In I/O mode the Pxx number columns refer to the corresponding bit position for the pin in the 32-bit I/O configuration registers.

In the 8-bit-data-bus-mode columns, the pin name describes the pin functionality as databus (D7-D0), address bus (A19-A0), or as one of the control bus signals.

In the 16-bit-data-bus-mode columns, the pin name describes the pin functionality as databus (D15-D0), as address bus, or as one of the control bus signals.

I/O mode and bus mode can be mixed. This is defined by the mode configuration register which should be initialized by the PC application during program start. When pins are used in the bus mode, the I/O register functionality is disabled.

Target interrupt input is supported in both I/O mode and bus mode.

The IOTESTER J3 connector can directly be connected to the RAMTEX FCC/FCB breakout board.. GUI hardware, such as LCD display modules and keyboards, often comes with FCC/FCB cables of different sizes. The board can be mounted with connectors for 0.5 mm, 0.8 mm, 1.0 mm, or 1.2 mm pitch FCC/FCB cables. The board also has a strapping area to adjust for different sequences in cable signals.
 

IOTester supports both 5V and 3.3V target systems. The power supply level is selected with a jumper on the J2 pins. Level shifters on the J3,J4 signals ensure that the correct logical high-low levels are used in accordance with the power supply selection. Both CMOS and TTL logic are supported. Built-in EMC,ESD protection on all target interface and power supply pins.
 

IOTester requires a 5V supply for the LPT interface logic, either from the 5V power supply adaptor connected to J1, or from the target system via J4 pin 26. Supply current 0.2 A.
Internal regulator for 3.3V. Can provide 5V or 3.3V power to a small target system (such as an LCD display).
IOTester power adaptor 100V-240V AC -> 5V 1A. Exchangeable power plugs: European standard, US, UK.
 

The IOTester hardware contains 5 internal registers which are accessible to the user, plus hardware logic for controlling an external data bus.
A PC application program uses the internal registers to configure and control the IOTESTER port interface (similar to the I/O port initialization procedure with embedded processors).
If the PC application program configures IOTESTER as 'I/O-only', then these registers are the only interface to the external world (similar to I/O ports in a single-chip processor).
If the PC application program configures IOTESTER for 'bus-mode', then the PC application program can, in addition to the internal registers, access any peripheral I/O hardware connected to the external "processor bus".

IOTester Register	Size		Symbolic name
Bus mode	8-bit		IOT_MODE_REG
I/O port direction	32-bit		IOT_IODIR_REG
Input port	32-bit		IOT_INPUT_REG
Output port set	32-bit		IOT_IOSET_REG
Output port clear	32-bit		IOT_IOCLT_REG

Read the IOTester software description for more details about how to use these registers.