External Vga Capability; Keyboard Subsystem - NEC Versa 2500 Series Service Manual

3-8 Hardware Functional Overview
Hardware line drawing
64x64x2 hardware cursor
T
High performance resulting from zero wait-state writes (write buffer) and mini-
mum wait-state reads (internal asynchronous FIFO design)
T
Supports panel resolutions up to 800x600
T
Supports non-interlaced CRT monitors with resolutions up to 1024x768 at 256
colors
T
True-color and Hi-color display capability with flat panels and CRT monitors up
to 800x600 resolution
T
Advanced power management features minimize power consumption during:
Normal operation
Standby (Sleep) modes
Panel-Off Power-Saving Mode
T
Power Sequencing control outputs regulate application of Bias voltage, +5V to
the panel and +12V to the inverter for backlight operation
T
Fully compatible with IBM VGA
T
EIAJ-standard 208-pin plastic flat pack

External VGA Capability

The NEC Versa 2500 Series notebooks provide a 15-pin female D-type external VGA con-
nector that can be connected to an external video graphics adapter (VGA) type monitor.
Another feature of the notebook computer is the ability to auto-sense the display output to
both LCD and the external CRT monitor. The notebook provides external resolution of
1024x768 by 256 colors for the NEC Versa 2500 series with 1 MB video memory. The
NEC Versa 2500 Series can also provide simultaneous display at 800x600 at 256 colors
with the standard VGA DSTN LCD.

KEYBOARD SUBSYSTEM

The Keyboard Subsystem of the notebook is implemented on the I/O Board and Keyboard
Assembly using the Motorola M 38813M4 keyboard controller chip.
The NEC Versa 2500 Series keyboard is an 87/88-key, IBM enhanced-type keyboard with
standard characters and function keys plus 12 programmable function keys. The notebook
also provides an external PS/2 port for supporting an external PS/2 keyboard or standard
DIN-type AT-keyboard. See Section 1 for more information.