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- 0x80 CONSTANT ACIA_CTL ( IO port for ACIA's control register )
- 0x81 CONSTANT ACIA_IO ( IO port for ACIA's data registers )
- 0x20 CONSTANT ACIA_BUFSZ ( SZ-1 must be a mask )
- ( Address in memory that can be used variables shared
- with ACIA's native words. 4 bytes used. )
- CREATE ACIA_MEM SYSVARS 0x70 + ,
- ( Points to ACIA buf )
- : ACIA( ACIA_MEM @ 2+ ;
- ( Read buf idx Pre-inc )
- : ACIAR> ACIA_MEM @ ;
- ( Write buf idx Post-inc )
- : ACIAW> ACIA_MEM @ 1+ ;
- ( This means that if W> == R>, buffer is full.
- If R>+1 == W>, buffer is empty. )
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