The data manual for the tms7xxx series mentions no ROM reading magic. For the TMS7040 inside the CoCo's S/SC Frank Palazzolo removed the chip from the board and created a rig to trojan the ROM from the microcontroller.

I detailed it here http://groups.google.com/group/bit.listserv.coco/msg/091b018c65b82e8d


tim lindner
tlindner@macmess.org