This document is for the full-sized (13.3" x 12.025") 80486DX-33, 80486DX2-50, and
80486DX2-66 EISA motherboard. The part number for this board is 09-00173-xx.
It's identifying features are: an LED between expansion slots #5 and #6; eight 32-bit
EISA expansion slots; 4 sockets for SIMMs (four banks).
The EISA Slots are numbered 1, 7, 8, 2, 3, 4, 5, & 6. EISA Slots 7,8 are VESA Slots which
support Bus mastering VESA SCSI controllers only.
EISA slots 1 to 6 support EISA Bus mastering controllers.
The Bus clock speed EISA standard is fixed at 8.3MHz.
+=============================+
+ +
+ MOTHERBOARD SWITCH SETTINGS +
+ +
+ * Default setting +
+=============================+
1 Memory size (see below)
2 Memory size (see below)
3 Memory size (see below)
4 Memory size (see below)
5 Memory size (see below)
6 CPU Speed 33Mhz On / 25Mhz Off
7 CPU Speed 33MHZ Off / 25Mhz Off
8 Color video adapter *On
Mono video adapter Off
DIP switch settings for memory size
===================================
Memory Banks DIP Switch 2
---------------------------------------------------
MB 0 1 2 3 S1 S2 S3 S4 S5
---- ---- ---- ---- ---- ---- ---- ---- ---- ----
1MB 256K ON ON ON ON ON
2MB 256K 256K OFF ON ON ON ON
3MB 256K 256K 256K ON OFF ON ON ON
4MB 256K 256K 256K 256K OFF OFF ON ON ON
4MB 1MB ON ON OFF ON ON
5MB 256K 1MB ON ON OFF OFF ON
6MB 256K 256K 1MB ON OFF ON OFF ON
7MB 256K 256K 256K 1MB OFF ON ON OFF ON
8MB 1MB 1MB OFF ON OFF ON ON
9MB 256K 1MB 1MB ON OFF OFF OFF ON
10MB 256K 256K 1MB 1MB OFF OFF ON OFF ON
12MB 1MB 1MB 1MB ON OFF OFF ON ON
13MB 256K 1MB 1MB 1MB OFF OFF OFF OFF ON
16MB 1MB 1MB 1MB 1MB OFF OFF OFF ON ON
16MB 4MB ON ON OFF ON OFF
20MB 1MB 4MB ON ON OFF OFF OFF
24MB 1MB 1MB 4MB ON OFF ON OFF OFF
28MB 1MB 1MB 1MB 4MB OFF ON ON OFF OFF
32MB 4MB 4MB OFF ON OFF ON OFF
36MB 1MB 4MB 4MB ON OFF OFF OFF OFF
40MB 1MB 1MB 4MB 4MB OFF OFF ON OFF OFF
48MB 4MB 4MB 4MB ON OFF OFF ON OFF
52MB 1MB 4MB 4MB 4MB OFF OFF OFF OFF OFF
64MB 4MB 4MB 4MB 4MB OFF OFF OFF ON OFF
In the table above, 256K indicates that (1) 256Kx36 SIMM is installed in the bank,
1MB indicates that (1) 1Mx36 SIMM is installed in the bank, and 4MB indicates that
4Mx36 SIMM is installed in the bank. 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 memory brands:
Toshiba, Siemens, Mitsubishi, NEC
+=============================+
+ +
+ MOTHERBOARD JUMPER SETTINGS +
+ +
+=============================+
J1 Keyboard connector
Pin 1 - Keyboard clock
Pin 2 - Keyboard data
Pin 3 - no connector
Pin 4 - Ground
Pin 5 - +5 volts DC
J17 External 6-volt battery connector
Pin 1 - Battery Positive
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Ground
J22 External speaker
Pin 1 - Speaker
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - +5 volts DC
J23 Keylock / Power LED
Pin 1 - Power LED signal
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Keyboard lock signal
Pin 5 - Ground
W5 Reset switch
Pin 1 - Signal
Pin 2 - Ground
W6 Turbo switch
Pin 1 - Signal
Pin 2 - Ground
W7 Turbo LED
Pin 1 - Signal
Pin 2 - Ground
J62 Floppy Controller IRQ 6, DMA CH 2, I/O 3F0-3F7H {AUTO DISABLE}
J30 IDE Interface IRQ 14, I/O 1F0-1F7h {AUTO DISABLE}
W36 IDE Hard Drive LED
1 - Signal
2 - GND
3 - GND
4 - Signal
J63 Serial A 16450 UART IRQ 4 COM 1 or COM3
J64 Serial B 16450 UART IRQ 3 COM 2 or COM4
{ A 16550 UART is present only if the Super I/O Chip is National PC87312 }
J16 Parallel Port connector IRQ 7, @3BCh or @378h
W16 Printer Port mode
Pin 2-3 - Output Mode
Pin 1-2 - Input Mode {scanner}
CPU Clock Speed W54 W55 SW2 #6 SW2 #7
25Mhz ON ON OFF OFF
33Mhz ON OFF ON OFF
PQFP i486SX ZIF Socket W50 W66 W67
Surface Mounted
None i486SX 1-2 2-3 3-4
None i486DX /DX2 2-3 1-2 & 3-4 1-2
i486SX None 1-2 2-3 3-4
i486SX i487SX 1-2 1-2 & 3-4 3-4
i486SX i486DX /DX2 2-3 1-2 & 3-4 1-2
i486SX OverDRIVE 1-2 1-2 & 3-4 2-3
W68 When Local Bus Master Controllers are installed {VL SCSI},
jumper W68 must be placed on Pins 1-2 to support local bus DMA.
Default 2-3
W69 Write protect Flash BIOS programing : W69 - open
Update Flash BIOS Programming : W69 - installed
W65 BIOS Recovery {DO NOT MOVE ! Removing this jumper will erase the BIOS !}
Cache configuration
Direct Mapped Write Through
============================
Cache W20 W21 W52 W44
----------------------------
64K N/C N/C N/C 2-3
256K 1-2 1-2 1-2 1-2
N/C = Not Connected