This document is for the full-sized (13.3" x 12.025") 80386-33 caching motherboard. It's identifying features are: an LED between expansion slots #5 and #6; eight 16-bit expansion slots; sixteen sockets for SIMMs (four banks of 4); a socket for a Weitek 3167 or Intel 80387 coprocessor; the Micronics ASIC chipset (four chips); two 9-pin serial port connectors; one 25-pin parallel port connector; one 16-bit IDE connector; one floppy connector. The bus speed for this motherboard is fixed at 8MHz. +=============================+ + + + MOTHERBOARD SWITCH SETTINGS + + + + * = Default setting + +=============================+ SW1 ------------------------------------------ 1 Reserved *On 2 80387 Coprocessor installed On 80387 Coprocessor not installed *Off 3 Reserved Off 4 Bios relocation enabled *On Bios relocation disabled Off 5 Reserved *Off 6 Color video adapter *On Monochrome video adapter Off 7 Cache enabled *On Cache disabled Off 8 Reserved Off SW2 ------------------------------------------ 1 COM1 Enabled (3F8-3FF) *On COM1 Disabled Off 2 COM2 Enabled (2F8-2FF) *On COM2 Disabled Off 3 IDE interface enabled *On IDE interface disabled Off 4 Floppy controller enabled *On Floppy controller disabled Off 5 Primary Floppy address (3F0-3F7) *On Secondary Floppy address (2F0-2F7) Off 6 Parallel port setting (See below) 7 Parallel port setting (See below) 8 Reserved *On Parallel port settings SW2.6 SW2.7 Parallel Port Address IRQ ----- ----- ------------- ------- --- ON ON LPT1 378-37F 7 OFF ON LPT2 278-27F 5 ON OFF LPT1 3B8-3BF 7 OFF OFF Port disabled +=============================+ + + + MOTHERBOARD JUMPER SETTINGS + + + +=============================+ J5 Keylock / Power LED Pin 1 - Power LED signal Pin 2 - no connector Pin 3 - Ground Pin 4 - Keyboard lock signal Pin 5 - Ground J6 External keyboard connector Pin 1 - Keyboard clock Pin 2 - Keyboard data Pin 3 - no connector Pin 4 - Ground Pin 5 - +5 volts DC J8 External speaker Pin 1 - Speaker Pin 2 - no connector Pin 3 - Ground Pin 4 - +5 volts DC J9 External 6-volt battery connector Pin 1 - Battery Positive Pin 2 - no connector Pin 3 - Ground Pin 4 - Ground J60 - Hard drive LED Pin 1 - Signal Pin 2 - Ground Pin 3 - Ground Pin 4 - Signal W1 Reset switch Pin 1 - Signal Pin 2 - Ground W2 Bios size Pin 1-2 512K Pin 2-3 256K (default) W4 Turbo LED Pin 1 - Signal Pin 2 - Ground W5 Turbo switch Pin 1 - Signal Pin 2 - Ground W9 Non-cacheable region Pin 1-2 D00000-DFFFFF No connection E00000-EFFFFF W10 Base memory size Pin 1-2 512KB No connection 640KB (default) W14 Cache configuration Pin 1-2 Direct map (32KB) No connection Two-way set associative (64KB) W15 Cache configuration Pin 1-2 Direct map (32KB) Pin 2-3 Two-way set associative (64KB) W20 Reserved No connection W500 Memory configuration Pin 1-2 256Kx9 SIMMs in Bank 0 Pin 2-3 1Mx9 SIMMs in Bank 0 W501 Video BIOS cache No connection Video BIOS non-cacheable Pin 1-2 Video BIOS cacheable W510 Memory configuration Pin 1-2 256Kx9 SIMMs in Bank 1 Pin 2-3 1Mx9 SIMMs in Bank 1 W603 Reserved Not installed W604 Reserved Pin 1-2 A note on the Serial port connectors: ===================================== There are two common pin-outs for 9-pin serial connectors. It is important to use the cables supplied with this board. If you do not have these original cables, make sure the cable is configured as follows: Motherboard DB-9 1 6 --------------- 2 7 \ 1 2 3 4 5 / 3 8 \ 6 7 8 9 / 4 9 --------- 5 . The tenth pin is normally removed from the motherboard connector.