I can tell you that when I used to call BBSs at 300 baud with my Model 100, the AA batteries seemed to drain quickly.
On 9 December 2015 at 05:08, Josh Malone <josh.mal...@gmail.com> wrote: > I noticed no change in the power draw on my 102 when using the serial port, > although it wasn't actually connected to another device. > > On Dec 9, 2015 1:06 AM, "John Whitton" <jwhit...@bellsouth.net> wrote: >> >> Mike, >> >> M102, and it was running its own monitoring program, that's how it (I) >> knew run time. When it pooped out, the last time was recorded. It was, in >> fact , monitoring its own battery voltage via an ADIOS. One might argue that >> the RS-232 ate some power, but it was only OPENed when making a measurement >> at 5 minute intervals, then closed. >> >> If you recall, I also (later) embedded an A/D in a M102, which can >> measure both external voltages as well as monitor battery voltage. I could >> run the same test now, without having to hook anything up at all. Cheesy >> video of that: https://www.youtube.com/watch?v=HMV2HKwrCCc >> >> John W. >> >> ----- Original Message ----- >> From: Mike Stein >> To: Model 100 Discussion >> Sent: Wednesday, December 09, 2015 12:50 AM >> Subject: Re: [M100] M100 power requirements >> >> Was this an M100 or a 102, and what if anything was it running? >> >> Looks like an app for the ADIOS ;-) >> >> m >> >> ----- Original Message ----- >> From: John Whitton >> To: Model 100 Discussion >> Sent: Tuesday, December 08, 2015 11:04 PM >> Subject: Re: [M100] M100 power requirements >> >> *?* >> >> Hmm. I do not recall, but I'm betting that the supply was tied to the >> battery terminals, otherwise I would have had to make up a pigtail to use >> the jack. I wouldn't bet my life on that... >> >> As an aside, I attach here a plot of battery voltage vs. time. This >> was recorded using fully charged 2400mA NiMH batteries. Cutoff occured at >> 1407 minutes. Note the abrupt knee at the end of the useful battery >> charge/energy. That is characteristic of NiMH batteries. Alkalines have a >> more gradual slope >> >> John W. >> >> >> >> ----- Original Message ----- >> From: Josh Malone >> To: Model 100 Discussion >> Sent: Tuesday, December 08, 2015 6:14 PM >> Subject: Re: [M100] M100 power requirements >> >> Awesome, thank you. Any idea if this was measured with supply connected to >> the dc jack or the battery terminals? >> >> On Dec 8, 2015 5:53 PM, "John Whitton" <jwhit...@bellsouth.net> wrote: >>> >>> FWIW, find attached a .pdf graph of M102 power consumption. This was >>> compiled 6 years ago (hard to believe). >>> >>> John W. >>> >>> ----- Original Message ----- >>> From: Josh Malone >>> To: Model 100 Discussion >>> Sent: Tuesday, December 08, 2015 4:02 PM >>> Subject: Re: [M100] USB "juice pack" >>> >>> I just tested the power requirements of my 102. With the battery >>> connectors connected to a bench supply at 5 volts, it draws a very >>> consistent 65mA. I was expecting the current to vary slightly with CPU or >>> screen activity but it does not. I'm so used to CPU idle states which, of >>> course, the 8085 does not use :) >>> >>> I have one of these kicking around at home >>> (https://www.sparkfun.com/products/10968) so I'm thinking to construct a >>> LiPo-based AA battery replacement so I can recharge my 102 via USB. There's >>> also https://www.sparkfun.com/products/11231 but that's capable of WAY more >>> current than necessary and considerably more expensive. >>> >>> -Josh >>> >>> On Thu, Dec 3, 2015 at 7:00 PM, Mike Stein <mhs.st...@gmail.com> wrote: >>>> >>>> >>>> Yeah, I was wondering about that, especially with WiFi; definitely >>>> sounds a little high. Too bad. >>>> >>>> Maybe Jeff's solution isn't such a bad idea after all ;-) >>>> >>>> Anyway, the M100 works fine on a "juice pack". >>>> >>>> m >>>>
