Parallel Interface - NEC VERSA 4000 Service Manual

Table Section 1-4 LCD Display Mode (640 x 480 DSTN, Simultaneous CRT
Mode Display
(Hex) Mode
F Planar
10 Planar
11 Planar
12 Planar
13 Packed
Pixel
20 4-bit
linear
30 8-bit
linear
78 Packed
Pixel
79 Packed
Pixel
*EGA Extension
**VGA Extension

PARALLEL INTERFACE

The system's parallel interface integrates National Semiconductor's PC87334 chip. It uses a
25-pin D-subconnector. The port is located on the system's rear panel.
The modes of operation available for a PC87334 chip are
T
compatibility mode
T
nibble mode
T
byte mode
T
Enhanced Capabilitied Port (ECP)
T
Enhanced Parallel Port (EPP).
The user selects between three parallel interface modes using Auto Setup. These include
unidirectional, bidirectional or enhanced. Unidirectional mode sends data output from the
standard ISA port only. Bidirectional 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 bidirectional modes.
Display)
Text
Colors Display Resolution Font
Mono 80x25 640x350
16 80x25 640x350
2 80x30 640x480
16 80x30 640x480
256 40x25 320x200
16 80x30 640x480
256 80x30 640x480
256 80x25 640x400
256 80x30 640x480
Technical Information
Refesh
Rate
8x14 60
8x14 60
8x16 60
8x16 60
8x8 60
8x16 60
8x16 60
8x16 60
8x16 60
1-11