not in this program, 84 always causes me to think of R/S.