S3 Trio 64 Video Memory; S3 Trio 64 Video Modes - HP 525 5/XX Technical Reference Manual

S3 Trio 64 Video Memory

The S3 Trio 64 PnP integrated video subsystem has 1 MB of video DRAM
preinstalled on the system board, and provides two sockets for the
installation of a pair of 512KB video DRAM chips, to upgrade to video
memory to 2 MB. The installed video memory capacity is detected
automatically by the BIOS.
Normally, the controller gives 32-bit video memory access, with 1 MB of
video RAM fitted. This is increased to 64-bit access when the additional
1 MB upgrade is installed.
When the upgrade modules are installed, care must be exercised to align the
tapered end of the module with the tapered end of the socket on the system
board. A special extraction tool (5041-2553) is needed when removing the
modules.

S3 Trio 64 Video Modes

The video subsystem is responsible for generating video data (which is
placed in video memory) to be sent to the display.
The following table details the Standard and Enhanced Video Graphics
Array (VGA) modes which are currently implemented in the video BIOS.
These modes are supported by standard BIOS functions; that is, the video
BIOS (which is mapped contiguously in the address range C0000h to
C7FFFh) contains all the routines required to configure and access the
video subsystem.
Interface
Mode No. Standard
00h VGA
00h VGA
00h+ VGA
01h VGA
01h VGA
01h+ VGA
02h VGA
02h VGA
02h+ VGA
03h VGA
Standard VGA Modes (S3 Trio 64)
No. of
Resolution
Type Colors
text 40 x 25 chars b/w
text 40 x 25 chars b/w
text 40 x 25 chars b/w
text 40 x 25 chars 16
text 40 x 25 chars 16
text 40 x 25 chars 16
text 80 x 25 chars b/w
text 80 x 25 chars b/w
text 80 x 25 chars b/w
text 80 x 25 chars 16
5 Video Controllers
The Integrated Ultra VGA Video Controller
Vertical Horizontal
Refresh (Hz) Refresh (kHz)
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
70 31.5
Dot Clock
(MHz)
25.175
25.175
28.322
25.175
25.175
28.322
25.175
25.175
28.322
25.175
121