OESF Portables Forum

Everything Else => Sharp Zaurus => Model Specific Forums => Distros, Development, and Model Specific Forums => Archived Forums => Cxx0 Hardware => Topic started by: richie on July 20, 2005, 02:37:11 pm

Title: Backup Battery Or Capacitor
Post by: richie on July 20, 2005, 02:37:11 pm

Hi

Does anyone know how the Cx00 series holds the date and time between shutdown's or battery changes? I know the SL5500 used a ni-cad with limited charge/discharges cycles, 100 cycles only if I remember rightly and I'm interested to know if the Cx00 relies on a ni-cad or super cap.

thanks
Rich

Title: Backup Battery Or Capacitor
Post by: craigtyson on July 20, 2005, 04:30:55 pm

They dont have anything other than the main battery + flash memory.  While its possable to shutdown a 5500, swap the battery and power on without rebooting or losing any open files, with the C series this is not possable.

Title: Backup Battery Or Capacitor
Post by: richie on July 21, 2005, 04:01:28 am

Quote

They dont have anything other than the main battery + flash memory.  While its possable to shutdown a 5500, swap the battery and power on without rebooting or losing any open files, with the C series this is not possable.
[div align=\"right\"][a href=\"index.php?act=findpost&pid=88962\"][{POST_SNAPBACK}][/a][/div]

There is nothing to even hold the time and date?

cheers
Rich

Title: Backup Battery Or Capacitor
Post by: mikew on July 21, 2005, 04:24:17 am

It appears to remember the date/time that you pulled the battery, looks as if it adds a couple of minutes to this & offers this as the default as part of the boot up process.

Mike

Title: Backup Battery Or Capacitor
Post by: Bundabrg on July 26, 2005, 01:13:53 am

Quote

Quote

They dont have anything other than the main battery + flash memory.  While its possable to shutdown a 5500, swap the battery and power on without rebooting or losing any open files, with the C series this is not possable.
[div align=\"right\"][a href=\"index.php?act=findpost&pid=88962\"][{POST_SNAPBACK}][/a][/div]

There is nothing to even hold the time and date?

cheers
Rich
[div align=\"right\"][a href=\"index.php?act=findpost&pid=89007\"][{POST_SNAPBACK}][/a][/div]

Somehow it holds the time somewhere. It does this through the use of 'sltime'. You call 'sltime-set' to set the time, and 'sltime' to retrieve the time.
I've got it set to call 'sltime -set' on suspend, shutdown, and 'sltime' in one of the startup scripts. As my Z hardly crashes, and when it doesn I quickly restart, I don't tend to lose time.

Still, it would be nice if it had a hardware RTC.

 - Bundabrg