Adding a Second SD Card
The BV513 and firmware are already set up to accept a second SD Card and so adding one is a matter of the addition of new hardware.
JP8 contains all of the necessary signals for a second card.
The card is connected to the same interface as the Micro SD Card on board, the difference is the chip select (RE0) and card detect (RE1) lines. Both of these are used in the firmware (Micro-BOS). The write protect (RE2) is not used by the firmware but the user can utilise RE2 for this if required. RC1 is also activated when card access takes place, this is shared with the on board SD Card.
Any SD card can be added but the simplest way is to us the BV410 as this is pin for pin compatible with JP8. The BV410 can be used with a non-SPI interface and so not all of the connections are needed, these must not be connected to JP8.
Use a straight pinhead connector and remove the two pins that correspond to DA1 and DA2, these are marked on the other side of the BV410. The card then simply plugs into the BV513:
This method partially obscures the other half of JP8 and so a small piece of ribbon cable could be used to mount the new SD holder some distance form the main board.