Block transfer section items

BTn:e[.f][/b]

n represents the file number (NOT optional) and must be 3 - 999 decimal.

e specifies the element number (three words per element) within the Block Transfer file (0 - 999 decimal).

f identifies one of the valid Block Transfer fields. The valid fields for Block Transfer items are listed in the table. If .f is omitted, it is assumed to be the word containing the status bits.

b is optional and is normally not used. Specifying the .f fields can access all of the fields of a Block Transfer. However, it is possible to use /b to single out a bit in the .FILE or .ELEM fields (which are words). For Block Transfer files, the bit number must be 0 - 15 decimal.