Brother PC-850D Operation Manual page 177

This message is displayed when trying to retrieve a pattern from
a memory card and that memory card is not inserted.
This message is displayed when the "CARD" key is touched
while a memory card that cannot be read by this machine is
inserted.
This message is displayed when you have tried to retrieve a
pattern from one memory card while a different memory card
was inserted into the slot.
This message is displayed when you have tried to combine
more than 71 patterns.
This message is displayed when the "EMBROIDERY" key or
"BASIC SEWING" key is pressed when in utility stitch mode.
This "REVERSE STITCH" button is pressed in embroidery
mode.
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