Technical Information 1-13PARALLEL INTERFACEThe system's parallel interface integrates National’s PC87332VLJ chip. It uses a 25-pin D-subconnector that is Enhanced Capabilities Port (ECP) equipped. The port is located on thesystem's rear panel.The user selects between three parallel interface modes using Auto Setup. These includeunidirectional, bidirectional or enhanced. Unidirectional mode sends data output from thestandard ISA port only. Bidirectional mode sends data using the standard ISA port or PS/2technology. Enhanced mode enables high speed data transmission to occur using either theunidirectional or bidirectional modes.The parallel port address is 378h and the interrupt level is IRQ07. Pin locations for the par-allel interface are listed in Appendix A.SERIAL INTERFACEThe RS-232C serial port is a 9-pin connector on the system’s rear panel. The serial portconsists of a 16550 compatible serial port controller with a programmable baud rate within50/56000 bps. The serial port connects an RS-232C device or an external modem. The se-rial port address is 3F8h and the interrupt level is IRQ04.VERSA P SERIES CHIP SETRefer to Table Section 1-6 for a quick summary of the chip types used in the system. Seethe Abbreviations section at the beginning of this manual for a translation of chip technolo-gies.Table Section 1-6 Versa P Series Chip Types and TechnologiesChip Manufacturer Description TechnologyP54C Intel 75 MHz CPU 320-pin TCPPT86C868/PT86C718Pico Power System Logic 144-pin TQFP/176-pin TQFPN28F020-150 Intel 256k x 8 Flash ROM 32-pin PLCCPT86C718 Pico Power IDE Interface, PeripheralController, InterruptMultiplexer176-pin TQFPC&T65545 Chips &TechnologiesVGA Controller 208-pin QFPPC87334VJG NationalSemiconductorDiskette Controller, IDE,Parallel Interface100-pin TQFPM38802M2-001HP Mitsubishi Keyboard Controller 64-pin TQFPCL-PD6720-B-2 Cirrus Logic PCMCIA Controller 208-pin QFP
