Search found 475 matches

by Thomas Okken
Thu Jul 02, 2020 9:45 pm
Forum: Software Library
Topic: Flags status DM42
Replies: 20
Views: 764

Re: Flags status DM42

Thomas, do you know why these explanations don't show up DM42HELP.HTM? The DM42HELP.HTM file is maintained by SwissMicros, not by me. I assume they just didn't think to update it to reflect these flag changes, most of which are fairly recent. 2017-03-11: release 1.5.14 -- flag 31 2019-04-07: releas...
by Thomas Okken
Thu Jul 02, 2020 3:12 am
Forum: Software Library
Topic: Flags status DM42
Replies: 20
Views: 764

Re: Flags status DM42

At the same time I attached a reference OFFIMAGE of the flags. The DM42 (and Free42) uses a few flags that are unused on the real HP-42S: Flags 31 & 67: date format mode: 67 clear, 31 clear: MDY mode (default) 67 clear, 31 set: DMY mode 67 set: YMD mode Flag 64: shift This flag indicates whether or...
by Thomas Okken
Sat Jun 27, 2020 6:31 pm
Forum: Discuss!
Topic: Torr and mmHg ??
Replies: 30
Views: 809

Re: Torr and mmHg ??

Sure, back in the days before everything was built out of standard-sized parts.

But hey, if you really want to believe in a narrative, you'll do it no matter what, so never mind...
by Thomas Okken
Sat Jun 27, 2020 2:30 pm
Forum: Discuss!
Topic: Torr and mmHg ??
Replies: 30
Views: 809

Re: Torr and mmHg ??

I don't think Italy is full of millions of houses that were built out of lumber cut to Roman-era units.

C'mon.
by Thomas Okken
Sat Jun 27, 2020 7:27 am
Forum: Discuss!
Topic: Torr and mmHg ??
Replies: 30
Views: 809

Re: Torr and mmHg ??

According to this, he was interested in doing so, but it must not have been a very high priority:

https://www.npr.org/sections/thetwo-way ... ric-system
by Thomas Okken
Fri Jun 26, 2020 11:18 pm
Forum: Discuss!
Topic: Torr and mmHg ??
Replies: 30
Views: 809

Re: Torr and mmHg ??

In fairness to the United States, it should be recognized that it is a lot easier to adopt a standard where there wasn't one before, than it is to replace an existing standard with a new one. The Imperial Units were well-established long before the metric system was introduced, and switching to metr...
by Thomas Okken
Wed Jun 24, 2020 7:41 pm
Forum: Usage tips, tricks and problem reports
Topic: STO - RCL Size Error
Replies: 5
Views: 207

Re: STO - RCL Size Error

You can also use the SIZE function in the MODES menu; it will set the size of REGS to the desired number, and create REGS if it doesn't already exist. To set SIZE 25, type

[Shift] [+/-] [▼] [Σ+] [2] [5] [ENTER]
by Thomas Okken
Wed Jun 17, 2020 12:55 pm
Forum: DM42
Topic: DM42 and accuracy
Replies: 24
Views: 1259

Re: DM42 and accuracy

When in rad mode and asking for sin(pi) i have -1.158E-34. Is this because the constant for pi is limited to certain number of digits? Yes. sin(x-pi) = -sin(x), and when x approaches zero, sin(x) = x, so sin(x-pi) = -x. In bid128 (the 34-digit floating-point format used by Free42 Decimal and the DM...
by Thomas Okken
Tue Jun 16, 2020 7:32 pm
Forum: DM42
Topic: DM42 and accuracy
Replies: 24
Views: 1259

Re: DM42 and accuracy

To provide only one starting value and ignore any previous values, enter the new starting value twice: 100 [X] 100 [X] [X]. I keep forgetting how the menu decides whether pressing [X] means STO "X" or SOLVE "X". You might think this is done using the number entry flag, but that is not the case. Rat...
by Thomas Okken
Mon Jun 15, 2020 8:32 pm
Forum: DM42
Topic: DM42 and accuracy
Replies: 24
Views: 1259

Re: DM42 and accuracy

There's nothing in SOLVE to keep it trying only integers if the initial guesses are integers. But it sounds like what you're observing has a different reason. SOLVE actually uses two starting values, not one. If you provide only one, the other one will be whatever was left from the last time it ran,...