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collapseos/blk/582
Virgil Dupras 3068b58be5 Rename RAMSTART to SYSVARS
It's more descriptive this way. Also, I'll soon add a new HERESTART
config.
2020-06-28 18:49:30 -04:00

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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 )
( Address in memory that can be used variables shared
with ACIA's native words. 8 bytes used. )
CREATE ACIA_MEM SYSVARS 0x70 + ,
( Points to ACIA buf )
: ACIA( ACIA_MEM @ 4 + ;
( Points to ACIA buf end )
: ACIA) ACIA_MEM @ 6 + ;
( Read buf pointer. Pre-inc )
: ACIAR> ACIA_MEM @ ;
( Write buf pointer. Post-inc )
: ACIAW> ACIA_MEM @ 2+ ;
( This means that if W> == R>, buffer is full.
If R>+1 == W>, buffer is empty. )