System Video; Parallel Interface - NEC Versa 2600 Series Service Manual

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SYSTEM VIDEO

The system's LCD operates using the Chips and Technologies 65550B VGA Controller.
Video signals travel from the controller through the system's 15-pin D-SUB connector us-
ing 5 volts.
System video integrates a PCI-bus interface. The system ships with 1 MB on TFT units and
1.5MB on DSTN of Video RAM (VRAM). It supports video modes up to 800 x 600 with
64K colors in LCD mode.
See Appendix B for a list of Video modes.

PARALLEL INTERFACE

The system's parallel interface integrates National Semiconductor's PC87336VJG Periph-
eral I/O chip with a 25-pin D-subconnector. The port is located on the system's rear panel.
The modes of operation available for a PC87336VJG chip are:
The user selects between three parallel interface modes using Auto Setup. These include
unidirectional, bi-directional or enhanced. Unidirectional mode sends data output from the
standard ISA port only. Bi-directional mode sends data using the standard ISA port or PS/2
technology. Enhanced mode enables high speed data transmission to occur using either the
unidirectional or bi-directional modes.
The default parallel port address is 378h and the interrupt level is IRQ07. Pin locations for
the parallel interface are listed in Appendix A.
T
compatibility mode
T
nibble mode
T
byte mode
T
Extended Capabilities Port (ECP)
T
Enhanced Parallel Port (EPP).
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