Simon Says:
In a message dated 6/23/99 4:07:29 PM Pacific Daylight Time,
spredwood@sri-net.demon.co.uk writes:

> Pleeease HELP !
>
>  I am unable to read the information in an 24C02 eeprom, I can successfully
>  write to any address, but all reads return a 'FF', irrelevant of the
>  information held in them, which I know to be valid data.
>
>  How can I set the port up to read instead of write on the data lines esp.
>  DATA_0(pin 2)


Hi Simon,

Is this interface to a PIC or parallel port?  If it's to a parallel port, and
you want to use the DATA lines as input, make sure your port is set to EPP or
ECP.  Then, you'll need to set bit 5 of the control port, in pseudo code,
it'd be something like this:

Out to Control Port = Control Port (37A on some puters) OR  &H20

This will set all 8 data lines to input.

As far as the I2C read routines, can't help ya there, I've never implemented
I2C on the parallel port -- I got too darn frustrated with it and put it on
hold.


Hope this helps,

Tim H.