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Microfield Graphics T8C

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Jumper Settings

Category

Video

Video Types Supported

CGA/EGA/VGA/XVGA

Video Processor

Trident

Highest Resolution Supported

1280 x 1024

Data Bus Type

16-bit ISA

Memory Type

VRAM

Maximum Onboard Memory

2048KB

50308-1.png

CONNECTIONS

Purpose

Location

15-pin analog video port

J1

EMULATION TYPE CONFIGURATION

Type

Address

JP1

JP1A

»

VGA/EGA with High Resolution

3DDh - 3DEh

Pins 1 &2 closed

Pins 1 & 2 closed

 

CGA with High Resolution

3DDh - 3DEh

Pins 2 & 3 closed

Pins 2 & 3 closed

 

High resolution

3DDh - 3DEh

Pins 1 & 2 closed

Pins 2 & 3 closed

 

High resolution

30Dh - 30Eh

Pins 2 & 3 closed

Pins 1 & 2 closed

Note:Address setting 30Dh - 30Eh requires special device driver software for operation.

ALTERNATE I/O PORT ADDRESS

Address

S6

»

3xx

Pins 1 & 2 closed

 

1xx

Pins 2 & 3 closed

BIOS SIZE SELECT

Size

J10

16KB

Pins 1 & 2 closed

32KB

Pins 2 & 3 closed

VIDEO FREQUENCY SETTINGS

Frequency

Mode

S1

S2

S7

1280 x 1024

Non-interlaced

Pins 2 & 3 closed

Pins 2 & 3 closed

Open

1280 x 1024

Interlaced

Pins 2 & 3 closed

Pins 1 & 2 closed

Open

1280 x 1024

Non-interlaced

Pins 2 & 3 closed

Pins 2 & 3 closed

Closed

1024 x 768

Non-interlaced

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Note: The last two settings require an optional dual crystal and 512KB microcode EPROM.

DMA CHANNEL SELECT

DRQ

Dack

S5

S8

»

7

7

Pins 1 & 2 closed

Pins 1 & 2 closed

 

6

6

Pins 3 & 4 closed

Pins 3 & 4 closed

 

5

5

Pins 5 & 6 closed

Pins 5 & 6 closed

VIDEO INTERRUPT SELECT

IRQ

S3

»

IRQ10

Pins 3 & 4 closed

 

IRQ9

Pins 1 & 2 closed

 

IRQ11

Pins 5 & 6 closed

 

IRQ12

Pins 7 & 8 closed

 

Disabled

Pins 9 & 10 closed

MONITOR CONNECTOR SENSE

Connector Sense

J8

J9

»

Disabled

Pins 1 & 2 closed

Pins 1 & 2 closed

 

Enabled

Pins 2 & 3 closed

Pins 2 & 3 closed

Note: An optional microcode EPROM must be installed before Connector Sense can be enabled.

See Also