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Difference between revisions of "Microfield Graphics T8"

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Revision as of 00:42, 24 October 2020

Category

Video

Video Types Supported

XVGA

Video Processor

Trident

Highest Resolution Supported

1280 x 1024

Data Bus Type

16-bit ISA

Memory Type

VRAM

Maximum Onboard Memory

2048KB

50166-1.png

CONNECTIONS

Purpose

Location

15-pin 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.

VIDEO FREQUENCY CONFIGURATION

Frequency

Mode

S1

S2

S7

»

1280 x 1024

Non-interlaced

Pins 1 & 2 closed

Pins 1 & 2 closed

Open

 

1280 x 1024

Interlaced

Pins 1 & 2 closed

Pins 2 & 3 closed

Open

 

1280 x 1024*

Non-interlaced

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

 

1024 x 768*

Non-interlaced

Pins 2 & 3 closed

Pins 2 & 3 closed

Closed

Note: * This is an alternate setting which requires an optional dual crystal and 512K microcode EPROM.

ALTERNATE I/O PORT ADDRESS SELECTION

Address

S6

»

3xx

Pins 2 & 3 closed

 

1xx

Pins 1 &2 closed

DMA CHANNEL SELECTION

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 SELECTION

IRQ

S3

»

2/9

Pins 1 & 2 closed

 

10

Pins 3 & 4 closed

 

11

Pins 5 & 6 closed

 

12

Pins 7 & 8 closed

 

Disabled

Pins 9 & 10 closed

See Also