I ran a search for a credit card sized computer and found the “Raspberry Pi” . I do not know if it is powerful enough to do what I want yet but it’s a start. It is a full function desktop computer with 2 USB 2.0 , eathernet, hdmi , micro USB for power, boots from SD card, runs “Raspbian” which is a port of Debian Linux runs almost all of the Debian packages. Well enough of that ,you can look it up for yourself. It might be able to run a chat bot and there are digital interfaces available for it to run servos and things.smiley