Video Controller; Versa S System Memory Map; Versa S Video Modes - NEC VERSA S Service Manual

1-6 Technical Information
The Versa S supports system and video BIOS shadowing. When shadowing is enabled (de-
fault settings), the BIOS is copied from ROM to RAM which speeds up system perform-
ance. These settings can be changed in the SCU (see Section 2, Setup and Operation).
Table Section 1-2 shows the system's memory map.
Address
FFFFF
F0000
E8000
E0000
C8000
C0000

Video Controller

The Cirrus CL-GD6235 video controller integrates a 32-bit local bus video. The system
ships with 512 KB VRAM supporting LCD video modes up to 640 x 480 resolution with
256 colors (color model) or 64 shades of gray (monochrome model).
The system provides a 15-pin D-SUB connector to allow connecting an external display to
the system. The system supports external display video modes up to 1024 x 768 with 16
colors or 800 x 600 x 256 color (non-interlaced). System video also supports simultaneous
external display and LCD viewing. Table Section 1-3 shows the supported Versa S video
modes.
Mode Pixel
(Hex) Resolution
12 640 x 480
58/6A * 800 x 600
5C * 800 x 600
5D * 1024 x 768
Table Section 1-2 Versa S System
Memory Map
Function
| System BIOS (shadow) (64 KB)
| MAXIMIZER (shadow) (32 KB)
| Video BIOS (shadow enabled) (32 KB)
| ISA space available
| Video BIOS (shadow enabled) (32 KB)
Table Section 1-3 Versa S Video Modes
Character Columns
Size /Rows
8 x 16 30 x 30
8 x 16 100 x 37
8 x 16 100 x 37
8 x 16 128 x 48
Video Horizontal
Colors Clock Freq
(K) (MHz) (kHz)
16/256 25.0 31.5
16/256 40.0 37.8
256/256 40.0 37.9
16 65.0 48.3
Vertical
Freq
(Hz)
60.0
60.0
60.0
60.0