Meilhaus Electronic ME-90 Series, Electronic Manual

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3.5.5 ME-90 PC/104-Plus
Picture 28 shows the position of jumpers soldering bridges and
connectors.
*ISA bus looped through for other PC/104 boards.
**Automatic level adaption to 3.3 V or 5 V PCI bus (Universal-PCI).
3.5.5.1 Multi-I/O Port
On the ME-90 PC/104-Plus the multi-I/O port of the EXAR
XR17D158 chip can be used for customer-specific extensions. The
20-pin IDC connector (ST3) provides VCC (+5 V), PC ground
(GND_PC), 8 multi-I/O pins (MIO_x) and the clock input TMRCK. All
the other pads are not connected (n.c.). The pinout of ST3 can be
found in appendix B6 on page 111. A detailed description of the
chip can be found in the datasheet of the manufacturer under
www.exar.com.
Attention: VCC at ST3 must not exceed 300 mA!