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
LOAD+  n --      Relative load. Loads active block + n.
LOADR  n1 n2 --  Load block range between n1 and n2, inclusive.
LOADR+ n1 n2 --  Relative ranged load.
WIPE   --        Empties current block


