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The BACI state contains these registers:
Name
Size
Radix
Symbolic
Action
IBUF
16
8
Input buffer; holds line status
OBUF
16
8
Output buffer; hold channel select
STATUS
16
2
Card status word
EDSIW
16
8
Enable device status interrupt word
DSRW
16
8
Device status reference word
CFCW
16
8
Character frame control word
ICW
16
8
Interface control word
ISRW
16
8
Interrupt status reset word
FIFOPUT
8
10
FIFO load index
FIFOGET
8
10
FIFO unload index
FIFOCNTR
8
10
FIFO character counter
BRKCNTR
16
10
BREAK clock counter
FIFO [0:127]
8
8
FIFO buffer
SPCHAR [0:255]
1
2
Special character RAM
UARTTHR
16
8
UART transmitter holding register
UARTTR
16
8
UART transmitter register
UARTRHR
16
8
UART receiver holding register
UARTRR
16
8
UART receiver register
UARTCLK
16
10
UART transmitter/receiver clock counter
CTIME
19
10
Inter-character poll time
LKO
1
2
Interface interrupt lockout flip-flop
CTL
1
2
Interface control flip-flop
FLG
1
2
Interface flag flip-flop
FBF
1
2
Interface flag buffer flip-flop
SRQ
1
2
Interface DMA service request flip-flop
The FIFO register defaults to single-character format display and entry but may be overridden with a numeric-
format switch, if desired. The other symbolic registers default to octal display but may be displayed in single-
character format by specifying the
–A
switch. Symbolic entry for these registers is also supported
