Disk

BLK>  -- a      Address of the current block variable.
BLK(  -- a      Beginning addr of blk buf.
BLK)  -- a      Ending addr of blk buf.
COPY  s d --    Copy contents of s block to d block.
FLUSH --        Write current block to disk if dirty.
LIST  n --      Prints the contents of the block n on screen
                in the form of 16 lines of 64 columns.
LOAD  n --      Interprets Forth code from block n
LOADR n1 n2 --  Load block range between n1 and n2, inclusive.
WIPE  --        Empties current block