UNIDENTIFIED

VGA GRAPHICS ADAPTER

Category

Video

Video Types Supported

XVGA

Video Processor

Trident TVGA 8900

Highest Resolution Supported

1024 x768

Data Bus Type

16-bit ISA

Memory Type

DRAM

Maximum Onboard Memory

2MB

CONNECTIONS

Purpose

Location

Purpose

Location

15-pin analog video port

CN1

9-pin TTL port

CN3

VGA feature connector

CN2

   

INTERRUPT

IRQ9

J1

»

Disabled

Pins 2 & 3 closed

 

Enabled

Pins 1 & 2 closed

MONITOR SELECT

Setting

SW1/A

SW1/B

VBA

On

On

EGA

Off

On

CGA

On

Off

MDA/Hercules

Off

Off

Note:SW1/A & B affects 9-pin TTL connection. Not present on all cards.

REFRESH RATE

Rate

SW1/C

Less than 48MHz

On

48-49MHz

Off

ADDRESS DECODE

Setting

SW1/E

»

Fast address decode

Off

 

Slow address decode

On

8/16 BUS SELECT

Setting

SW1/F

»

16-bit

Off

 

8-bit

On

BUS SIZE DETECTION

Setting

J2

Autodetect

Pins 2 & 3 closed

Standard interface

Pins 1 & 2 closed

Note: J2 orientation varies. Check pin numbers on card.

CLOCK SPEED

Setting

J4

»

40MHz(512KB)

Pins 2 & 3 closed

 

48Mhz(1 & 2MB)

Pins 1 & 2 closed

Note: Location of J4 unidentified. Not present on all cards.

J3

DRAM SIZE

Size

JP1

JP2

J3

512KB

Open

Closed

Pins 1 & 2, 4 & 5 closed

1MB

Open

Closed

Pins 1 & 4, 2 & 5 closed

2MB

Closed

Open

Pins 2 & 3, 5 & 6 closed

Note: JP1 & 2 are jumper blocks, number of pins unidentified. Not present on all cards. Orientation of J3 unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

512KB

(2)256KB x 4

None

None

1MB

(2)256KB x 4

(2)256KB x 4

None

2MB

(2)256KB x 4

(2)256KB x 4

(4)256KB x 4

Note: DRAM not configurable on all cards.

FACTORY CONFIGURED SETTINGS

Switch

Position

SW1/D

On