This document is for the baby-sized (13.3" x 8.5") JX30 VL-Bus motherboard.
The part number for this board is 09-00183-xx.
It's identifying features are: an LED between expansion slots #5 and #6; seven 16-bit
expansion slots; two 16-bit/VL-Bus expansion slots; four sockets for SIMMs; a ZIF socket
for an OverDrive CPU; IDE interface connector; one 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
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 ISA bus speed for this motherboard is set at 8.33MHz. The CPU clock speed is
determined by the Oscillator. If the CPU is a 486SX-25, or 486DX2-50, the Bus
clock speed is 1/3. For the 486SX-33, 486DX-33, or 486DX2-66 CPUs, the Bus
clock speed is 1/4.
The following shows all of the possible memory configurations.
MEMORY CHART CONFIGURATION
===================================
Memory Banks
----------------------------
MB 0 1 2 3
---- ---- ---- ---- ----
1MB 1M
2MB 1M 1M
4MB 4M
6MB 1M 1M 4M
8MB 4M 4M
10MB 1M 1M 4M 4M
12MB 4M 4M 4M
16MB 4M 4M 4M 4M
16MB 16M
18MB 1M 1M 16M
20MB 4M 16M
24MB 4M 4M 16M
32MB 16M 16M
36MB 4M 16M 16M
40MB 4M 4M 16M 16M
48MB 16M 16M 16M
64MB 16M 16M 16M 16M
In the table above, 1M indicates that one 256x36 SIMM is installed in the socket,
4M indicates that one 1Mx36 SIMM is installed in the socket, 16M indicates that,
one 4Mx36 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
+======================================+
+ +
+ MOTHERBOARD SWITCH & JUMPER SETTINGS +
+ +
+======================================+
DIP switch settings for CPU selection
=====================================
DIP Switch 1
----------------------
CPU Speed S1 S2 S3 S4
-------------------------------------------
33MHz or DX2/ 66MHz Off On Off Off
25MHz or DX2/ 50MHz On On Off Off
W70 CPU selection
Pins 2-3 486DX, 486DX2 & P24T
Pins 1-2 486SX
W71 PQFP Surface mounted 486SX
Pins 1-2 PQFP 486SX with Overdrive SX Installed
Pins 2-3 PQFP 486SX with DX, or DX2 CPU Installed
W40 When Local Bus Master controllers are installed {VL SCSI},
jumper W40 must be removed to support local bus DMA.
J12 Serial 16450 Port A
J16 Serial 16450 Port B
J15 Parallel Printer Port
W5 Parallel port I/O direction
Pins 2-3 Output mode (default)
Pins 1-2 Input mode (Scanner)
I/O Port addresses / CMOS Setup
------------------
COM1 3F8h IRQ 4
COM2 2F8h 3
COM3 3E8h 4
COM4 2E8h 3
LPT1 3BCh 7
LPT2 378h 7
LPT3 278h 7
IRQ in use
--------
IRQ 6 Floppy controller
IRQ 14 Primary IDE controller
J18 Floppy connector
J17 Primary IDE connector
W11 IDE LED
Pin 1 - Signal
Pin 2 - Ground
W31 Clearing CMOS Setup
Temporarily install jumper, normal settings are open.
J6 Optional External 4.5-6.0 volt battery connector {Motorola 146818AP RTC Only}
Pin 1 - Battery Positive
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Ground
The JX30 Motherboard does not require an external battery to be installed.
The Dallas / Benchmarq Real Time Clock Chip contains an internal battery for an approximate lifetime of 8-10 years.
W6 Color / Monochrome Display
COLOR - Installed *
MONO - Open
J33 External speaker
Pin 1 - Speaker
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - +5 volts DC
J34 Keylock / Power LED
Pin 1 - Power LED signal
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Keyboard lock signal
Pin 5 - Ground
W12 Reset switch
Pin 1 - Signal
Pin 2 - Ground
W13 Turbo LED
Pin 1 - Signal
Pin 2 - Ground
W14 Turbo switch
Pin 1 - Signal
Pin 2 - Ground
W8 Flash ROM operation (see note below)
Pins 1-2 Recovery mode
Pins 2-3 Normal operation (default)
DO NOT change jumper W8 unless instructed by a Micronics Technical Support Engineer.
Changing the jumper will result in the Bios being Erased. You must have a Flash
recovery floppy diskette before attempting to recover. The jumper is NOT moved when
updating the Flash ROM.
+=============================+
+ +
+ Cache Configuration +
+ Direct Mapped Write Through +
+ +
+=============================+
W64 W65 W66 W67 W68
64K Cache 1-2 1-2 2-3 2-3 1-2 (9) 8k X8 Sram -20Ns for U202, U203, U204, U205, U206, U207, U208, U209 & U201
128k 2-3 1-2 1-2 1-2 2-3 (5) 32kX8 Sram -20Ns for U202, U203, U204, U205, & U201
256k 2-3 2-3 2-3 2-3 2-3 (9) 32kX8 Sram -20ns for U202, U203, U204, U205, U206, U207, U208, U209 & U201