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collapseos/arch/z80/rc2014/blk/605

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2020-08-16 23:31:02 +10:00
: ACIA$
H@ [ ACIA( LITN ] ! 0 [ ACIAR> LITN ] C!
1 [ ACIAW> LITN ] C! ( write index starts one pos later )
[ ACIA_BUFSZ LITN ] ALLOT
( setup ACIA
CR7 (1) - Receive Interrupt enabled
CR6:5 (00) - RTS low, transmit interrupt disabled.
CR4:2 (101) - 8 bits + 1 stop bit
CR1:0 (10) - Counter divide: 64 )
0b10010110 [ ACIA_CTL LITN ] PC!
(im1) ;