Chapter 3: Option Selection
Refer to the setup programs on the CD or diskettes provided with the card. Also, refer to the block diagram on
the previous page and the option selection map on the following page when reading this section of the manual.
External Interrupts are accepted on the I/O connector pin 9 (bit C3 group 0) and pin 59 (bit C3 group 1). The
Interrupt signal is a positive edge. External Interrupts are enabled if the IEN0 (for Group 0) and IEN1 (for Group
1) jumper is installed. Interrupts are directed to an available IRQ level by the system.
A means of enabling or disabling the 74LS245 input/output buffers under program control is provided at the
jumper position labeled TST/BEN. When the jumper is in the BEN (Buffer Enable) position, the I/O buffers are
always enabled. When the jumper is in the TST (Tristate) position, enabled/disabled state is controlled by a
control register. (See the programming section of this manual for a description.)
Note: A jumper must be installed in either the TST or the BEN position for the card to function.
The foregoing are the only manual setups necessary to use either model 48H or model 48HS. Input/Output
selection and the change-of-state Interrupt Enable is done via software by writing to a control register in each
PPI as described in the PROGRAMMING section of this manual.
Figure 3-1: Option Selection Map
Manual PCI-DIO-48 H/HS
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