This document is for the baby-sized (13.3" x 8.5") 80386SX-25 caching motherboard. It's identifying features are: an LED between expansion slots #5 and #6; six 16-bit expansion slots; eight sockets for SIMMs (four banks of 2); a socket for an 80387SX coprocessor. The bus speed for this motherboard is fixed at 8MHz. +=============================+ + + + MOTHERBOARD JUMPER SETTINGS + + + +=============================+ J6 COM2 J8 COM1 J9 Parallel port J19 IDE interface J20 Floppy interface J21 Hard disk LED W1 Monitor type Not connected Monochrome video card Pins 1-2 Color video card W2 Reserved Not connected W3 Reserved Not connected W4 CMOS memory Pins 1-2 Battery backed-up CMOS (default) Pins 2-3 Clear CMOS memory W5 Memory type Pins 2-3 4Mx9 SIMMs installed Pins 1-2 and 3-4 4Mx9 SIMMs not installed W6 Reserved Not connected P2 Reset switch Pin 1 - Signal Pin 2 - Ground P3 External speaker Pin 1 - Speaker Pin 2 - no connector Pin 3 - Ground Pin 4 - +5 volts DC P4 Keylock / Power LED Pin 1 - Power LED signal Pin 2 - no connector Pin 3 - Ground Pin 4 - Keyboard lock signal Pin 5 - Ground +========================+ + + + MEMORY CONFIGURATION + + + +========================+ Listed below are the possible memory configurations Size in Bank Bank Bank Bank MB 0 1 2 3 ----------------------------------- 1.0 256K 256K 1.5 256K 256K 256K 2.0 256K 256K 256K 256K 3.0 256K 256K 1MB 4.0 1MB 1MB 6.0 1MB 1MB 1MB 8.0 1MB 1MB 1MB 1MB 9.0 256K 256K 4MB 10.0 1MB 4MB 16.0 4MB 4MB 256K = Two 256Kx9 SIMMs in the bank 1MB = Two 1Mx9 SIMMs in the bank 4MB = Two 4Mx9 SIMMs in the bank