HP 8509A Programming Manual page 61

Display:Update{ ? | :<NumPoints> }
Drive?
Drive:<MS-DOS Drive Spec>
GetFile:<"filename">
NNNNNNNNNNNNNNNNNNNNNNNNNN
GetMarker:{ A | B | C }
Not Recommended
GetMarker?:{ A | B | C }
0 1
2 3 0 1 2 3
Remote Command Reference 8-19