MICRONICS MOTHERBOARD

80486xx VL JX30WB baby size (09-00192-xx)

This document is for the baby-sized (13.3" x 8.5") JX30WB VL-Bus motherboard.

The part number for this board is 09-00192-xx.

It's identifying features are:

An LED between expansion slots #5 and #6.

Seven 16-bit expansion slots; two 32-bit VL-Bus/ISA expansion slots.

Four 72 pin sockets for 36 bit SIMMs, (front left corner of MB).

A ZIF socket for an OverDrive CPU.

Two 40 pin EIDE interface connectors.

One 34 pin floppy connector.

Two serial port connectors; one parallel port connector.

The VESA Local Bus speed is determined by the CPU speed. If the CPU is a 486SX-25, or 486DX2-50, the VL-Bus speed is 25mhz.

If the CPU is a 486SX-33, 486DX-33, or 486DX2-66, the VL-Bus bus speed is 33MHz. A 50 MHZ CLK is not yet a current VESA standard specification

The i486DX/4 100 Mhz allows the system board and VL Bus to run at 33MHZ

The i486DX/4 75 Mhz allows the system board and VL Bus to run at 25MHZ

The ISA bus speed for this motherboard is set at 8.33MHz. The CPU clock speed is determined by the clock synthesizer. If the CPU is a 486SX-25, 486DX2-50, or 486DX4/75 the Bus

clock speed is 1/3. For the 486SX-33, 486DX-33, 486DX2-66 and i486DX4/100 CPUs, the Bus clock speed is 1/4.


JUMPER CONNECTOR ASSIGNMENTS

J1	PS/2 mouse connector		J16	IDE interface LED
J4	Aux keyboard connector		J17	Speaker
J9	External battery		J18	Turbo switch
J10	Serial port #1			J19	Turbo LED
J11	Serial port #2			J20	Power LED/keylock
J12	Parallel port			J21	Reset switch
J13	Primary EIDE interface		SL1/SL2	VESA local bus slots
J14	Secondary EIDE interface	W6	Green PC connector
J15	Floppy drive interface

USER CONFIGURABLE JUMPERS
Flash BIOS normal operation		W1	2-3
Flash BIOS recovery			W1	1-2
Color monitor				W2	Shorted
Monochrome monitor			W2	Open
CMOS normal operation			W5	1-2
CMOS clear on pwr up			W5	2-3
Primary IDE port enabled		W7	1-2
Primary IDE port disabled		W7	2-3
Parallel port IRQ7			W8	1-2
Parallel port IRQ5			W8	2-3
Factory set do not alter		W16	2-3
Factory set do not alter		W29	Open
Flash BIOS write protected		W31	Closed
Flash BIOS write enabled		W31	Open

The following shows all of the possible memory configurations.

MEMORY CHART CONFIGURATION

MB	0	1	2	3
----	---	---	---	---
4MB	4M
8MB	4M	4M
16MB	4M	4M	4M	4M
16MB	8M	8M
16MB	16M
24MB	8M	8M	8M	8M
32MB	8M	8M	8M	8M
32MB	16M	16M
40MB	16M	16M	4M	4M
48MB	16M	16M	16M
64MB	16M	16M	16M	16M
64MB	32M	32M
72MB	32M	32M	4M	4M
80MB	32M	32M	8M	8M
96MB	32M	32M	16M	16M
128MB	32M	32M	32M	32M	

In the table above, 4M indicates that one 1Mx36 SIMM is installed in the socket.

8M indicates that one 2Mx36 SIMM is installed in the socket.

16M indicates that one 4Mx36 SIMM is installed in the socket.

32M indicates that one 8Mx36 SIMM is installed in the socket.

.

Micronics Computers has tested and verified the following 1Mx36 memory brands:

Micron Technologies, Mitsubishi, Samsung, Texas Instruments, Toshiba

Micronics Computers has tested and verified the following 4Mx36 memory brands:

Mitsubishi, Samsung, Toshiba


CACHE CHIP CONFIGURATION

Size	Bank 0		Bank 1		Tag
128KB	(4)32Kx8	None		(1)32Kx8
256KB	(4)32Kx8	(4)32Kx8	(1)32Kx8
512KB	(4)128Kx8	None		(1)128Kx8
1MB	(4)128Kx8	(4)128Kx8	(1)128Kx8

CACHE JUMPER CONFIGURATION

Size	W13	W14	W15	W17		W30
128KB	1-2	1-2	1-2	1-2,3-4		Open
256KB	2-3	2-3	1-2	2-3,4-5		Open
512KB	2-3	1-2	1-2	1-2,3-4		1-2
1MB	2-3	2-3	2-3	2-3,4-5		1-2

CPU TYPE JUMPERS

Type		W11	W12	W18	W19	W20	W21	W22	W23	W24
SL80486SX	2-3	Open	Open	2-3	2-3	Open	1-2	1-2	2-3
80486SX		2-3	Open	Open	2-3	2-3	Open	Open	1-2	2-3
80487SX		2-3	1-2	Open	2-3	2-3	Open	Open	1-2	2-3
CX486M7(3.3V)	1-2/3-4	2-3	Open	2-3	1-2	Open	Open	2-3	1-2
CX486M7(5V)	1-2/3-4	2-3	Open	2-3	1-2	Open	Open	2-3	1-2
AM486DXL	1-2/3-4	2-3	Open	2-3	2-3	Open	Open	2-3	1-2
SL80486DX	1-2/3-4	2-3	Open	2-3	2-3	Open	1-2	1-2	2-3
80486DX		1-2/3-4	2-3	Open	2-3	2-3	Open	Open	1-2	2-3
SL80486DX2	1-2/3-4	2-3	Open	2-3	2-3	Open	1-2	1-2	2-3
80486DX2	1-2/3-4	2-3	Open	2-3	2-3	Open	Open	1-2	2-3
80486DX4(2x)	1-2/3-4	2-3	2-3	2-3	2-3	Open	Open	1-2	2-3
80486DX4(2.5x)	1-2/3-4	2-3	1-2	2-3	2-3	Open	Open	1-2	2-3
80486DX4(3x)	1-2/3-4	2-3	Open	2-3	2-3	Open	Open	1-2	2-3
P24CT		1-2/3-4	1-2	Open	1-2	2-3	Open	Open	1-2	1-2
P24D		1-2/3-4	2-3	Open	1-2	2-3	1-2	2-3	1-2	1-2
P24T		1-2/3-4	1-2	Open	1-2	2-3	Open	Open	1-2	1-2

CPU TYPE JUMPERS (Cont'd)

Type		W25	W26	W27		W28
SL80486SX	2-3	4-5	1-2/3-4		3-4
80486SX		2-3	4-5	1-2/3-4		3-4
80487SX		2-3	4-5	1-2/3-4		3-4
CX486M7(3.3V)	2-3	2-3	2-3		2-3
CX486M7(5V)	2-3	2-3	2-3/4-5		2-3
AM486DXL	2-3	4-5	1-2/3-4		3-4
SL80486DX	2-3	4-5	1-2/3-4		3-4
80486DX		2-3	4-5	1-2/3-4		3-4
SL80486DX2	2-3	4-5	1-2/3-4		3-4
80486DX2	2-3	4-5	1-2/3-4		3-4
80486DX4(2x)	2-3	4-5	1-2/3-4		3-4
80486DX4(2.5x)	2-3	4-5	1-2/3-4		3-4
80486DX4(3x)	2-3	4-5	1-2/3-4		3-4
P24CT		1-2	1-2	1-2/3-4		3-4
P24D		1-2	4-5	1-2		1-2/3-4
P24T		1-2	1-2	1-2		3-4

CPU SPEED SELECTION

Speed		W10
25MHZ		Open
33MHZ		Closed
50iMHZ		Open
66iMHZ		Closed
75iMHZ		Open
100iMHZ		Closed

DMA CONFIGURATION

DMA		W3	W4
Disabled	Open	Open
DMA1		1-2	1-2
DMA3		2-3	2-3