This document is for the baby-sized (13.3" x 8.5") MX30 VL-Bus motherboard.
The part number for this board is 09-00165-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 sockets for SIMMs; a ZIF socket
for an OverDrive CPU.
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 +
+ +
+======================================+
Jumper settings for CPU selection
=====================================
----------------------
CPU Speed W20 W21
-------------------------------------------
33MHz or DX2/ 66MHz 1-2 2-3
25MHz or DX2/ 50MHz 2-3 2-3
CPU selection
PQFP Surface mounted 486SX OVERDRIVE ZIF SOCKET W22 W23 W24
i486SX NONE 1-2 1-2 1-2
i486SX i486DX/DX2 2-3 2-3 2-3
i486SX OVERDRIVE 2-3 2-3 1-2
NONE i486SX 1-2 1-2 1-2
NONE (UNIVERSAL) i486DX/DX2 2-3 2-3 2-3
W3 When Local Bus Master controllers are installed {VL SCSI},
jumper W3 must be removed to support local bus DMA.
W14 Local Bus Wait State
0-Wait state : 1-2 * default
1-wait state : 2-3
W4 Clearing CMOS Setup
Temporarily install jumper, normal settings are open.
The MX30 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 - OPEN *
MONO - INSTALLED
J24 External speaker
Pin 1 - Speaker
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - +5 volts DC
J28 Keylock / Power LED
Pin 1 - Power LED signal
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Keyboard lock signal
Pin 5 - Ground
W25 Reset switch
Pin 1 - Signal
Pin 2 - Ground
W27 Turbo LED
Pin 1 - Signal
Pin 2 - Ground
W26 Turbo switch
Pin 1 - Signal
Pin 2 - Ground
+=============================+
+ +
+ Cache Configuration +
+ Direct Mapped Write Through +
+ +
+=============================+
W8 W11 W13 W18 W19
64K Cache 2-3 2-3 1-2 1-2 1-2 (9) 8k X8 Sram -20Ns for U36-U39, U43-U46 & U41
128k 1-2 1-2 2-3 2-3 1-2 (5) 32kX8 Sram -20Ns for U36-U39, & U41
256k 2-3 2-3 2-3 2-3 2-3 (9) 32kX8 Sram -20ns for U36-U39, U43-U46 & U41