Chris McSweeny wrote :

> as I can just bo a bcf followed by a movlw, movf TRIS
 > to switch the pin which is OC

Or simply do :

bcf gpio, the-pin
bcf trisio, the-pin

Note that there is *no* RMW issue with the TRIS register !

 > (and investigation shows the pull-up is only to ~0.2V anyway!)

Hm, is there anything else pulling the "line" low ?
Normaly the pullup should keep the line "idle"
at close to the supply voltage (5 V or whatever).

Jan-Erik.

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