SEAT 286 Motherboard Settings and Configuration

UNIDENTIFIED

SEAT 286

Processor
80286
Processor Speed
12/16/20MHz
Chip Set
G-2
Max. Onboard DRAM
8MB (4MB on external memory card)
Cache
None
BIOS
Unidentified
Dimensions
330mm x 218mm
I/O Options
16-bit external memory card
NPU Options
80287

CONNECTIONS
Purpose
Location
Purpose
Location
Optional keyboard connector
J1
Turbo LED
J11
External battery
J4
Reset switch
J13
Power LED & keylock
J10
Speaker
J15
16-bit external memory card
SL1

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Battery select 3.6v internal
J2
Closed

Battery select 6V external
J2
Open
»
Power good signal detect from board
J3
Pins 1 & 2 closed

Power good signal detect from power supply
J3
Pins 2 & 3 closed
»
Monitor type select color
J5
Closed

Monitor type select monochrome
J5
Open
»
BIOS type select 27256
J6
Pins 2 & 3 closed

BIOS type select 27128
J6
Pins 1 & 2 closed
»
Factory configured - do not alter
J7
N/A
»
Factory configured - do not alter
J8
N/A
»
Parity check disabled
J9
Pins 2 & 3 closed

Parity check enabled
J9
Pins 1 & 2 closed
»
I/O speed select half
J12/1
On

I/O speed select full
J12/1
Off
»
Extended 384K RAM enabled
J12/4
Off

Extended 384K RAM disabled
J12/4
On
»
DRAM type select 1M x 1
J12/6
On

DRAM type select 256K x 4
J12/6
Off
»
NPU asynchronous with CPU
J14
Pins 2 & 3 closed

NPU synchronous with CPU
J14
Pins 1 & 2 closed
»
Turbo enabled
J16
Open

Turbo disabled
J16
Closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
Bank 4
512KB
(4) 44256
NONE
NONE
NONE
NONE
640KB
(4) 44256
NONE
(4) 4464
NONE
NONE
1MB
(4) 44256
(4) 44256
NONE
NONE
NONE
2MB
NONE
NONE
NONE
(16) 421000
NONE
4MB
NONE
NONE
NONE
(16) 421000
(16) 421000

PARITY CONFIGURATION
Size
P0
P1
P2
P3
512KB
(2) 41256
NONE
NONE
NONE
640KB
NONE
NONE
NONE
NONE
1MB
(2) 41256
(2) 41256
NONE
NONE
2MB
NONE
NONE
(2) 421000
NONE
4MB
NONE
NONE
(2) 421000
(2) 421000

DRAM SWITCH CONFIGURATION
Size
J12/2
J12/3
J12/5
512KB
Off
Off
Off
640KB
Off
Off
On
1MB
On
Off
Off
2MB
Off
Off
Off
4MB
On
Off
Off
8MB
On
On
Off
Note: J12/4 & J12/5 must be ON for 640KB

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SEAT 286 Motherboard Settings and Configuration

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Processor	80286
Processor Speed	12/16/20MHz
Chip Set	G-2
Max. Onboard DRAM	8MB (4MB on external memory card)
Cache	None
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	16-bit external memory card
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Optional keyboard connector	J1	Turbo LED	J11
External battery	J4	Reset switch	J13
Power LED & keylock	J10	Speaker	J15
16-bit external memory card	SL1

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Battery select 3.6v internal	J2	Closed
	Battery select 6V external	J2	Open
»	Power good signal detect from board	J3	Pins 1 & 2 closed
	Power good signal detect from power supply	J3	Pins 2 & 3 closed
»	Monitor type select color	J5	Closed
	Monitor type select monochrome	J5	Open
»	BIOS type select 27256	J6	Pins 2 & 3 closed
	BIOS type select 27128	J6	Pins 1 & 2 closed
»	Factory configured - do not alter	J7	N/A
»	Factory configured - do not alter	J8	N/A
»	Parity check disabled	J9	Pins 2 & 3 closed
	Parity check enabled	J9	Pins 1 & 2 closed
»	I/O speed select half	J12/1	On
	I/O speed select full	J12/1	Off
»	Extended 384K RAM enabled	J12/4	Off
	Extended 384K RAM disabled	J12/4	On
»	DRAM type select 1M x 1	J12/6	On
	DRAM type select 256K x 4	J12/6	Off
»	NPU asynchronous with CPU	J14	Pins 2 & 3 closed
	NPU synchronous with CPU	J14	Pins 1 & 2 closed
»	Turbo enabled	J16	Open
	Turbo disabled	J16	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	Bank 4
512KB	(4) 44256	NONE	NONE	NONE	NONE
640KB	(4) 44256	NONE	(4) 4464	NONE	NONE
1MB	(4) 44256	(4) 44256	NONE	NONE	NONE
2MB	NONE	NONE	NONE	(16) 421000	NONE
4MB	NONE	NONE	NONE	(16) 421000	(16) 421000

PARITY CONFIGURATION
Size	P0	P1	P2	P3
512KB	(2) 41256	NONE	NONE	NONE
640KB	NONE	NONE	NONE	NONE
1MB	(2) 41256	(2) 41256	NONE	NONE
2MB	NONE	NONE	(2) 421000	NONE
4MB	NONE	NONE	(2) 421000	(2) 421000

DRAM SWITCH CONFIGURATION
Size	J12/2	J12/3	J12/5
512KB	Off	Off	Off
640KB	Off	Off	On
1MB	On	Off	Off
2MB	Off	Off	Off
4MB	On	Off	Off
8MB	On	On	Off
Note: J12/4 & J12/5 must be ON for 640KB