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Blocks
CREATE-FILE ( n --) FILENAME.EXT : creates a BLK file with n blocks
CAPACITY ( --) : return total number of screens
MORE ( n --): adds more blocks to current file
OPEN ( --) FILENAME.EXT : open file as input and output (closes previously opened file)
FROM ( --) FILENAME.EXT : open file as input
SWITCH ( --): exchange input and output files
BLOCK ( n -- addr ) : get block n into a buffer and returns it address (DO NOT STORE this address, it could be invalid after another BLOCK call)
FLUSH ( -- ): Save and clear all the buffers
UPDATE ( -- ): Mark the most recently used buffer as modified
DISCARD ( -- ): removes the updated mark from most recently used buffer
EMPTY-BUFFERS ( -- ): clear all the buffers
SAVE-BUFFERS ( -- )
OPEN dest.blk FROM source.blk 2 4 COPY : copy all data from source.blk SCR#2 to dest.blk SCR#4
OPEN dest.blk FROM source.blk 1 4 TO 6 CONVEY: copy SRC#1-SCR#4 to dest.blk SCR#6-SCR#9