Search found 82 matches

by HPMike
Tue Dec 26, 2017 3:55 pm
Forum: DM42
Topic: Headline: DM 42 hits road at...
Replies: 14
Views: 2823

Re: Headline: DM 42 hits road at...

This sounds like the HP 35 advertisement that bragged that it had survived accidental ingestion and ejection by a snow blower. Anyways,it is nice to know that the DM42 has the ruggedness of a Rolex.
by HPMike
Fri Dec 22, 2017 9:16 pm
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

As a followup to the reason for my initial post, I have finally had the opportunity to run a computation that takes about ten seconds to execute on my old HP-42S, and on the DM42 just being powered by the internal battery at 24 MHz it takes less than a second. So, this calculator is freaking fast wh...
by HPMike
Thu Dec 21, 2017 4:29 pm
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

grsbanks wrote:
Thu Dec 21, 2017 3:56 pm
The battery "icon" in the top-right becomes a USB logo.
I just confirmed this using the USB cable and charger for my HP Prime. I can can also confirm that my DM42 did not explode. :D
by HPMike
Thu Dec 21, 2017 3:50 pm
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

Does the DM42 have an annunciator to indicate connection to a USB power supply ?
by HPMike
Thu Dec 21, 2017 4:56 am
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

Yes, it is printed on the chargers and yes, I do know what open circuit voltage means. FWIW, I just measured the output from the iPhone charger and it is 5.09 vdc.
by HPMike
Thu Dec 21, 2017 4:40 am
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

The output from my iPhone charger is 5 vdc 1 A, which is the same as the USB charger for my HP Prime. However, those chargers are meant to recharge the batteries inside the devices as well as power them, whereas it will only power the DM42, so I’m not sure that matters. I’m also not an electrical/el...
by HPMike
Thu Dec 21, 2017 2:33 am
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Re: Powering the calculator from the USB port

My PC is turned off most of the time and I mostly use my iPad for web surfing and whatnot. In fact, I’m writing this reply on my iPad right now and my PC is far away from where I’m sitting. As to speed, I do have some calculation intensive programs that can run for hours on a slower machine.
by HPMike
Thu Dec 21, 2017 1:15 am
Forum: Usage tips, tricks and problem reports
Topic: Powering the calculator from the USB port
Replies: 31
Views: 5599

Powering the calculator from the USB port

I understand that if I connect the DM42 to my PC via the USB port that it will get power from the USB connection and will automatically switch to a higher clock speed. So, can I safely connect the cable to my iPhone charger, or will this damage my calculator ?
by HPMike
Wed Dec 20, 2017 3:54 pm
Forum: Hardware issues
Topic: Where is the PRGM hole ?
Replies: 8
Views: 2066

Re: Where is the PRGM hole ?

Great ! Sounds like firmware updates on the DM42 are a lot easier and more reliable than on the DM15L.
by HPMike
Wed Dec 20, 2017 3:17 pm
Forum: Hardware issues
Topic: Where is the PRGM hole ?
Replies: 8
Views: 2066

Re: Where is the PRGM hole ?

Thanks ! So do you just press RESET only when doing a firmware update ?