EM386X Motherboard Settings and Configuration

MYLEX CORPORATION

EM386X

Processor
80386DX
Processor Speed
25/33MHz
Chip Set
Unidentified
Max. Onboard DRAM
32MB
Cache
16/32/64/128KB
BIOS
AMI/Award/Mylex/Phoenix
Dimensions
305mm x 330mm
I/O Options
32-bit Intel slots (2), 32-bit external memory card
NPU Options
80287/80387DX/3167

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
BAT
Power LED & keylock
J17
Turbo switch
J6
Reset switch
J18
Single-step control switch
J10
32-bit Intel slots
SL1 & SL2
Speaker connector
J14
32-bit external memory card
SL3
Turbo LED
J16

USER CONFIGURABLE SETTINGS
Function
Jumper
Position

I/O bus speed select 1 wait states
J1
Closed

I/O bus speed select 2 wait states
J1
Open
»
Factory configured - do not alter
J2
Closed
»
Monitor type select monochrome
J3
pins 1 & 2 closed

Monitor type select color
J3
pins 2 & 3 closed
»
AT bus DRAM refresh signal disabled
J4
Closed

AT bus DRAM refresh signal enabled
J4
Open
»
80386 <Rev. D NPU interface bug bypass disabled
J5
Open

80386 <Rev. D NPU interface bug bypass enabled
J5
Closed
»
Turbo mode enabled
J6
Open

Turbo mode disabled
J6
Closed
»
Cache enabled
J9
Open

Cache disabled
J9
Closed
»
Factory configured - do not alter
J11
N/A
»
Factory configured - do not alter
J13
pins 1 & 2 closed
»
Factory configured - do not alter
J15
pins 1 & 2 closed
»
Factory configured - do not alter
J22
N/A
»
Factory configured - do not alter
J23
Closed
»
Factory configured - do not alter
J26
N/A
»
Factory configured - do not alter
J27
Closed
»
Memory access on Intel 32-bit bus cached
J28
Closed

Memory access on Intel 32-bit bus cached
J28
Open
»
ROM address select 0F0000 and FF0000
J30
Open

ROM address select 0F0000
J30
Closed
»
Factory configured - do not alter
J33
N/A
»
NPU type select 80387
J34
Closed

NPU type select 80287
J34
Open
»
NPU synchronous with CPU
J35
Open

NPU asynchronous with CPU
J35
Closed
»
Factory configured - do not alter
J37
pins 1 & 2 closed
»
Factory configured - do not alter
J38
N/A
»
80387 reset normal
J40
Open

80387 reset on port F1h
J40
Closed

USER CONFIGURABLE SETTINGS (CON’T)
Function
Jumper/Switch
Position
»
ROM caching disabled
J41
Open

ROM caching enabled
J41
Closed
»
Single step mode disabled
J42
pins 2 & 3 closed

Single step mode enabled
J42
pins 1 & 2 closed
»
Factory configured - do not alter
J43
N/A
»
BIOS speed select 250ns
J44
pins 3 & 4 closed

BIOS speed select 200ns
J44
pins 1 & 2 closed

BIOS speed select 200ns for 25MHz machine
J44
Open

BIOS speed select 150ns for 33MHz machine
J44
Open
»
Factory configured - do not alter
J46
N/A
»
Factory configured - do not alter
J47
N/A
»
Factory configured - do not alter
J48
N/A
»
Factory configured - do not alter
J49
N/A
»
Factory configured - do not alter
J50
N/A
»
Intel NPU not installed
SW0/1
On

Intel NPU installed
SW0/1
Off
»
No ISA bus card installed w/memory between 12 and 14MB
SW0/2
On

ISA bus card installed with memory between 12 and 14MB
SW0/2
Off

ROM shadowing disabled
SW0/8
On

ROM shadowing enabled
SW0/8
Off
»
Factory configured - do not alter
SW0/9
N/A
»
Factory configured - do not alter
SW0/10
N/A

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
16KB
(8) 4K x 4
NONE
(>1) 4K x 4
32KB 1
(8) 4K x 4
(8) 4K x 4
(>1) 16K x 4
32KB 2
(8) 8K x 4
NONE
(>1) 16K x 4
64KB
(8) 16K x 4
NONE
(>1) 16K x 4
128KB
(8) 16K x 4
(8) 16K x 4
(>1) 16K x 4
Note: The exact location and number of tag chips is unidentified.

CACHE JUMPER CONFIGURATION
Size
J7
J8
J12
J29
J31
16KB
pins 5 & 6 closed
pins 3 & 4 closed
pins 5 & 6 closed
Open
pins 1 & 2 closed
32KB 1
pins 5 & 6 closed
pins 5 & 6 closed
pins 5 & 6 closed
Closed
pins 5 & 6 closed
32KB 2
pins 5 & 6 closed
pins 5 & 6 closed
pins 5 & 6 closed
Open
pins 1 & 2 closed
64KB
pins 5 & 6 closed
pins 5 & 6 closed
pins 3 & 4 closed
Open
pins 1 & 2 closed
128KB
pins 3 & 4 closed
pins 5 & 6 closed
pins 3 & 4 closed
Closed
pins 3 & 4 closed

CACHE JUMPER CONFIGURATION (CON’T)
Size
J36
J39
J51
J52
16KB
pins 2 & 3 closed
pins 5 & 6 closed
pins 2 & 3 closed
pins 2 & 3 closed
32KB 1
pins 2 & 3 closed
pins 7 & 8 closed
pins 2 & 3 closed
pins 2 & 3 closed
32KB 2
pins 2 & 3 closed
pins 5 & 6 closed
pins 2 & 3 closed
pins 2 & 3 closed
64KB
pins 1 & 2 closed
pins 5 & 6 closed
pins 1 & 2 closed
pins 1 & 2 closed
128KB
pins 1 & 2 closed
pins 3 & 4 closed
pins 1 & 2 closed
pins 1 & 2 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(4) 256K x 9
NONE
2MB
(4) 256K x 9
(4) 256K x 9
4MB
(4) 1M x 9
NONE
8MB
(4) 1M x 9
(4) 1M x 9
16MB
(4) 4M x 9
NONE
32MB
(4) 4M x 9
(4) 4M x 9

DRAM SWITCH CONFIGURATION
Size
EMS Size
SW1/1
SW1/2
SW1/3
SW1/4
1MB
NONE
On
On
On
On
1MB
0.375MB
Off
On
On
On
2MB
1MB
On
On
Off
On
2MB
1.375MB
Off
On
Off
On
4MB
3MB
On
On
Off
Off
4MB
3.375MB
Off
On
Off
Off
8MB
7MB
Off
On
Off
Off
8MB
7.375MB
On
Off
On
On
16MB
13MB
On
Off
On
Off
16MB
14.875MB
On
Off
Off
On
32MB
30.875MB
On
Off
Off
Off

DRAM SPEED CONFIGURATION
CPU Speed
DRAM Speed
J25
SW0/5
SW0/6
SW0/7
25MHz
80ns
pins 1 & 2 closed
On
On
On
25MHz
100ns
pins 3 & 4 closed
Off
Off
Off
33MHz
60ns
pins 1 & 2 closed
On
On
On
33MHz
80ns
pins 3 & 4 closed
Off
Off
Off

BIOS TYPE CONFIGURATION
» Type
J21
J24
»
27256
pins 1 & 2 closed
pins 2 & 3 closed
»
27128
pins 1 & 2 closed
pins 1 & 2 closed
»
27512
pins 2 & 3 closed
pins 2 & 3 closed

CACHEABLE AREA SELECTION
Cacheable RAM
Min. cache size
SW0/2
SW0/3
SW0/4
32MB
128KB
N/A
Off
Off
16MB
64KB
N/A
On
Off
14MB
128KB
Off
Off
On
8MB
128KB
On
Off
On
4MB
N/A
N/A
On
On

DRAM/CACHE MODE CONFIGURATION
DRAM size
Interleave
Cache size
J19
J20
J1/M
J2/M
1MB
No
Any
Open
2 & 3
1 & 2
1 & 2
2MB
No
Any
3 & 4
Open
1 & 2
1 & 2
2MB
Yes
16KB
Open
1 & 2
1 & 2
3 & 4
2MB
Yes
32KB 1
1 & 2
Open
3 & 4
1 & 2
2MB
Yes
32KB 2
Open
1 & 2
1 & 2
3 & 4
2MB
Yes
64KB
Open
1 & 2
1 & 2
3 & 4
2MB
Yes
128KB
1 & 2
Open
3 & 4
1 & 2
4MB
No
Any
Open
2 & 3
1 & 2
1 & 2
8MB
No
Any
5 & 6
Open
1 & 2
1 & 2
8MB
Yes
16KB
Open
1 & 2
1 & 2
5 & 6
8MB
Yes
32KB 1
1 & 2
Open
5 & 6
1 & 2
8MB
Yes
32KB 2
Open
1 & 2
1 & 2
5 & 6
8MB
Yes
64KB
Open
1 & 2
1 & 2
5 & 6
8MB
Yes
128KB
1 & 2
Open
5 & 6
1 & 2
16MB
No
Any
Open
2 & 3
1 & 2
1 & 2
32MB
No
Any
7 & 8
Open
1 & 2
1 & 2
32MB
Yes
16KB
Open
1 & 2
1 & 2
7 & 8
32MB
Yes
32KB 1
1 & 2
Open
7 & 8
1 & 2
32MB
Yes
32KB 2
Open
1 & 2
1 & 2
7 & 8
32MB
Yes
64KB
Open
1 & 2
1 & 2
7 & 8
32MB
Yes
128KB
1 & 2
Open
7 & 8
1 & 2
Note: Pins designated should be in the closed position.

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EM386X Motherboard Settings and Configuration

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Processor	80386DX
Processor Speed	25/33MHz
Chip Set	Unidentified
Max. Onboard DRAM	32MB
Cache	16/32/64/128KB
BIOS	AMI/Award/Mylex/Phoenix
Dimensions	305mm x 330mm
I/O Options	32-bit Intel slots (2), 32-bit external memory card
NPU Options	80287/80387DX/3167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	BAT	Power LED & keylock	J17
Turbo switch	J6	Reset switch	J18
Single-step control switch	J10	32-bit Intel slots	SL1 & SL2
Speaker connector	J14	32-bit external memory card	SL3
Turbo LED	J16

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
	I/O bus speed select 1 wait states	J1	Closed
	I/O bus speed select 2 wait states	J1	Open
»	Factory configured - do not alter	J2	Closed
»	Monitor type select monochrome	J3	pins 1 & 2 closed
	Monitor type select color	J3	pins 2 & 3 closed
»	AT bus DRAM refresh signal disabled	J4	Closed
	AT bus DRAM refresh signal enabled	J4	Open
»	80386 <Rev. D NPU interface bug bypass disabled	J5	Open
	80386 <Rev. D NPU interface bug bypass enabled	J5	Closed
»	Turbo mode enabled	J6	Open
	Turbo mode disabled	J6	Closed
»	Cache enabled	J9	Open
	Cache disabled	J9	Closed
»	Factory configured - do not alter	J11	N/A
»	Factory configured - do not alter	J13	pins 1 & 2 closed
»	Factory configured - do not alter	J15	pins 1 & 2 closed
»	Factory configured - do not alter	J22	N/A
»	Factory configured - do not alter	J23	Closed
»	Factory configured - do not alter	J26	N/A
»	Factory configured - do not alter	J27	Closed
»	Memory access on Intel 32-bit bus cached	J28	Closed
	Memory access on Intel 32-bit bus cached	J28	Open
»	ROM address select 0F0000 and FF0000	J30	Open
	ROM address select 0F0000	J30	Closed
»	Factory configured - do not alter	J33	N/A
»	NPU type select 80387	J34	Closed
	NPU type select 80287	J34	Open
»	NPU synchronous with CPU	J35	Open
	NPU asynchronous with CPU	J35	Closed
»	Factory configured - do not alter	J37	pins 1 & 2 closed
»	Factory configured - do not alter	J38	N/A
»	80387 reset normal	J40	Open
	80387 reset on port F1h	J40	Closed

USER CONFIGURABLE SETTINGS (CON’T)
Function		Jumper/Switch	Position
»	ROM caching disabled	J41	Open
	ROM caching enabled	J41	Closed
»	Single step mode disabled	J42	pins 2 & 3 closed
	Single step mode enabled	J42	pins 1 & 2 closed
»	Factory configured - do not alter	J43	N/A
»	BIOS speed select 250ns	J44	pins 3 & 4 closed
	BIOS speed select 200ns	J44	pins 1 & 2 closed
	BIOS speed select 200ns for 25MHz machine	J44	Open
	BIOS speed select 150ns for 33MHz machine	J44	Open
»	Factory configured - do not alter	J46	N/A
»	Factory configured - do not alter	J47	N/A
»	Factory configured - do not alter	J48	N/A
»	Factory configured - do not alter	J49	N/A
»	Factory configured - do not alter	J50	N/A
»	Intel NPU not installed	SW0/1	On
	Intel NPU installed	SW0/1	Off
»	No ISA bus card installed w/memory between 12 and 14MB	SW0/2	On
	ISA bus card installed with memory between 12 and 14MB	SW0/2	Off
	ROM shadowing disabled	SW0/8	On
	ROM shadowing enabled	SW0/8	Off
»	Factory configured - do not alter	SW0/9	N/A
»	Factory configured - do not alter	SW0/10	N/A

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
16KB	(8) 4K x 4	NONE	(>1) 4K x 4
32KB 1	(8) 4K x 4	(8) 4K x 4	(>1) 16K x 4
32KB 2	(8) 8K x 4	NONE	(>1) 16K x 4
64KB	(8) 16K x 4	NONE	(>1) 16K x 4
128KB	(8) 16K x 4	(8) 16K x 4	(>1) 16K x 4
Note: The exact location and number of tag chips is unidentified.

CACHE JUMPER CONFIGURATION
Size	J7	J8	J12	J29	J31
16KB	pins 5 & 6 closed	pins 3 & 4 closed	pins 5 & 6 closed	Open	pins 1 & 2 closed
32KB 1	pins 5 & 6 closed	pins 5 & 6 closed	pins 5 & 6 closed	Closed	pins 5 & 6 closed
32KB 2	pins 5 & 6 closed	pins 5 & 6 closed	pins 5 & 6 closed	Open	pins 1 & 2 closed
64KB	pins 5 & 6 closed	pins 5 & 6 closed	pins 3 & 4 closed	Open	pins 1 & 2 closed
128KB	pins 3 & 4 closed	pins 5 & 6 closed	pins 3 & 4 closed	Closed	pins 3 & 4 closed

CACHE JUMPER CONFIGURATION (CON’T)
Size	J36	J39	J51	J52
16KB	pins 2 & 3 closed	pins 5 & 6 closed	pins 2 & 3 closed	pins 2 & 3 closed
32KB 1	pins 2 & 3 closed	pins 7 & 8 closed	pins 2 & 3 closed	pins 2 & 3 closed
32KB 2	pins 2 & 3 closed	pins 5 & 6 closed	pins 2 & 3 closed	pins 2 & 3 closed
64KB	pins 1 & 2 closed	pins 5 & 6 closed	pins 1 & 2 closed	pins 1 & 2 closed
128KB	pins 1 & 2 closed	pins 3 & 4 closed	pins 1 & 2 closed	pins 1 & 2 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
32MB	(4) 4M x 9	(4) 4M x 9

DRAM SWITCH CONFIGURATION
Size	EMS Size	SW1/1	SW1/2	SW1/3	SW1/4
1MB	NONE	On	On	On	On
1MB	0.375MB	Off	On	On	On
2MB	1MB	On	On	Off	On
2MB	1.375MB	Off	On	Off	On
4MB	3MB	On	On	Off	Off
4MB	3.375MB	Off	On	Off	Off
8MB	7MB	Off	On	Off	Off
8MB	7.375MB	On	Off	On	On
16MB	13MB	On	Off	On	Off
16MB	14.875MB	On	Off	Off	On
32MB	30.875MB	On	Off	Off	Off

DRAM SPEED CONFIGURATION
CPU Speed	DRAM Speed	J25	SW0/5	SW0/6	SW0/7
25MHz	80ns	pins 1 & 2 closed	On	On	On
25MHz	100ns	pins 3 & 4 closed	Off	Off	Off
33MHz	60ns	pins 1 & 2 closed	On	On	On
33MHz	80ns	pins 3 & 4 closed	Off	Off	Off

BIOS TYPE CONFIGURATION
» Type		J21	J24
»	27256	pins 1 & 2 closed	pins 2 & 3 closed
»	27128	pins 1 & 2 closed	pins 1 & 2 closed
»	27512	pins 2 & 3 closed	pins 2 & 3 closed

CACHEABLE AREA SELECTION
Cacheable RAM	Min. cache size	SW0/2	SW0/3	SW0/4
32MB	128KB	N/A	Off	Off
16MB	64KB	N/A	On	Off
14MB	128KB	Off	Off	On
8MB	128KB	On	Off	On
4MB	N/A	N/A	On	On

DRAM/CACHE MODE CONFIGURATION
DRAM size	Interleave	Cache size	J19	J20	J1/M	J2/M
1MB	No	Any	Open	2 & 3	1 & 2	1 & 2
2MB	No	Any	3 & 4	Open	1 & 2	1 & 2
2MB	Yes	16KB	Open	1 & 2	1 & 2	3 & 4
2MB	Yes	32KB 1	1 & 2	Open	3 & 4	1 & 2
2MB	Yes	32KB 2	Open	1 & 2	1 & 2	3 & 4
2MB	Yes	64KB	Open	1 & 2	1 & 2	3 & 4
2MB	Yes	128KB	1 & 2	Open	3 & 4	1 & 2
4MB	No	Any	Open	2 & 3	1 & 2	1 & 2
8MB	No	Any	5 & 6	Open	1 & 2	1 & 2
8MB	Yes	16KB	Open	1 & 2	1 & 2	5 & 6
8MB	Yes	32KB 1	1 & 2	Open	5 & 6	1 & 2
8MB	Yes	32KB 2	Open	1 & 2	1 & 2	5 & 6
8MB	Yes	64KB	Open	1 & 2	1 & 2	5 & 6
8MB	Yes	128KB	1 & 2	Open	5 & 6	1 & 2
16MB	No	Any	Open	2 & 3	1 & 2	1 & 2
32MB	No	Any	7 & 8	Open	1 & 2	1 & 2
32MB	Yes	16KB	Open	1 & 2	1 & 2	7 & 8
32MB	Yes	32KB 1	1 & 2	Open	7 & 8	1 & 2
32MB	Yes	32KB 2	Open	1 & 2	1 & 2	7 & 8
32MB	Yes	64KB	Open	1 & 2	1 & 2	7 & 8
32MB	Yes	128KB	1 & 2	Open	7 & 8	1 & 2
Note: Pins designated should be in the closed position.