[A83] Re: Will someone create a clock for the TI-83 Plus?
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[A83] Re: Will someone create a clock for the TI-83 Plus?
On Sat, 06 Sep 2003 19:23:41 +0200
Olof Hedman <alh@home.se> wrote:
> Max Sikstrom wrote:
>
> >>>It would be cool if we can get use of the backup battery to
> >>>create a clock for the TI-83 Plus
> >>>
> >>>
> >> I don't think that's possible. The battery gives a direct
> >> current, and to have a clock you need a pulse of some kind.
> >> I don't think AC is useable either.
> >>
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> >
> >It's possible... You just have to use a crystal and a frequency
> >divider, a binary conter and a parallel-to-serial converter, or
> >something like that... But I think it easier to buy a realtime clock
> >IC, and build a interface to the link-port...
> >
> >
>
> Heh.. yeah. The whole idea of pluggin your (portable) calc into the
> wall just to be able to have a clock seems quite stupid :)
> specially since it would stop working when you unplug it.
> Realtime IC.s are cheap and easy to interface. The Dallas DS 1302 has
> serial interface and costs about $5 for example (the first I could
> find, there are probably even cheaper, the price is from elfa.se who
> are quite expensive)
> Its surface mounted and only 8 pins. really small.
>
> --Olle
>
>
>
Well I think it's not so hard to use it to a calc if you buy a chip with
I2C... I think you just have to connect it to a battery and direct to
the link-port... and then code a I2C-interface in Z80-asm...
--
Max Sikstrom
pengi@molik.org
MoLiK programming and demo group
http://www.molik.org/
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