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'Pic interface to Internal modem.'
1997\08\20@222647 by Dooley, Tom

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Has anyone worked on an interface to an internal modem using a pic?

would it be possible to interface to the data bus(from the uart) and decode
the address lines and use the irq for the interrupt?

Of course this would be done with the older 2400/9600/14.4 internal modems
and not the winmodems or the RPI modems that require Software running on
the system to work.

Any thought or ideas would be appreciated
Thanks
Tom

1997\08\20@234439 by John Payson

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> Has anyone worked on an interface to an internal modem using a pic?
>
> would it be possible to interface to the data bus(from the uart) and decode
> the address lines and use the irq for the interrupt?

I suppose it would be possible, but unless you add external latching,
you'll use up 15 I/O lines (8 data, 4 address, /IORD, /IOWT, and IRQ).  An
alternative might be to find a modem with a non-integrated UART chip.
Remove that, wire your PIC in its place, and you should be all set to go.

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