collapseos/blk/581
Virgil Dupras 9424770caa rc2014: add a declaration part to ACIA drivers
Driver configuration don't need their own words at runtime, we only
need to compile them as literals when compiling words.

Now that we have this "declaration blocks" pattern emerging, it
seems like a good idea to take advantage of this in drivers, both
for simplifying the xcomp unit and to make final binary slimmer.
2020-06-28 17:30:01 -04:00

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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.