collapseos/blk/008
2020-05-03 19:24:41 -04:00

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Interpreter I/O
The INTERPRET loop, the heart of Collapse OS, feeds itself
from the C< word, which yields a character every time it is
called. If no character is available to interpret, it blocks.
During normal operations, C< is simply a buffered layer over
KEY, which has the same behavior (but unbuffered). Before
yielding any character, the C< routine fetches a whole line
from KEY, puts it in a buffer, then yields the buffered line,
one character at once.
Both C< and KEY can be overridden by setting an alternate
routine at the proper RAM offset (see B80). For example, C<
overrides are used during LOAD so that input comes from
disk blocks instead of keyboard. (cont.)