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*
* ACIA Structure
*

* struct acia

 org 0

csr rmb 1 control - status
dbuf rmb 1 data buffer

* status codes

ACRBSY equ %00000001 receive busy
ACTBSY equ %00000010 transmit busy
DSBXIN equ %00000000 disable transmit int
ENBXIN equ %00100000 enable transmit int
ENBRIN equ %10000000 enable read interupt
AWORD equ %00010100 ACIA word setup
ADIVID equ %00000001 clock divide rate
