This document is for the XCP Mini-sized (9.5" x 8.5") ISA-Bus motherboard. The part number for this board is 09-00164-xx. It's identifying features are: an LED at the end of expansion slots #7 ; six 16-bit expansion slots; one 8-bit expansion slot; four sockets for SIMMs; a socket for an OverDrive CPU 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 and the 486DX50 requires 1/6 bus clock speed. 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 JUMPER SETTINGS + + + +=============================+ J18 External speaker Pin 1 - Speaker Pin 2 - no connector Pin 3 - Ground Pin 4 - +5 volts DC J19 Keylock / Power LED Pin 1 - Power LED signal Pin 2 - no connector Pin 3 - Ground Pin 4 - Keyboard lock signal Pin 5 - Ground W12 CPU selection Pins 1-2 i487SX , Overdrive SX Pins 2-3 i486SX, i486DX, i486DX2 W13 Reset switch Pin 1 - Signal Pin 2 - Ground W14 Turbo LED Pin 1 - Signal Pin 2 - Ground W15 Turbo switch Pin 1 - Signal Pin 2 - Ground W1 Clearing CMOS Setup Temporarily install jumper to Pins 2-3, normal settings are 1-2 W3 Color / Monochrome Display COLOR - Installed * MONO - Open +==========================+ + + + Cache Configuration + + + +==========================+ W7 W9 W10 W17 W18 64K Cache 2-3 1-2 2-3 1-2 1-2 (9) 8k X8 Sram -20Ns for U1, U2, U9, U10, U16, U17, U18, U19 & U45 128k 1-2 2-3 1-2 2-3 1-2 (5) 32kX8 Sram -20Ns for U1, U2, U9, U10 & U45 256k 2-3 2-3 2-3 2-3 2-3 (9) 32kX8 Sram -20ns for U1, U2, U9, U10, U16, U17, U18, U19 & U45 +==========================+ + + + Additional Information + + + +==========================+ The Mini 486 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.