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Value
M i
1
0
2
1
4
2
Bit 0 is the least significant bit.
All interrupt mask bits are disarmed when the computer
is powered up or reset.
Value
00H
01H
02H
03H
04H
05H
06H
07 H
North Star HSIO-4
INTERRUPT MASK BIT ALLOCATION
Function
Signal
Tx Empty
Transmitter has finished
sending characters
Tx Ready
Buffer is ready to receive
the next character
Rx Ready
Receiver has a character to
be read by the computer
Table 3-9
EIGHT POSSIBLE BIT PATTERNS
Rx Ready
SX R.ea.dy
0
0
0
0
1
1
1
1
52
Table 3-8
1 = Arm
0 = Disarm
Tx,.Empty.
0
0
0
l
l
0
l
l
0
0
0
l
1
0
1
l
User/Technical Manual
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