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M&M BASIC

OMNICOMP GRAPHICS CORPORATION

M&M BASIC

Category

Video

Video Types Supported

VGA

Video Processor

S2C9001

Highest Resolution Supported

720 x 480

Data Bus Type

16-bit ISA

Memory Type

N/A

Maximum Onboard Memory

N/A

CONNECTIONS

Purpose

Location

Purpose

Location

Video input connector

CN1

VESA feature connector

JP4

Video output connector

CN2

   

I/O REGISTER SPACE CONFIGURATION

Setting

JP1

Ľ

Fixed

Pins 1 & 2 closed

 

Programmed

Pins 2 & 3 closed

BASE I/O ADDRESS SELECTION

Address

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

SW1/8

100h

Off

On

On

On

On

On

On

On

200h

On

Off

On

On

On

On

On

On

300h

Off

Off

On

On

On

On

On

On

400h

On

On

Off

On

On

On

On

On

500h

Off

On

Off

On

On

On

On

On

FB00h

Off

Off

On

Off

Off

Off

Off

Off

FC00h

On

On

Off

Off

Off

Off

Off

Off

FD00h

Off

On

Off

Off

Off

Off

Off

Off

FE00h

On

Off

Off

Off

Off

Off

Off

Off

FF00h

Off

Off

Off

Off

Off

Off

Off

Off

Note: A total of 255 base address settings are available. The switches are a binary representation of the decimal memory addresses. SW1/8 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/8=32768, SW1/7=16384, SW1/6=8192, SW1/5=4096, SW1/4=2048, SW1/3=1024, SW1/2=512, SW1/1=256. Turn off the switches and add the values of the switches that are off to obtain the correct memory address. (Off=1, On=0)

VIDEO INPUT IMPEDANCE SELECTION

Setting

SW4/2

SW4/3

SW4/4

Red display signal from VGA card

Off

Off

Off

Green display signal from VGA card

Off

Off

Off

Blue display signal from VGA card

Off

Off

Off

Channel 1 composite video or Y of S-video

Off

Off

Off

Channel 2 composite video or Y of S-video

Off

Off

Off

Channel 3 composite video or Y of S-video

Off

Off

Off

Channel 1 C of S-video

Off

Off

On

Channel 2 C of S-video

Off

On

Off

Channel 3 C of S-video

On

Off

Off

VIDEO INPUT IMPEDANCE SELECTION (CONíT)

Setting

SW4/5

SW4/6

SW4/7

Red display signal from VGA card

Off

Off

Off

Green display signal from VGA card

Off

Off

Off

Blue display signal from VGA card

Off

Off

Off

Channel 1 composite video or Y of S-video

Off

Off

On

Channel 2 composite video or Y of S-video

Off

On

Off

Channel 3 composite video or Y of S-video

On

Off

Off

Channel 1 C of S-video

Off

Off

Off

Channel 2 C of S-video

Off

Off

Off

Channel 3 C of S-video

Off

Off

Off

VIDEO INPUT IMPEDANCE SELECTION (CONíT)

Setting

SW4/8

SW4/9

SW4/10

Red display signal from VGA card

Off

Off

On

Green display signal from VGA card

Off

On

Off

Blue display signal from VGA card

On

Off

Off

Channel 1 composite video or Y of S-video

Off

Off

Off

Channel 2 composite video or Y of S-video

Off

Off

Off

Channel 3 composite video or Y of S-video

Off

Off

Off

Channel 1 C of S-video

Off

Off

Off

Channel 2 C of S-video

Off

Off

Off

Channel 3 C of S-video

Off

Off

Off

MISCELLANEOUS TECHNICAL NOTE

SW2 is the Video Color Switch. It is used to adjust the timing of the color information in the video signal. SW2 consists of six switches the default is the SW2/4 switch in the On position, & the rest of the switches in the Off position. You must use a "trial and error" process to adjust SW2. Only one switch can be On at any given time.

MISCELLANEOUS TECHNICAL NOTE

SW3 is the Color Key Skew Switch. It is used to adjust the timing of the color key signal. SW3 consists of six switches the default is the SW3/4 switch in the On position, & the rest of the switches in the Off position. You must use a "trial and error" process to adjust SW3. Only one switch can be On at any given time.

FACTORY CONFIGURED - DO NOT ALTER

Switch

Position

SW4/1

On