HP 520 5/XX, 525 5/XX manual S3 Trio 64 Video Memory, S3 Trio 64 Video Modes, 121

5 Video Controllers

The Integrated Ultra VGA Video Controller

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.

Standard VGA Modes (S3 Trio 64)

Mode No.	Standard	Interface	Resolution	No. of	Vertical	Horizontal	Dot Clock
		Type		Colors	Refresh (Hz)	Refresh (kHz)	(MHz)
00h	VGA	text	40 x 25 chars	b/w	70	31.5	25.175
00h	VGA	text	40 x 25 chars	b/w	70	31.5	25.175
00h+	VGA	text	40 x 25 chars	b/w	70	31.5	28.322
01h	VGA	text	40 x 25 chars	16	70	31.5	25.175
01h	VGA	text	40 x 25 chars	16	70	31.5	25.175
01h+	VGA	text	40 x 25 chars	16	70	31.5	28.322
02h	VGA	text	80 x 25 chars	b/w	70	31.5	25.175
02h	VGA	text	80 x 25 chars	b/w	70	31.5	25.175
02h+	VGA	text	80 x 25 chars	b/w	70	31.5	28.322
03h	VGA	text	80 x 25 chars	16	70	31.5	25.175

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