486SX SYSTEM Motherboard Settings and Configuration

UNITRON COMPUTER, INC.

486SX SYSTEM

Processor
80486SX/80486DX
Processor Speed
25/33MHz
Chip Set
UMC
Max. Onboard DRAM
32MB
SRAM Cache
32/128KB
BIOS
Phoenix
Dimensions
346mm x 218mm
I/O Options
Floppy drive interface, game port, IDE interface, modem interface, parallel port, serial port (2), VGA port
NPU Options
4167 (location unverified)

CONNECTIONS
Purpose
Location
Purpose
Location
Game port
C1
IDE interface
J22
VGA port
C2
Modem interface
J23
Parallel port
C3
Turbo LED
J26
Serial port 2
C4
Power LED
J28
Serial port 1
C5
Floppy drive interface
J31
Fan power
J3

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Serial port 1 (CN5) enabled
J18
pins 1 & 2 closed

Serial port 1 (CN5) disabled
J18
pins 2 & 3 closed
»
Serial port 1 (CN5) select COM1 (I/O address 3F8-3FFh)
J19
pins 1 & 2 closed

Serial port 1 (CN5) select COM3 (I/O address 3E8-3EFh)
J19
pins 2 & 3 closed
»
Parallel port (C3) select LPT1 interrupt IRQ7 at 378-37F
J20
pins 1 & 2 closed

Parallel port (C3) select LPT2 interrupt IRQ5 at 278-27F
J20
pins 2 & 3 closed
»
Parallel port (CN3) enabled
J21
pins 1 & 2 closed

Parallel port (CN3) disabled
J21
pins 2 & 3 closed
»
IDE interface (J22) enabled
J25
pins 1 & 2 closed

IDE interface (J22) disabled
J25
pins 2 & 3 closed
»
Floppy drive interface (J31) enabled
J27
pins 1 & 2 closed

Floppy drive interface (J31) disabled
J27
pins 2 & 3 closed
»
Serial port 2 (CN4) select COM2 (I/O address 2F8-2FFh)
J29
pins 1 & 2 closed

Serial port 2 (CN4) select COM4 (I/O address 2E8-2EFh)
J29
pins 2 & 3 closed
»
Serial port 2 (CN4) enabled
J30
pins 1 & 2 closed

Serial port 2 (CN4) disabled
J30
pins 2 & 3 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(1) 256K x 36
NONE
2MB
(1) 256K x 36
(1) 256K x 36
3MB
(1) 512K x 36
(1) 256K x 36
4MB
(1) 1M x 36
NONE
5MB
(1) 256K x 36
(1) 1M x 36
8MB
(1) 1M x 36
(1) 1M x 36
12MB
(1) 2M x 36
(1) 1M x 36
16MB
(1) 2M x 36
(1) 2M x 36
32MB
(1) 4M x 36
(1) 4M x 36

CPU TYPE CONFIGURATION
CPU
JP1
JP2
80486DX
pins 1 & 2 closed
pins 1 & 2 and 3 & 4 closed
80486SX
open
pins 2 & 3 closed
Note:The location of jumpers JP1 and JP2 is unknown.

SRAM JUMPER CONFIGURATION
Size
J7
J10
J11
J13
J14
32KB
open
pins 1 & 2
pins 1 & 2
pins 1 & 2
pins 1 & 2
128KB
closed
pins 2 & 3
pins 2 & 3
pins 2 & 3
pins 2 & 3
Note:Pins designated should be in the closed postion.

SRAM CONFIGURATION
Size
Cache SRAM
Location
TAG
32KB
(4) 8K x 8
CACHE
(1) 8K x 8
128KB
(4) 32K x 8
CACHE
(1) 32K x 8
Note:This configuartion is unverified.

VRAM CONFIGURATION
Size
VRAM
Location
256KB
(2) 44256
Bank 0
512KB
(4) 44256
Banks 0 & 1
1MB
(8) 44256
Banks 0, 1, 2 and 3

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486SX SYSTEM Motherboard Settings and Configuration

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Processor	80486SX/80486DX
Processor Speed	25/33MHz
Chip Set	UMC
Max. Onboard DRAM	32MB
SRAM Cache	32/128KB
BIOS	Phoenix
Dimensions	346mm x 218mm
I/O Options	Floppy drive interface, game port, IDE interface, modem interface, parallel port, serial port (2), VGA port
NPU Options	4167 (location unverified)

CONNECTIONS
Purpose	Location	Purpose	Location
Game port	C1	IDE interface	J22
VGA port	C2	Modem interface	J23
Parallel port	C3	Turbo LED	J26
Serial port 2	C4	Power LED	J28
Serial port 1	C5	Floppy drive interface	J31
Fan power	J3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Serial port 1 (CN5) enabled	J18	pins 1 & 2 closed
	Serial port 1 (CN5) disabled	J18	pins 2 & 3 closed
»	Serial port 1 (CN5) select COM1 (I/O address 3F8-3FFh)	J19	pins 1 & 2 closed
	Serial port 1 (CN5) select COM3 (I/O address 3E8-3EFh)	J19	pins 2 & 3 closed
»	Parallel port (C3) select LPT1 interrupt IRQ7 at 378-37F	J20	pins 1 & 2 closed
	Parallel port (C3) select LPT2 interrupt IRQ5 at 278-27F	J20	pins 2 & 3 closed
»	Parallel port (CN3) enabled	J21	pins 1 & 2 closed
	Parallel port (CN3) disabled	J21	pins 2 & 3 closed
»	IDE interface (J22) enabled	J25	pins 1 & 2 closed
	IDE interface (J22) disabled	J25	pins 2 & 3 closed
»	Floppy drive interface (J31) enabled	J27	pins 1 & 2 closed
	Floppy drive interface (J31) disabled	J27	pins 2 & 3 closed
»	Serial port 2 (CN4) select COM2 (I/O address 2F8-2FFh)	J29	pins 1 & 2 closed
	Serial port 2 (CN4) select COM4 (I/O address 2E8-2EFh)	J29	pins 2 & 3 closed
»	Serial port 2 (CN4) enabled	J30	pins 1 & 2 closed
	Serial port 2 (CN4) disabled	J30	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(1) 256K x 36	NONE
2MB	(1) 256K x 36	(1) 256K x 36
3MB	(1) 512K x 36	(1) 256K x 36
4MB	(1) 1M x 36	NONE
5MB	(1) 256K x 36	(1) 1M x 36
8MB	(1) 1M x 36	(1) 1M x 36
12MB	(1) 2M x 36	(1) 1M x 36
16MB	(1) 2M x 36	(1) 2M x 36
32MB	(1) 4M x 36	(1) 4M x 36

CPU TYPE CONFIGURATION
CPU	JP1	JP2
80486DX	pins 1 & 2 closed	pins 1 & 2 and 3 & 4 closed
80486SX	open	pins 2 & 3 closed
Note:The location of jumpers JP1 and JP2 is unknown.

SRAM JUMPER CONFIGURATION
Size	J7	J10	J11	J13	J14
32KB	open	pins 1 & 2	pins 1 & 2	pins 1 & 2	pins 1 & 2
128KB	closed	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3
Note:Pins designated should be in the closed postion.

SRAM CONFIGURATION
Size	Cache SRAM	Location	TAG
32KB	(4) 8K x 8	CACHE	(1) 8K x 8
128KB	(4) 32K x 8	CACHE	(1) 32K x 8
Note:This configuartion is unverified.

VRAM CONFIGURATION
Size	VRAM	Location
256KB	(2) 44256	Bank 0
512KB	(4) 44256	Banks 0 & 1
1MB	(8) 44256	Banks 0, 1, 2 and 3