6300 XT Motherboard Settings and Configuration

AT & T, INC.

6300 XT

Processor
8086
Processor Speed
4.77MHz
Chip Set
None
Max. Onboard DRAM
640KB
Cache
None
BIOS
AT&T
Dimensions
272mm x 254mm
I/O Options
Parallel port, serial ports (2), floppy drive interface
NPU Options
8087

SYSTEM BOARD CONNECTIONS
Purpose
Location
Purpose
Location
To CRT controller board at J9
J1
Serial port 2
J5
To CRT controller board at J11
J2
Keyboard
J6
Serial port 1
J3
Floppy drive
J7
Parallel port
J4
+/- 12V Power
P1
Note:Bus converter board and display enhancement board not shown.

SYSTEM BOARD USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Factory configured - do not alter
JA
N/A
»
Factory configured - do not alter
JB
N/A
»
Clock enabled
JC
Closed

Clock disabled
JC
Open
»
Factory configured - do not alter
JD
N/A
»
Clock battery enabled
JE
Closed

Clock battery disabled
JE
Open
»
NPU enabled
SW0/5
Off

NPU disabled
SW0/5
On
»
Serial interface select 8250
SW0/6
On

Serial interface select 8350
SW0/6
Off
»
BIOS type select 2732
SW0/8
On

BIOS type select 2764
SW0/8
Off
»
Disk drive select 96 TPI
SW1/1
Off

Disk drive select 48 TPI
SW1/1
On
»
Disk drive select fast start-up
SW1/2
Off

Disk drive select slow start-up
SW1/2
On

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
128KB
(9) 4164
(9) 4164
NONE
NONE
256KB
(9) 4164
(9) 4164
(9) 4164
(9) 4164
512KB
(9) 4464
(9) 4464
NONE
NONE
640KB
(9) 4164
(9) 4164
(9) 41256
(9) 41256

DRAM SWITCH CONFIGURATION
Size
SW0/1
SW0/2
SW0/3
SW0/4
128KB
Off
On
On
On
256KB
On
Off
On
On
512KB
On
On
Off
On
640KB
Off
On
Off
On

VIDEO CONFIGURATION
Size
SW1/5
SW1/6
80 columns
On
Off
40 columns
Off
On

HARD DRIVE CONFIGURATION
Setting
SW1/3
SW1/4
Enabled
Off
Off
Disabled
On
On

FLOPPY DRIVE CONFIGURATION
Drives installed
SW1/7
SW1/8
1
On
On
2
Off
On

CRT CONTROLLER BOARD CONNECTIONS
Purpose
Location
Purpose
Location
To bus converter board
J8
Monitor
J12
To system board at J1
J9
To display enhancement board
J13
To bus converter board
J10
+15V Power
P2
To system board at J2
J11

CRT CONTROLLER BOARD USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Oscillator select internal
JF
pins 2 & 3 closed

Oscillator select on display enhancement board
JF
pins 4 & 5 closed
»
Clock select internal
JF
pins 5 & 6 closed

Oscillator select 24MHz
JF
pins 1 & 2 closed

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6300 XT Motherboard Settings and Configuration

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Processor	8086
Processor Speed	4.77MHz
Chip Set	None
Max. Onboard DRAM	640KB
Cache	None
BIOS	AT&T
Dimensions	272mm x 254mm
I/O Options	Parallel port, serial ports (2), floppy drive interface
NPU Options	8087

SYSTEM BOARD CONNECTIONS
Purpose	Location	Purpose	Location
To CRT controller board at J9	J1	Serial port 2	J5
To CRT controller board at J11	J2	Keyboard	J6
Serial port 1	J3	Floppy drive	J7
Parallel port	J4	+/- 12V Power	P1
Note:Bus converter board and display enhancement board not shown.

SYSTEM BOARD USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	JA	N/A
»	Factory configured - do not alter	JB	N/A
»	Clock enabled	JC	Closed
	Clock disabled	JC	Open
»	Factory configured - do not alter	JD	N/A
»	Clock battery enabled	JE	Closed
	Clock battery disabled	JE	Open
»	NPU enabled	SW0/5	Off
	NPU disabled	SW0/5	On
»	Serial interface select 8250	SW0/6	On
	Serial interface select 8350	SW0/6	Off
»	BIOS type select 2732	SW0/8	On
	BIOS type select 2764	SW0/8	Off
»	Disk drive select 96 TPI	SW1/1	Off
	Disk drive select 48 TPI	SW1/1	On
»	Disk drive select fast start-up	SW1/2	Off
	Disk drive select slow start-up	SW1/2	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
128KB	(9) 4164	(9) 4164	NONE	NONE
256KB	(9) 4164	(9) 4164	(9) 4164	(9) 4164
512KB	(9) 4464	(9) 4464	NONE	NONE
640KB	(9) 4164	(9) 4164	(9) 41256	(9) 41256

DRAM SWITCH CONFIGURATION
Size	SW0/1	SW0/2	SW0/3	SW0/4
128KB	Off	On	On	On
256KB	On	Off	On	On
512KB	On	On	Off	On
640KB	Off	On	Off	On

VIDEO CONFIGURATION
Size	SW1/5	SW1/6
80 columns	On	Off
40 columns	Off	On

HARD DRIVE CONFIGURATION
Setting	SW1/3	SW1/4
Enabled	Off	Off
Disabled	On	On

FLOPPY DRIVE CONFIGURATION
Drives installed	SW1/7	SW1/8
1	On	On
2	Off	On

CRT CONTROLLER BOARD CONNECTIONS
Purpose	Location	Purpose	Location
To bus converter board	J8	Monitor	J12
To system board at J1	J9	To display enhancement board	J13
To bus converter board	J10	+15V Power	P2
To system board at J2	J11

CRT CONTROLLER BOARD USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Oscillator select internal	JF	pins 2 & 3 closed
	Oscillator select on display enhancement board	JF	pins 4 & 5 closed
»	Clock select internal	JF	pins 5 & 6 closed
	Oscillator select 24MHz	JF	pins 1 & 2 closed