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3.4
INTERRUPTS
Signal
Tx Empty
Tx Ready
Rx Ready
Sync Detect
North Star HSIO-4
Each HSIO-4 port provides four sources of
interrupt from the following signals:
Function
Transmitter has finished sending characters
Transmitter is ready for next character
Receiver has a character ready for computer
Synchronization has been achieved
(in synchronous mode only)
The first three interrupt sources are armed
and disarmed under program control; the fourth
interrupt source, Synchronous Detect, is armed
by a mini-jump on the HSIO-4 board. The
resultant interrupt from each port can be
connected to any of the S-100 interrupt lines.
As supplied, the interrupts for all HSIO-4
ports are connected to S-100 bus interrupt
line VI2.
50
Table 3-7
INTERRUPT SIGNALS
User/Technical Manual
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