Interfacing serial RTC chip with serial port

[Stedy]

Hi,

Yes, connecting DI, DO, CLK and ground to the parallel would be all you need to do. Power the chip from a 5V power supply, using perhaps a connection from your Amiga's power supply or a micropower regulator and a battery pack to retain the time when the power is off!

Another option but more involved would be to use a micrcontroller to interface to the chip and send the time to your Amiga via the serial port. This would have a lower CPU overhead.

[motorollin]

Great, thanks for the info!

--
moto

[alexh]

I don't always want to connect to the Internet because it causes problems with WHDLoad

The X-Surf is not a card which creates the spurious interrupts that are supposed to interfere with WHDload. Put it this way I've used my A4000 with X-Surf card constantly connected to my network using Miami for over 8 years with no issues.

[keropi]

also the ariadne 1 network card does not mess with whdload... numerous times I had genesis online and played whd games....

[patrik]

It works fine as long as you dont receive any traffic (no interrupts are generated). Try pinging the amiga whilst playing.


/Patrik

[Doobrey]

motorollin wrote:
@Others who have suggested NNTP or soldering battery...
I've already explained why I don't want to do those.

What about using a pair of probe clips to hook onto the +5v and GND pins of the RTC chip to attach the new battery? (IIRC, it needs a resistor to limit the charging current between the battery and the +5v, the A4000 schematics should show the value needed )

If you're still thinking of using an i2c RTC chip, have a look at i2clib (aminet), it has simple interfaces for parallel,serial and floppy ports, and the shared library takes care of all the bit banging.