Search found 192 matches

by ijabbott
Mon Jul 29, 2019 7:19 pm
Forum: Update Announcements
Topic: UPDATE: DMCP-3.15
Replies: 21
Views: 11683

Re: UPDATE: DMCP-3.15

So far so good! Two-key rollover response feels much improved compared to 3.14. But I have another small bug report: you forgot to give this minor firmware update version number 3.142. ;) Surely it should be 3.141, so the next minor update can append a 9? This reminds me of the version numbering of...
by ijabbott
Sun Jul 28, 2019 10:52 am
Forum: Software Library
Topic: RTC Calibration program
Replies: 32
Views: 17855

Re: RTC Calibration program

Also, when rounding to an integer, the program adds 0.5 and takes the integer part. That's okay for positive values, but is incorrect for negative values. (IP truncates towards zero, not towards negative infinity.) Is it well known that ENTER FP + IP correctly rounds to the nearest integer, even fo...
by ijabbott
Sun Jul 28, 2019 1:05 am
Forum: Hardware
Topic: Case for Voyager 'L' size
Replies: 21
Views: 11208

Re: Case for Voyager 'L' size

Hard cases for storing portable 2.5 inch hard drives / SSDs are quite good, such as these ones by Inateck: https://www.amazon.co.uk/dp/B00L35UID0 https://images-na.ssl-images-amazon.com/images/I/717ouMlSEhL._SL1000_.jpg (I'm sure very similar cases are available with different brands.) The main down...
by ijabbott
Sat Jul 27, 2019 4:47 pm
Forum: Software Library
Topic: RTC Calibration program
Replies: 32
Views: 17855

Re: RTC Calibration program

Also, when rounding to an integer, the program adds 0.5 and takes the integer part. That's okay for positive values, but is incorrect for negative values. (IP truncates towards zero, not towards negative infinity.)
by ijabbott
Sat Jul 27, 2019 2:50 pm
Forum: Software Library
Topic: RTC Calibration program
Replies: 32
Views: 17855

Re: RTC Calibration program

I think the rtccalib.cfg value shown by the program possibly needs to be negated, or possibly the drift needs to be negated. I'm not sure which! On 2019-03-31 (beginning of EU summer time), I set the calculator to the correct time. On 2019-07-17 (108 days later), I noted my calculator had gained abo...
by ijabbott
Tue Jul 23, 2019 9:28 am
Forum: Software Library
Topic: ? DM42 as Alarm Clock ?
Replies: 14
Views: 7961

Re: ? DM42 as Alarm Clock ?

It's probably technically feasible on the DM42 from a hardware point of view (using the STM32's RTC alarm capabilities), but probably a lot of effort from a software point of view.
by ijabbott
Sun Jul 21, 2019 1:14 pm
Forum: Discuss!
Topic: 43S News
Replies: 1000
Views: 266031

Re: 43S News

More WP43S emulator testing: On the current emulator version, 1. Complex entry comment: [RESET] 5 [CC] 1 [ENTER] does work and produces 5+i*1 [RESET] 5 [ENTER] 1 [CC] does not work. I would have expected the [CC] to take the X register while in entry mode. This would be convenient. [RESET] 5 [ENTER...
by ijabbott
Sat Jul 06, 2019 11:21 am
Forum: Usage tips, tricks and problem reports
Topic: Encoder/decoder
Replies: 24
Views: 10450

Re: Encoder/decoder

The encoder/decoder isn’t accepting my text files for encoding - only *.raw files for decoding. It doesn't support uploading program listings in text files, so you have to select and copy the text (e.g. from a text editor) and paste it into the "DM42 Listing" text box of the decoder/encod...
by ijabbott
Fri Jul 05, 2019 1:32 am
Forum: Usage tips, tricks and problem reports
Topic: Solver and Integrator: Program questions
Replies: 10
Views: 6417

Re: Solver and Integrator: Program questions

With something like a solver, the algorithm is everything. Whether you code it in assembly language, SysRPL, or C, is just an implementation detail. I bet the HP Solve algorithm has evolved since the 34C. It would be interesting to see the commented source code for the various implementations over ...
by ijabbott
Wed Jul 03, 2019 10:31 pm
Forum: Usage tips, tricks and problem reports
Topic: Solver and Integrator: Program questions
Replies: 10
Views: 6417

Re: Solver and Integrator: Program questions

The solver and integrator are probably implemented in some pre-HP48 version of System RPL (SysRPL), or possibly Saturn assembly language for speed. ... I assume the basic procedures are older since they were implemented on HP-34C and -15C before the rise of RPL already. I don't think HP did redesig...