PCA-6781 User Manual 14
2.7 Main Power Connector (CN16)
Supplies main power (+5 V and +12 V) to PCA-6781, and it is a 7 pins power connec-
tor.
2.8 Printer port Connector (CN3)
Normally, the printer port is used to connect the card to a printer. The PCA-6781
includes a multi-mode (SPP/EPP/ECP) printer port accessed via CN4 and a 26-pin
flat-cable connector. You will need an adapter cable if you use a traditional DB-25
connector. The adapter cable has a 26-pin connector on one end, and a DB-25 con-
nector on the other.
The printer port is designated as LPT1, and can be disabled or changed to LPT2 or
LPT3 in the system BIOS setup.
The printer port interrupt channel is designated to be IRQ7.
You can select ECP/EPP DMA channel via BIOS setup.
2.9 CompactFlash Socket
The PCA-6781 provides a 50-pin socket for CompactFlash card type I/II.
2.9.1 CompactFlash (CN24)
The CompactFlash card occupies a secondary IDE channel which can be enabled/
disabled via the BIOS settings.
2.10 Floppy Connector (CN2)
You can attach one floppy drive to the PCA-6781. You can use any combination of
5.25” (360 KB and 1.2 MB) and/ or 3.5” (720 KB, 1.44 MB, and 2.88 MB) drives.
Important! Make sure that the ATX power supply can take at least a 10 mA load on
the 5 V standby lead (5 VSB). If not, you may have difficulty powering on
your system.
Note! If your power supply doesn’t have +12 V output (+5 V only), PCA-6781
needs to go T-part number to add the components for the 5 V to 12 V
converting circuit, but LVDS and PC104 also cannot be used within +5 V
only.
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