MICRONICS VCP 80486xx MOTHERBOARD (09-00144)


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This document is for the baby-sized (13.3" x 8.5") Gemini VL-Bus motherboard.

The part number for this board is 09-00144-xx. It is also known as VCP.

It's identifying features are: an LED between expansion slots #5 and #6; six 16-bit

expansion slots; two 16-bit/VL-Bus expansion slots; four sockets for SIMMs; a socket

for an OverDrive CPU; two IDE interface connectors; one floppy connector; two serial

port connectors; one parallel port connector.

The ISA bus speed for this motherboard is fixed at 8MHz. The VL-Bus 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.


PROCESSOR UPGRADE REPORT

AMD 5x86-133

1. <jhframe@dcn.davis.ca.us> Jim Frame has reported that he successfully upgraded the 09-00144-A1 MB with the

Kingston 5x86-133 upgrade. This upgrade consists of a 3.3V regulator and the AMD 5x86-133 chip and ball bearing fan.

"Plug and Play" install with no BIOS changes and no CMOS changes. Remove DX-33, install upgrade chip/regulator,

plug in fan and power it up.

2. <kmassner@srminc.com> Keith Massner has successfully upgraded the 09-00144 MB with the Gainberry 586-75 and 586-133 processors. The BIOS revision was GLB05.

Intel ODPRDX4/100

<oneillj@ncr.disa.mil> Jim Oneil has reported that he successfully upgraded the 09-00144-xx to the Intel DX4-100 processor with

the internal voltage regulator (DX4ODPR-100). The BIOS had previously been upgraded to allow IDE drives >528MB. It is

not known if the BIOS upgrade is required to allow the DX4 upgrade. Jim removed the DX2/66 and plugged in the DX4-100

with no changes to BIOS or switch settings.


+ +

+ MOTHERBOARD SWITCH SETTINGS +

+ +

+ * = Default setting +

+=============================+

SW1

---

1 Memory size (see below)

2 Memory size (see below)

3 Memory size (see below)

4 Memory size (see below)

5 CPU selection (see below)

6 CPU selection (see below)

7 CPU selection (see below)

8 CPU selection (see below)

DIP switch settings for memory size


Memory Banks DIP Switch 1

-----------------------------------------------

MB 0 1 2 3 S1 S2 S3 S4

---- ---- ---- ---- ---- ---- ---- ---- ----

4MB 4M ON ON ON ON

8MB 4M 4M OFF ON ON ON

12MB 4M 4M 4M ON OFF ON ON

16MB 4M 4M 4M 4M OFF OFF ON ON

16MB 16M ON ON OFF ON

20MB 4M 16M ON ON OFF OFF

24MB 4M 4M 16M ON OFF ON OFF

28MB 4M 4M 4M 16M OFF ON ON OFF

32MB 16M 16M OFF ON OFF ON

36MB 4M 16M 16M ON OFF OFF OFF

40MB 4M 4M 16M 16M OFF OFF ON OFF

48MB 16M 16M 16M ON OFF OFF ON

52MB 4M 16M 16M 16M OFF OFF OFF OFF

64MB 16M 16M 16M 16M OFF OFF OFF ON

In the table above, 4M indicates that one 1Mx36 SIMM is installed in the socket,

16M indicates that one 4Mx36 SIMM is installed in the socket. The above shows all

of the possible memory configurations.

When installing more than 16MB of memory, BIOS relocation must be disabled. Bios

relocation copies the video Bios (C0000-C7FFF) and the system ROM Bios (F0000-FFFFF) into

RAM. The motherboard adds 15MB to these addresses (F00000) to be able to differentiate

between the ROM and RAM. Enabling the relocation feature causes the memory above 16MB

to become non-contiguous and therefore inaccessible.

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


DIP switch settings for CPU selection

=====================================

DIP Switch 1

---------------------

CPU Speed S5 S6 S7 S8

--------------------------------------

33MHz or 66MHz Off On Off Off

25MHz or 50MHz On Off On Off


+ +

+ MOTHERBOARD JUMPER SETTINGS +

+ +

+=============================+

J11 Com Port A

J12 Parallel Port

J14 Com Port B

J15 Floppy connector

J16 Primary IDE connector

J24 External 6-volt battery connector

Pin 1 - Battery Positive

Pin 2 - no connector

Pin 3 - Ground

Pin 4 - Ground

J28 External speaker

Pin 1 - Speaker

Pin 2 - no connector

Pin 3 - Ground

Pin 4 - +5 volts DC

J29 Keylock / Power LED

Pin 1 - Power LED signal

Pin 2 - no connector

Pin 3 - Ground

Pin 4 - Keyboard lock signal

Pin 5 - Ground

J30 Secondary IDE connector

W13 CPU selection

Pins 1-2 486DX, 486DX2

Pins 2-3 486SX

W15 Reset switch

Pin 1 - Signal

Pin 2 - Ground

W16 Parallel port I/O direction

Pins 1-2 Input mode

Pins 2-3 Output mode (default)

W17 Turbo LED

Pin 1 - Signal

Pin 2 - Ground

W18 Turbo switch

Pin 1 - Signal

Pin 2 - Ground

W19 IDE LED

Pin 1 - Signal

Pin 2 - Ground

W20 Flash ROM operation (see note below)

Pins 1-2 Recovery

Pins 2-3 Normal operation (default)

DO NOT change jumper W20 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.


+ +

+ Additional Information +

+ +

+==========================+

I/O Port addresses

------------------

COM1 3F8h

COM2 2F8h

COM3 3E8h

COM4 2E8h

LPT1 3BCh

LPT2 378h

LPT3 278h

IRQ list

--------

IRQ 6 Floppy controller

IRQ 14 Primary IDE controller

IRQ 15 Secondary IDE controller

When using the on-board I/O ports, the interrupts used cannot be shared with

another device. IRQ14 and IRQ15 cannot be shared, regardless of whether or

not IDE drives are attached to the on-board connectors.


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