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