System Video; Parallel Interface; Memory Map - NEC VERSA 6060 Service Manual

MEMORY SPACE
000000-0003FFh
000400-0004FFh
000500-09FFFFh
0A0000-0AFFFFh
0B0000-0B7FFFh
0B8000-0BFFFFh
0C0000-0CBFFFh
0CC000-0CFFFFh
0D0000-0DFFFFh
0E0000-0EFFFFh
0F0000h-0FFFFFh
100000h-1FFFFFF
2000000-5FFFFFF

SYSTEM VIDEO

The system's LCD operates using the NeoMagic NMG4 Controller. Video signals travel
from the controller through the system's 15-pin D-SUB connector.
System video integrates a PCI-bus interface. The system ships with 2 MB Video RAM
(VRAM). It supports video modes up to 1024 x 768 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 PC87338 chip with a
25-pin D-subconnector. The port is located on the system's rear panel.
The modes of operation available for a PC87338 chip are:
T
compatibility mode
T
nibble mode
Table 1-2 Memory Map
SIZE FUNCTION
768 bytes BIOS Interrupt Vector Table
256 bytes BIOS Data Area
640 KB Applications Memory (used by the OS, device
drivers, TSRs, and all DOS applications)
64 KB Video Buffer (EGA and VGA)
32 KB Video buffer (monochrome, CGA color, VGA
monochrome)
32 KB Video Buffer (CGA, EGA color, and VGA color)
48 KB Video ROM (EGA and VGA)
16 KB Unused, (Reserved for adapter ROMs and other
devices requiring ROMs)
64 KB Used by Adapter ROMs (i.e., network controllers,
hard disk controllers, SCSI host adapters)
64 KB Used by System ROM adapters (i.e., network
controllers with boot capability)
64 KB System AMIBIOS (includes Setup and hard disk
drive utilities)
32 MB Built-in Extended Memory
64 MB Extended Memory
Technical Information 1-15