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In Block I/O Words in TurboForth Kernal
Loads block block from the file currently in USE into a free buffer.
USE
none
Returns the address vdp_addr representing the beginning of the buffer in VDP memory.
BLOCK returns 0 if the block could not be loaded. In that case, IOERR can be checked for a possible I/O error.
BLOCK
IOERR
Blocks (and their associated buffers) are exactly 1024 bytes in length.
Calls FLUSH if no free buffers are available.
FLUSH