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G7-B

JUKO LABORATORIES, LTD.

G7-B

Category

Video

Video Types Supported

Monochrome, CGA, EGA

Video Processor

Juko

Highest Resolution Supported

640 x 400

Data Bus Type

8-bit ISA

Memory Type

DRAM

Maximum Onboard Memory

256KB (location unknown)

CONNECTIONS

Purpose

Location

Purpose

Location

9-pin video port

CN1

25-pin parallel port - internal

CN8

Composite video jack

CN2

25-pin serial port - internal

CN9

9-pin mouse port

CN3

25-pin serial port - internal

CN10

6-pin light pen connector

CN5

Control cable connector - floppy drive

CN11

16-pin game port

CN7

   

COMPOSITE COLOR DISPLAY CONFIGURATIONS

Function

Location

Setting

Composite color selected

J1

Pins 1 & 2 closed

Clock frequency is 14.31818 MHz

J3

Pins 1 & 2 closed

   

J5/SW3

Pins 2 & 3 closed

 

Composite color video mode selected

J5/SW4

Pins 2 & 3 closed

   

J5/SW5

Pins 1 & 2 closed

COMPOSITE MONOCHROME DISPLAY CONFIGURATIONS

Function

Location

Setting

 

Composite mono selected

J1

Pins 2 & 3 closed

Clock frequency is 14.31818 MHz

J3

Pins 1 & 2 closed

   

J5/SW3

Pins 2 & 3 closed

 

Composite mono video mode selected

J5/SW4

Pins 1 & 2 closed

   

J5/SW5

Pins 2 & 3 closed

CGA DISPLAY CONFIGURATIONS

Function

Location

Setting

Clock frequency is 14.31818 MHz

J3

Pins 1 & 2 closed

Vertical synchronize pulse is positive

J5/SW1

Pins 1 & 2 closed

Horizontal synchronize pulse is positive

J5/SW2

Pins 1 & 2 closed

   

J5/SW3

Pins 1 & 2 closed

CGA display mode selected

J5/SW4

Pins 2 & 3 closed

   

J5/SW5

Pins 1 & 2 closed

MONOCHROME DISPLAY CONFIGURATIONS

Function

Location

Setting

 

Clock frequency is 16MHz

J3

Pins 3 & 4 closed

 

Vertical synchronize pulse is negative

J5/SW1

Pins 2 & 3 closed

Horizontal synchronize pulse is positive

J5/SW2

Pins 1 & 2 closed

   

J5/SW3

Pins 1 & 2 closed

 

Mono display mode selected

J5/SW4

Pins 1 & 2 closed

   

J5/SW5

Pins 1 & 2 closed

640 X 400 COLOR DISPLAY CONFIGURATIONS

Function

Location

Setting

Clock frequency is 23.4MHz

J3

Pins 5 & 6 closed

Vertical synchronize pulse is negative

J5/SW1

Pins 2 & 3 closed

Horizontal synchronize pulse is negative

J5/SW2

Pins 2 & 3 closed

 

J5/SW3

Pins 1 & 2 closed

640 x 400 display mode selected

J5/SW4

Pins 1 & 2 closed

 

J5/SW5

Pins 2 & 3 closed

MOUSE PORT (CN3) INTERRUPT SELECTION

Setting

J2

IRQ2

Pins 1 & 2 closed

 

IRQ3

Pins 3 & 4 closed

 

IRQ4

Pins 5 & 6 closed

 

IRQ5

Pins 7 & 8 closed

MOUSE PORT MODE

Setting

J6/SW1

Enabled

Pins 1 & 2 closed

 

Disabled

Pins 2 & 3 closed

MOUSE PORT IRQ MATCHING

Setting

J6/SW2

J6/SW3

J6/SW4

J6/SW5

IRQ2

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

 

IRQ3

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

 

IRQ4

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

 

IRQ5

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

PARALLEL PRINTER PORT (CN8) MODE

Setting

J4/SW1

enabled

Pins 1 & 2 closed

 

Disabled

Pins 2 & 3 closed

GAME PORT (CN7) MODE

Setting

J4/SW2

Enabled

Pins 1 & 2 closed

 

Disabled

Pins 2 & 3 closed

REALTIME CLOCK CONFIGURATIONS

Function

Location

Setting

Clock assigned as timer 1 (340-35F)

J7

Pins 1& 2 closed

 

Clock assigned as timer 2 (240-25F)

J7

Pins 2 & 3 closed

Timer uses IRQ4

J10

Pins 1 & 2 closed

 

Timer uses IRQ4

J10

Pins 3 & 4 closed

 

Timer uses IRQ4

J10

Pins 5 & 6 closed

 

Timer uses IRQ4

J10

Pins 7 & 8 closed

SERIAL PORT 2 (CN9) CONFIGURATION

ADDRESS/IRQ

J8

J9

2F8-2FF/IRQ4

Closed

Closed

Port disabled

Open

Open

SERIAL PORT 1 (CN10) CONFIGURATION

ADDRESS/IRQ

J11

J12

3F8-3FF/IRQ4

Closed

Closed

Port disabled

Open

Open