ecca70c7f3
This would allow things like temporary giving control to the *CL line on the TRS-80. For example... A very far fetched example. Not at all the only *raison d'etre* of the layer...
17 lines
377 B
Plaintext
17 lines
377 B
Plaintext
: KEY
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( inc then fetch )
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ACIAR> @ 1+ DUP ACIA) @ = IF
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DROP ACIA( @
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THEN
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( As long as R> == W>-1, it means that buffer is empty )
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BEGIN DUP ACIAW> @ = NOT UNTIL
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ACIAR> !
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ACIAR> @ C@
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;
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: (emit)
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( As long at CTL bit 1 is low, we are transmitting. wait )
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BEGIN ACIA_CTL PC@ 0x02 AND UNTIL
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( The way is clear, go! )
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ACIA_IO PC!
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;
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