MICRONICS MOTHERBOARD

80486xx XCP ISA (Mini size 09-00164-xx)

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.