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650 System Manual (Draft)
Version 0.4 August 20, 2008
15
Compact Flash
The 650 has one Type I/II Compact Flash (CF) memory slot. This slot is only for IDE
mode CF devices and is easily accessed on the left side of the unit. The CF card is
mapped to a SATA port and supports PIO Mode 0-4. The CF card is normally used for
thin client configurations using XPe, CE, WEPOS, or Linux operating systems.
Compact Flash access panel
Touch Screen
The 650RT uses a five-wire touch screen rated at 35 million touches per point. The
650RT touch screen was designed to easily be changed, normally in less than ten
minutes. The resistive technology is very responsive and is not affected by liquids, dirt,
or other foreign matter, unlike IR or SAW touch screens. As with all J2 designed
products using resistive touch screens, the 650 includes a water tight gasket for spill
resistance.
The 650ST unit uses a Surface Acoustic Wave (SAW) technology touch screen. The
SAW touch screen has no known failure mode-- it does not “wear out.” This screen is
tempered glass and does not reduce the brightness of the LCD panel. When operating in
a very high use environment, SAW is the recommended touch screen technology.
Depending on operating environment and usage, both the Resistive and SAW touch
screens have strengths and weaknesses. J2 offers both touch screen technologies on the
650.