EEVBlog #1159 Dave Jones reviews the DM42

[Gerson W. Barbosa]

I quite don’t agree with the title. I don’t have a DM42, but I have two WP34S calculators with similar precision. Actually, the result of the forensic test is slightly closer to 9 on mine. Nonetheless, a great and enthusiastic review.

Anyway, I’d love to get myself one just to run my Reciprocal Fibonacci Constant program on it. The equivalent WP34 program has only 43 lines (including LBL & END), but it doesn’t get all 34 digits right as expected for argument 9 (because of the built-in FIB function not being duly rounded to the nearest integer in double precision mode when arguments are integer).

Code:


00 { 103-Byte Prgm }
01▸LBL "RFC"
02 STO 03
03 XEQ 01
04 STO 05
05 +/-
06 SIGN
07 RCL 03
08 RCL+ ST Y
09 Y↑X
10 STO 02
11 LASTX
12 XEQ 01
13 STO 06
14 CLX
15 STO 01
16 RCL 03
17 STO+ ST X
18 ENTER
19 XEQ 01
20 RCL- 02
21 X<>Y
22 1
23 +
24 XEQ 01
25 STO 04
26▸LBL 00
27 RCL+ 01
28 RCL× 02
29 RCL 05
30 1/X
31 STO+ ST T
32 X<> ST L
33 X↑2
34 X<>Y
35 ÷
36 STO 01
37 X<> 05
38 X<> 06
39 STO 05
40 STO- 06
41 X<> 04
42 X<>Y
43 STO- ST Y
44 STO 04
45 DSE 03
46 GTO 00
47 RCL+ 01
48 1/X
49 RCL+ ST Z
50 RTN
51▸LBL 01
52 0.5
53 ASINH
54 ×
55 E↑X-1
56 5
57 SQRT
58 ÷
59 NOT
60 +/-
61 END