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collapseos/recipes/rc2014/blk/601

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ACIA driver
Manage I/O from an asynchronous communication interface adapter
(ACIA). provides "(emit)" to put c char on the ACIA as well as
an input buffer from which a provided "(key)" reads. This driver
installs an interrupt handler at RST38 to handle RX.
To use, begin by loading declarations (B582) before xcomp is
loaded. These declarations provide default values for ports and
memory offsets that you can override. See B582.
Then, in the driver part, load range 583-588.