IEI Integration NOVA-PV-D4251_D5251 v1.01 - Manual (Page 40)

NOVA-PV-D5251/D4251 5.25" SBC
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Figure 3-6: SO-DIMM Connector Location
3.2.5 Digital I/O Connector
CN Label: DIO1
CN Type: 26-pin header (2x13)
CN Location: See Figure 3-7
CN Pinouts: See Table 3-6
The digital I/O connector provides programmable input and output for external devices.
The digital I/O provides 12-bit output and 12-bit input.