STEP 386 REV. E Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	16/20MHz
Chip Set	C & T
Max. Onboard DRAM	8MB
Cache	64/128KB
BIOS	AMI
Dimensions	355mm x 304mm
I/O Options	32-bit proprietary memory card
NPU Options	80387DX

CONNECTIONS
Purpose	Location
32-bit proprietary memory card	S1

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	J1	Unknown
»	Factory configured - do not alter	SW1	Unknown
»	NPU enabled	W3	Closed
	NPU disabled	W3	Open
»	32-bit memory card enabled	W14	Closed
	32-bit memory card disabled	W14	Open
»	Base memory select 640KB	W16	Closed
	Base memory select 512KB	W16	Open
»	Bus speed select 10MHz	W17	Closed
	Bus speed select 6.7MHz	W17	Open
»	Parity enabled	W20	Closed
	Parity disabled	W20	Open
»	System memory select 2 banks enabled	W21	Closed
	System memory select 1 bank enabled	W21	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	W1	W15
1MB	(4) 256K x 9	NONE	NONE	NONE	Closed	Closed
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE	Closed	Closed
4MB	(4) 1M x 9	NONE	NONE	NONE	Open	Open
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	Closed	Closed
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE	Open	Open
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	Open	Open
Note:Banks 2 & 3, and W1 are located on the external memory Board.

CACHE CONFIGURATION
Size	Cache	Location	TAG	Dirty Bit (U38)
64KB	(8) 16K x 4	Bank 0	(2) 16K x 4	(1) 16K x 4
128KB	(8) 16K x 4	Bank 0 & 1	(2) 16K x 4	(1) 16K x 4
Note:Each CACHE bank must be fully populated when its corresponding DRAM bank is populated.

RESISTOR SIPS CONFIGURATION
Settings	Memory Banks enabled
RP27, RP30, RP58, & RP61 installed	Bank 0
RP28, RP31, RP59, & RP62 installed	Bank 0 & 1
RP29, RP32, RP60, & RP63 installed	Banks 0, 1, 2, & 3

CACHE CONFIGURATION
Size	Cache	Location
64KB	(8) 16K x 4	Bank 2
128KB	(8) 16K x 4	Bank 2 & 3
Note:Each CACHE bank must be fully populated when its corresponding DRAM bank is populated.