DATAMATH PICTURES

This TI-57 manufactured in August 1977 makes use of a BP6 Battery Pack with just to NiCd Cells inside the case.	This TI-57 manufactured in October 1977 makes use of a BP7 Battery Pack with two NiCd Cells and a step-up converter inside the case.
The printed circuit board (PCB) of the orginal TI-57 consequently uses a piggy-back PCB with a step-up DC/DC converter.	The printed circuit board (PCB) of the revised TI-57 omits the additional piggy-back PCB for the DC/DC step-up converter.
The component side of the PCB of the original TI-57 with the solder connections to the piggy-pack step-up DC/DC converter.	The component side of the PCB of the revised TI-57 with the unused solder connections from the step-up DC/DC converter.