Apex Digital Tracer, Reference Manual

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8.4 External IRQ Source 0 (IRQ_IN0) J5
J5
Jumper
Position Function
1-2 External Interrupt source 0 input at J12 pin 22 (J12.22)
2-3* J12 pin 22 grounded (for opto 22 rack compatibility). External Interrupt Source 0 not available.
* FACTORY CONFIGURATION
8.5 8255 Device #2 Registers
Detailed register information for 8255 device #2. Both bit names and associated connector placement are shown where
applicable (i.e. ref.pin#).
Base + 4 8255 Device #2 Port A Register Read/Write
D7 D6 D5 D4 D3 D2 D1 D0
2A7 2A6 2A5 2A4 2A3 2A2 2A1 2A0
Associated Connector Pins:
J9.1 J9.3 J9.5 J9.7 J9.9 J9.11 J9.13 J9.15
Base + 5 8255 Device #2 Port B Register Read/Write
D7 D6 D5 D4 D3 D2 D1 D0
2B7 2B6 2B5 2B4 2B3 2B2 2B1 2B0
Associated Connector Pins:
J9.33 J9.35 J9.37 J9.39 J9.41 J9.43 J9.45 J9.47
8.5 8255 Device #2 Registers Tracer Reference Manual
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