James Harris  wrote:
> On 09/07/2019 11:37, Derek.Moody wrote:
>> In article , James Harris
>>  wrote:
>>
>>
>>> Right Now, The Pi 4 must be treated like a very Early Pi.  Booting is
>>
>> Yes, very promising too.
>>
>>> limited to the (faster?) SD card and its video limited / Early days. The
>>> Pi 4 has vast IO and CPU upgrades, so that where performance gains live.
>>> First move swap off the SD card, and avoid demanding video jobs. The Pi 4
>>
>> I bought a £350 Intel machine this year purely for 3D rendering - first
>> tests suggest the new Pi will be, perhaps not better but certainly in the
>> same class although I'm waiting for 3rd party software to be recompiled to
>> be certain - I looked at the dependency lists and decided to leave it to
>> those who know what they're doing.
>>
>>> runs hot. Its CPU clock hard and fast, when pushed to 80 C. ZRam memory
>>> compression may help, squeezing more out of whatever memory your Pi has.
>>> the 4GB ram limit keeps the PI with 32 bit limits. The 8GB Pi4 would have
>>> pushed Raspbian out of pure 32 bit land. Perhaps later, after we  adjust
>>> to the new Power Pi. I shall buy a Pi4 this fall.  Bye bye Intel P4
>>
>>> If I went for a Pi 4 as desktop I would cover much of that with an SSD,
>>> UPS and temperature-controlled fan.
>>
>> Definitely: looking at the specs a safe shutdown rather than full ups could
>> be covered by a simple usb portable powerbank.
>
> I am not sure how a USB powerbank would tell the Pi to shut down.
>
> I have a Pico UPS on a Pi 2. It has what it calls FSSD - file-safe
> shutdown. Whether it is 'switched off' or the battery runs low it will
> invoke demons to shut the system down in an orderly way.
>
>

A small, non-backed-up 5v wall wart will provide a logic level that goes
low whenever mains power fails. Two resistors will convert it to a 3.3v
logic level.

--
-michael - NadaNet 3.1 and AppleCrate II:  http://michaeljmahon.com

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