STO98C Motherboard Settings and Configuration

Processor	80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/40/50(internal)/50/66(internal)
Chip Set	OPTI
Max. Onboard DRAM	32MB
SRAM Cache	64/128/256KB
BIOS	MR
Dimensions	220mm x 220mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J9	Turbo switch	JP12
Power LED & keylock	J18	Turbo LED	JP13
Speaker	JP11	Reset switch	S1

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	JP1	open
	Monitor type select color	JP1	closed
»	CMOS memory normal operation	JP2	pins 2 & 3 closed
	CMOS memory clear	JP2	pins 1 & 2 closed

SRAM CONFIGURATION
Size	Cache	Location	TAG (U31)	TAG (U32)	Dirty Bit (U42)
64KB	(8) 8K x 8	Banks 0 & 1	NONE	(1) 8K x 8	(1) 16K x 4
128KB	(4) 32K x 8	Bank 0	NONE	(1) 8K x 8	(1) 16K x 4
128KB	(4) 32K x 8	Bank 0	NONE	(1) 32K x 8	(1) 16K x 4
256KB	(8) 32K x 8	Banks 0 & 1	NONE	(1) 32K x 8	(1) 16K x 4
256KB	(8) 32K x 8	Banks 0 & 1	(1) 8K x 8	(1) 8K x 8	(1) 16K x 4

SRAM JUMPER CONFIGURATION
Size	JP3	JP4	JP7	JP8
64KB	pins 2 & 3 closed	pins 2 & 3 closed	open	open
128KB	pins 1 & 2 closed	pins 1 & 2 closed	closed	open
128KB	pins 1 & 2 closed	pins 1 & 2 closed	closed	open
256KB	pins 2 & 3 closed	pins 2 & 3 closed	closed	open
256KB 1	pins 2 & 3 closed	pins 2 & 3 closed	open	closed
Note 1 :Jumpers are in this position only when using (2) 8K x 8 in TAG sockets U31 & U32.

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
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9
Note:8 or 9-bit SIMMs can be used.

CPU SPEED CONFIGURATION
Speed	JF0	JF1	JP6	JP10
20MHz	closed	closed	pins 2 & 3 closed	open
25MHz	open	closed	pins 2 & 3 closed	open
33MHz(386/486DLC)	closed	open	pins 2 & 3 closed	pins 1 & 2 closed
33MHz(486)	closed	open	pins 2 & 3 closed	open
40MHz	open	open	pins 2 & 3 closed	pins 1 & 2 closed
50MHz (internal)	open	closed	pins 2 & 3 closed	open
50MHz	open	closed	pins 1 & 2 closed	pins 2 & 3 closed
66MHz (internal)	closed	open	pins 2 & 3 closed	open

CPU TYPE CONFIGURATION
Type	JP5	JP9	JP14	JP15	JP16	JP17
80386DX	1 & 2, 3 & 4	1 & 2, 3 & 4	1 & 2	1 & 2	2 & 3, 4 & 5	closed
CX486DLC	1 & 2, 3 & 4	1 & 2, 3 & 4	1 & 2	1 & 2	2 & 3, 4 & 5	closed
80486SX	2 & 3	open	1 & 2	2 & 3	2 & 3, 4 & 5	open
80487SX	1 & 2, 3 & 4	2 & 3	2 & 3	2 & 3	2 & 3, 4 & 5	open
80486DX	1 & 2, 3 & 4	1 & 2	2 & 3	2 & 3	2 & 3, 4 & 5	open
80486DX2	1 & 2, 3 & 4	1 & 2	2 & 3	2 & 3	2 & 3, 4 & 5	open
Note:The location of JP15 is unknown. Pins designated should be in the closed position