HP 42S Version Speed Variation

[Gerald H]

To post #8:

Your 1st reading accords with my intention.

To post #8 & 11:

I have now run a new test, the result being:

Version A: 426s

Version C: 608s

The test was the factorization of the 11th repunit, 11,111,111,111. As you will see from the programme listing below, there are random elements involved - consequently 11,111,111,111 was set as the easily rememberd seed before the programme was invoked.

On both calculators registers 04 & 05 contained the same numbers at the end of the factorization, namely 128 & 49.

Here is the programme & sub-programmes involved:


0. { 92-Byte Prgm }
1. LBL “POBR”
2. STO 01
3. +/-
4. STO 00
5. CLX
6. STO 02
7. LBL 02
8. SIGN
9. STO+ 02
10. STO 04
11. STO 05
12. RAN
13. RCL* 01
14. IP
15. LBL 00
16. RCL 04
17. STO 05
18. R↓
19. STO 03
20. LBL 03
21. XEQ “SQM”
22. RCL+ 02
23. STO ST Y
24. RCL- 03
25. RCL 01
26. XEQ “GCF”
27. 1
28. X≠Y?
29. GTO 01
30. RCL ST Z
31. DSE 05
32. GTO 03
33. RCL 04
34. RCL+ ST X
35. STO 04
36. STO 05
37. R↓
38. LBL 04
39. XEQ “SQM”
40. RCL+ 02
41. DSE 05
42. GTO 04
43. GTO 00
44. LBL 01
45. R↓
46. RCL 01
47. X<>Y
48. X=Y?
49. GTO 02
50. TONE 3
51. END


0. { 42-Byte Prgm }
1. LBL “SQM”
2. STO ST Y
3. 1E6
4. MOD
5. STO ST Z
6. –
7. ENTER
8. X^2
9. RCL 00
10. MOD
11. X<>Y
12. R↑
13. STO* ST T
14. *
15. RCL 01
16. MOD
17. RCL- ST L
18. RCL+ ST L
19. RCL 01
20. MOD
21. +
22. RCL 00
23. MOD
24. +
25. RCL 01
26. MOD
27. END


0. { 16-Byte Prgm }
1. LBL “GCF”
2. LBL 00
3. MOD
4. LASTX
5. X<>Y
6. X≠0?
7. GTO 00
8. R↓
9. ABS
10. END

I would appreciate assistance.