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
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
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) | ||||
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00h | VGA | text | 40 x 25 chars | b/w | 70 | 31.5 | 25.175 | |
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00h | VGA | text | 40 x 25 chars | b/w | 70 | 31.5 | 25.175 | |
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00h+ | VGA | text | 40 x 25 chars | b/w | 70 | 31.5 | 28.322 | |
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01h | VGA | text | 40 x 25 chars | 16 | 70 | 31.5 | 25.175 | |
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01h | VGA | text | 40 x 25 chars | 16 | 70 | 31.5 | 25.175 | |
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01h+ | VGA | text | 40 x 25 chars | 16 | 70 | 31.5 | 28.322 | |
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02h | VGA | text | 80 x 25 chars | b/w | 70 | 31.5 | 25.175 | |
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02h | VGA | text | 80 x 25 chars | b/w | 70 | 31.5 | 25.175 | |
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02h+ | VGA | text | 80 x 25 chars | b/w | 70 | 31.5 | 28.322 | |
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03h | VGA | text | 80 x 25 chars | 16 | 70 | 31.5 | 25.175 | |
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