This document is for the baby-sized (13.3" x 8.5") 486V VL-Bus motherboard.
The part number for this board is 09-00169-xx.
It's identifying features are: an LED between expansion slots #5 and #6; eight 16-bit
expansion slots; two 16-bit/VL-Bus expansion slots; four sockets for 72 pin SIMMs; a ZIF socket
for a 486 or Pentium OverDrive CPU; one external cache socket (SL3). Two IDE interface connectors; one floppy connector;
two serial port connectors; one parallel port connector. AT (DIN) style keyboatd connector. 8 position DIP switch (SW8)
located to the right of the ZIF socket.
The VESA Local 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. A 50 MHZ CLK is not yet a current VESA standard specification
The ISA bus speed for this motherboard is set at 8.33MHz. The CPU clock speed is
determined by Sw-8 5 thru 8.
The following shows all of the possible memory configurations.
<jtob@desupernet.net> Jim O'brien has successfully upgraded this MB with the Cyrix 586-100 purchased from Ben Myers at
benmyers@ultranet.com He removed the 486 CPU from the PGA socket and installed the upgrade in the ZIF socket.
Returns a Norton benchmark equivalent to a Pentium 75. The BIOS was upgraded using the Microfirmware M4GS25 revision prior
to the CPU upgrade. Per Ben Myers, the MFI BIOS is a MUST for it to recognize the Cyrix CPU correctly.
Boot halts will occur without the MFI BIOS.
MEMORY CHART CONFIGURATION
DIP switch settings for memory size.
Sw8-1 Sw8-2 Sw8-3 Sw8-4
4MB On On On On
8MB Off On On On
12MB On Off On On
16MB Off Off On On
16MB On On Off On
20MB On On Off Off
24MB On Off On Off
28MB Off On On Off
32MB Off On Off On
36MB On Off Off Off
40MB Off Off On Off
48MB On Off Off On
52MB Off Off Off Off
64MB Off Off Off On
===================================
Memory Banks 36 bit parity SIMM's.
----------------------------
MB 0 1 2 3
---- ---- ---- ---- ----
4MB 1 x 36
8MB 1 x 36 1 x 36
12MB 1 x 36 1 x 36 1 x 36
16MB 1 x 36 1 x 36 1 x 36 1 x 36
16MB 4 x 36
20MB 1 x 36 4 x 36
24MB 1 x 36 1 x 36 4 x 36
28MB 1 x 36 1 x 36 1 x 36 4 x 36
32MB 4 x 36 4 x 26
36MB 1 x 36 4 x 36 4 x 36
40MB 1 x 36 1 x 36 4 x 36 4 x 36
48MB 4 x 26 4 x 36 4 x 36
52MB 1 x 36 4 x 36 4 x 36 4 x 36
64MB 4 x 36 4 x 36 4 x 36 4 x 36
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 SWITCH & JUMPER SETTINGS +
+ +
+======================================+
DIP switch settings for CPU selection
=====================================
DIP Switch 8
----------------------
CPU Speed sw8- Sw8-6 Sw8-7 Sw8-8
-------------------------------------------
25 MHZ OFF OFF ON OFF
33 MHZ OFF ON OFF OFF
50I MHZ OFF OFF ON OFF
66IMHZ OFF ON OFF OFF
W22 1-2 CPU type = 486DX/DX2
W22 2-3 CPU type = Pentium overdrive.
W23 1-2 CPU type = 486SX (DO NOT INSTALL IN ZIF socket.
W23 2-3 CPU type = non 486SX
J11 Serial 16550 Port A National Semiconductor Super i/o PC87312
J12 Parallel Printer Port
J14 Serial 16550 Port B National Semiconductor Super i/o PC87312
J15 FDD interface
J16 Primary IDE interface
J24 External battery
The external battery is not required.
The Dallas / Benchmarq Real Time Clock Chip contains an internal battery for an approximate lifetime of 8-10 years.
J 28 Speaker
J 29 Power LED and keylock
J30 Secondary IDE interface
J 36 external keyboard
W15 Reset switch
W17 Turbo LED
W18 Turbo switch
W 19 IDE interface LED
SL1 & SL2 32 bit VESA local bus slots
SL3 External cache card slot. 80 pin. Looks like SIMM connector.
-----------------
COM1 3F8h IRQ 4
COM2 2F8h 3
COM3 3E8h 4
COM4 2E8h 3
LPT1 3BCh 7
LPT2 378h 7
LPT3 278h 7
IRQ in use
--------
IRQ 6 Floppy controller
IRQ 14 Primary IDE controller
W16 1-2 Parallel port unidirectional (printer)
W16 2-3 Parallel port bi directional.
W20 1-2 Flash BIOS write protected
W20 2-3 Flash BIOS write enabled.
+=============================+
+ +
+ Cache Configuration +
+ 80 pin external cache card. (not memory SIMM))
64/128/256KB on external cache card.+
+ +
+=============================+