Search found 359 matches

by Thomas Okken
Wed May 22, 2019 1:02 pm
Forum: Usage tips, tricks and problem reports
Topic: DM42- clock losing time
Replies: 75
Views: 3917

Re: DM42- clock losing time

Presumably, a car clock will be temperature-compensated, to deal with the wide range of temperatures inside cars. Also, many car clocks are adjusted by RDS if you listen to the radio. This is the case with mine (Vauxhall/Opel Insignia estate) so I don't even need to adjust it when changing to/from ...
by Thomas Okken
Tue May 21, 2019 10:31 am
Forum: Usage tips, tricks and problem reports
Topic: DM42- clock losing time
Replies: 75
Views: 3917

Re: DM42- clock losing time

Out of curiosity, I measured the accuracy of the clock in my car. It's a very basic clock: 12-hour digital display, hours and minutes only, not even an AM/PM indicator, and a single button for setting the time. But quite accurate: over 7.5 days I couldn't measure any drift, and given that my measure...
by Thomas Okken
Wed May 15, 2019 5:20 pm
Forum: DM42
Topic: Benchmark Speed?
Replies: 11
Views: 438

Re: Benchmark Speed?

Calculators today are a lot faster than 50 years ago! And the DM42 runs somewhat slow in order to conserve the battery. Compare Free42 running on an iPhone, 64-bit code on a fast CPU; the numbers I get for those two benchmarks are 5,593,077 and 481,193. ¡Caramba! Any faster and that machine will gi...
by Thomas Okken
Wed May 15, 2019 12:42 pm
Forum: DM42
Topic: Benchmark Speed?
Replies: 11
Views: 438

Re: Benchmark Speed?

Calculators today are a lot faster than 50 years ago! And the DM42 runs somewhat slow in order to conserve the battery. Compare Free42 running on an iPhone, 64-bit code on a fast CPU; the numbers I get for those two benchmarks are 5,593,077 and 481,193.
by Thomas Okken
Wed May 15, 2019 12:15 pm
Forum: Usage tips, tricks and problem reports
Topic: DM42- clock losing time
Replies: 75
Views: 3917

Re: DM42- clock losing time

My test has run long enough to show results: DM42: 13 s fast after 88 h = 41 ppm HP-50g: 3 ¼ s slow after 50.3 h = 18 ppm The DM42 is a beta unit, SN 62. I do have a data logger recording temperature and humidity in the same room, so I could provide those numbers if necessary. I didn't keep track of...
by Thomas Okken
Sun May 12, 2019 10:57 pm
Forum: Usage tips, tricks and problem reports
Topic: DM42- clock losing time
Replies: 75
Views: 3917

Re: DM42- clock losing time

I certainly never bothered with CORRECT/SETAF/RCLAF on my HP-41CX, but those were also the days when I still used a mechanical wristwatch, so my standards of timepiece accuracy were not very high. Of course nowadays, I rely on my smartphone to tell time, and it synchronizes with time servers on the ...
by Thomas Okken
Fri May 10, 2019 2:55 pm
Forum: DM42
Topic: Thermal Paper?
Replies: 10
Views: 364

Re: Thermal Paper?

HP sold both blue and black print paper, and the black usually provides much clearer and better contrast results, but often you can't tell which type it is, as the seller typically doesn't know. When in doubt, you can always try asking the seller to check. All it takes is to tear off a small scrap ...
by Thomas Okken
Mon Apr 29, 2019 7:18 am
Forum: DM42
Topic: Feature requests
Replies: 33
Views: 2711

Re: Feature requests

Whether auto-repeat is a good feature or not is subjective, which is why Free42 lets you turn it off. N.B. There are actually two types of auto-repeat in Free42: (1) the one on the ▲ and ▼ keys, which lets you step through programs and multi-row menus by holding down the key in question, and (2) the...
by Thomas Okken
Wed Apr 24, 2019 4:08 pm
Forum: DM42
Topic: Feature requests
Replies: 33
Views: 2711

Re: Feature requests

Someone could write a patch for this, but it won't be me... viewtopic.php?f=15&t=409&p=4829#p4829
by Thomas Okken
Mon Apr 22, 2019 7:10 am
Forum: Software Library
Topic: Put, Get, Data Matrix
Replies: 2
Views: 301

Re: Put, Get, Data Matrix

NOTE: EXITing or EXITALL from the INDEX function does not clear IJ. When accessing any of the ← functions, values of the matrix appear. I noticed that Pica used EDIT and INDEXEd the matrix in one of his programs. Perhaps he is aware of this feature. To experience this, INDEX a matrix. EXIT then acc...