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