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UM4980 V1.1 486 VESA Motherboard

        - BIOS ID string  UM4980 v1.1  01/12/94--2C4X6H01-00

        - the optional 41 page ver:1.1 PDF manual is available as a 1.1meg archive.
        - the optional 46 page ver:2.1 GIF manual is available as a 2.1meg archive.
          In securing these manuals certain expenses were paid and in
          an effort to recover these fees its only available by donation.

        - 4-72 pin SIMM slots  (1-64meg FPM DRAM)
        - 3-32bit VESA Local Bus slots
        - 7-16bit ISA slots
        - 1-8bit XT slot
        - 128k-1024k CACHE support in 8-32pin sockets + 1 TAG RAM socket
        - PHOENIX Bios Ver:4.03 Auto-Detect Flash Bios with Energy Mgmt.
        - Supports LBA Mode Control + Large Disk DOS Compatibility.
        - Green PC Connector
        - external 3.6v battery not included
        - UMC UM8498F chipset
        - Supports 3.3v/3.45v/5volt CPU's and clock speeds 2x/3x.
        - One 237 ZIF CPU socket 3 which supports these processors:
          INTEL 80486SX/SX2,80486DX/DX2/DX4,P24D
          CYRIX CX486S(M6),CX486DX/DX2(M7)
          AMD AM486DX/DX2,AM486DXL/DXL2
          UMC GREEN CPU U5S-SUPER
        - Supports speeds of 25/33/40/50/66/75/100(internal)MHz.
        - Manufactured by: ELITEGROUP COMPUTER SYSTEMS
        - WEBSITE http://www.ecsusa.com
       
===========================================================================

External Battery        J2              Reset Switch            J30
Green PC connector      J27             Turbo Switch            J31
Speaker                 J29             Turbo LED               J28
Power LED + keylock     J32             32bit VESA slots        SL1-SL3

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

Battery                 J2
----------------------------
Rechargeable            2-3
Clear CMOS              3-4    (short for 3-4secs only with power off)
External           installed  (pin1 VDD 3.6volt lithium, pin4 ground)
                           (battery pack available at most stores)
=======================================================================

BIOS Select             JP1
----------------------------
 EPROM                  open
 5v Flash               1-2
 12v Flash              2-3

Keyboard Select JP3
----------------------------
 external               open
 internal               closed

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

VESA Bus Wait State     JP26   
-----------------------------  
   0 W/S        25MHZ   OPEN   
   1 W/S        33MHZ   CLOSED 

-----------------------------------------------------------------------
                            DRAM CONFIGURATION
-----------------------------------------------------------------------
Size       Bank 0           Bank 1           Bank 2           Bank 3
-----------------------------------------------------------------------
1MB      (1) 256Kx36        NONE             NONE             NONE
2MB      (1) 256Kx36      (1) 256Kx36        NONE             NONE
2MB        NONE             NONE             NONE           (1) 512Kx36
3MB      (1) 256Kx36      (1) 256Kx36      (1) 256Kx36        NONE
4MB      (1) 256Kx36      (1) 256Kx36      (1) 256Kx36      (1) 256Kx36
4MB        NONE             NONE           (1) 512Kx36      (1) 512Kx36
4MB      (1) 1Mx36          NONE             NONE             NONE
5MB      (1) 1Mx36        (1) 256Kx36        NONE             NONE
6MB      (1) 1Mx36        (1) 256Kx36      (1) 256Kx36        NONE
7MB      (1) 1Mx36        (1) 256Kx36      (1) 256Kx36      (1) 256Kx36
8MB      (1) 1Mx36        (1) 1Mx36          NONE             NONE
8MB        NONE             NONE             NONE           (1) 2Mx36
9MB      (1) 1Mx36        (1) 1Mx36        (1) 256Kx36        NONE
1OMB     (1) 1Mx36        (1) 1Mx36        (1) 256Kx36      (1) 256Kx36
12MB     (1) 1Mx36        (1) 1Mx36        (1) 1Mx36          NONE
13MB     (1) 1Mx36        (1) 1Mx36        (1) 1Mx36        (1) 256Kx36
16MB     (1) 1Mx36        (1) 1Mx36        (1) 1Mx36        (1) 1Mx36
16MB       NONE             NONE           (1) 2Mx36        (1) 2Mx36
16MB     (1) 4Mx36          NONE             NONE             NONE
17MB     (1) 4Mx36        (1) 256Kx36        NONE             NONE
18MB     (1) 4Mx36        (1) 256Kx36      (1) 256Kx36        NONE
19MB     (1) 4Mx36        (1) 256Kx36      (1) 256Kx36      (1) 256Kx36
20MB     (1) 4Mx36        (1) 1Mx36          NONE             NONE
21MB     (1) 4Mx36        (1) 1Mx36        (1) 256Kx36        NONE
22MB     (1) 4Mx36        (1) 1Mx36        (1) 256Kx36      (1) 256Kx36
24MB     (1) 4Mx36        (1) 1Mx36        (1) 1Mx36          NONE
25MB     (1) 4Mx36        (1) 1Mx36        (1) 1Mx36        (1) 256Kx36
28MB     (1) 4Mx36        (1) 1Mx36        (1) 1Mx36        (1) 1Mx36
32MB     (1) 4Mx36        (1) 4Mx36          NONE             NONE
33MB     (1) 4Mx36        (1) 4Mx36        (1) 256Kx36        NONE
34MB     (1) 4Mx36        (1) 4Mx36        (1) 256Kx36      (1) 256Kx36
36MB     (1) 4Mx36        (1) 4Mx36        (1) 1Mx36         NONE
37MB     (1) 4Mx36        (1) 4Mx36        (1) 1Mx36        (1) 256Kx36
40MB     (1) 4Mx36        (1) 4Mx36        (1) 1Mx36        (1) 1Mx36
48MB     (1) 4Mx36        (1) 4Mx36        (1) 4Mx36          NONE
49MB     (1) 4Mx36        (1) 4Mx36        (1) 4Mx36        (1) 256Kx36
52MB     (1) 4Mx36        (1) 4Mx36        (1) 4Mx36        (1) 1Mx36
64MB     (1) 4Mx36        (1) 4Mx36        (1) 4Mx36        (1) 4Mx36

This board only supports double density simms (8meg) in Banks 2 + 3.
An 8meg 72 pin FPM simm module is defined as: (1) 2Mx36
=======================================================================

CPU Selector    JP14    JP15            JP16    JP17    JP18            JP19
-------------------------------------------------------------------------
80486SX/SX2     open    2-3             open    open    2-3             open
80486DX/DX2     open  1-2,3-4           1-2     open    2-3             open
80486DX2 (WB) 1-2,3-4 1-2,3-4           1-2   3-4,5-6   1-2,4-5       1-2,4-5
80486DX4      1-2,3-4 1-2,3-4           1-2     5-6     1-2             1-2
AM486DXL        open  1-2,3-4         1-2,3-4   1-2     2-3             2-3
AM486DX         open  1-2,3-4           1-2     open    2-3             open
AM486DXL2       open  1-2,3-4         1-2,3-4   1-2     2-3             2-3
AM486DX2        open  1-2,3-4           1-2     open    2-3             open
CX486S        2-3,4-5   2-3             open  2-3,4-5   1-2,3-4,5-6  1-2,3-4,5-6
CX486DX/DX2     2-3   1-2,3-4           1-2   2-3,4-5   1-2,3-4,5-6  1-2,3-4
SL80486SX/SX2 1-2,3-4   2-3             open    5-6     1-2             1-2
SL80486DX/DX2 1-2,3-4 1-2,3-4           1-2     5-6     1-2             1-2
UMC U5S         open    2-3             3-4     1-2     2-3             2-3

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

CPU Speed       JP7     JP8     JP9             JP25 (Bus Speed)
-----------------------------------------------------
25MHZ           closed  open    open            open
33MHZ           closed  closed  closed          open
40MHZ           closed closed   open            closed
50iMHZ          closed  open    open            closed
50MHZ           open    open    closed          closed
66iMHZ          closed  closed  closed          closed
75iMHZ          closed open     open            closed
100iMHZ         closed  closed  closed          closed

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

80486DX4 CPU Speed      JP24
-----------------------------
        2x              2-3
        3x              open

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

CPU Voltage     JP20    JP21    JP22
-------------------------------------
    3.3V        2-3     2-3     2-3
    3.45V       2-3     2-3     1-2
    5V          1-2     1-2     open

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

Cache           Bank 0          Bank 1          TAG
---------------------------------------------------------
128K            4 - 32kx8       none            1 - 8kx8
256K            4 - 64kx8       none            1 - 32kx8
256K            4 - 32kx8       4 - 32kx8       1 - 32kx8
512K            4 - 64kx8       4 - 64kx8       1 - 32kx8
512K            4 - 128kx8      none            1 - 32kx8
1024K           4 - 128kx8      4 - 128kx8      1 - 64kx8


Cache   JP4     JP5     JP6     JP10    JP11    JP12    JP13
-------------------------------------------------------------
128K    1-2     1-2     open    open    open    open    open
256K    1-2     1-2     1-2     open    open    open    closed
256K    2-3     2-3     open    open    open    open    closed
512K    2-3     2-3     2-3     open    closed  open    closed
512K    1-2     2-3     2-3     1-2     closed  open    closed
1024K   2-3     2-3     2-3     2-3     closed  closed  closed

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

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