[Coco] Battery-Backed RTCs for CoCo?

[RETRO Innovations]

On 11/30/2018 9:34 AM, Robert Gault wrote:
> Jim,
>
> Can't say much about relative cost of the RTCs 
Well, it's not cost per se, but compatibility.  The cheaper RTCs needs 
new drivers, as they are not compatible with the DS1315 and the DS1216
> but there is no reason to worry about IRQ problems. There is no need 
> to update the OS-9 time frequently. Just always use the clock_soft 
> module and run a separate program to read the RTC say every 10 minutes.
>
> I have my NitrOS-9 set this way and even though a 9 byte initialize 
> code must be sent to my RTC for each read, no significant time is lost.

Gene Heskett.  Care to weigh in?

For reference, here was the original concern:

On 11/10/2018 9:05 PM, Gene Heskett wrote:
> The one in the B&B is fairly good, but its security password has to be
> clocked into it a bit at a time from an $AA55 integer.  And it has to be
> done while all interrupts are disabled. And having the IRQ's locked out
> for so long absolutely trashes the bitbanger if its in use, and renders
> the deluxe rs232 pack workless above around 300 baud from frameing
> overruns. I worked on that clock module too, but it screwed up so many
> file transfers I bought the disto 4&1 & went scsi.