Chicony CH-881A

Request help finding jumper settings or a motherboard manual.
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Rainbow
The UniFlasher
Posts: 3122
Joined: Wed Mar 20, 2002 4:16 pm
Location: Slovakia
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Does anyone know where to get jumper settings for Chicony CH-881A?
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
soupy
Absentee administrator
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Joined: Thu Mar 21, 2002 1:06 am
Location: Ontario, Canada
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These guys might have a copy they haven't put online yet.

http://motherboards.mbarron.net/table486.htm
Flash your BIOS at your own risk.
edwin
The Hardware Archivist
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Joined: Wed Mar 20, 2002 7:11 pm
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That is odd, I just posted these at motherboards.org 8O

However, check your @wimsbios email
edwin/evasive

Do not assume anything

System error, strike any user to continue...
Rainbow
The UniFlasher
Posts: 3122
Joined: Wed Mar 20, 2002 4:16 pm
Location: Slovakia
Contact:

Thanks :D
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
ajzchips
El cheapo dude
Posts: 3048
Joined: Sat Mar 23, 2002 12:41 pm
Location: Madrid, Spain

Can the jumper settings be put online somewhere?
Rainbow
The UniFlasher
Posts: 3122
Joined: Wed Mar 20, 2002 4:16 pm
Location: Slovakia
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From edwin's email:

Code: Select all

CHICONY CH-881A 486 VESA Motherboard
        - BIOS ID string  07/07/95-UMC-881/886-2A4X5C24-01
        - 4-72 pin SIMM slots (2Mb to 256MB)
        - 3-32-bit PCI slots
        - 2-32-bit VESA Local Bus slots
        - 5-16-bit ISA slots
        - 64k-1024k CACHE support in 8-32pin sockets + 1 TAG RAM socket
        - AMI BIOS with WinBIOS setup incl power saving, virus protect and security.
        - Supports IDE LBA/Block mode and 32-bit transfers.
        - Green PC Connector
        - UMC 8881, 8886 chipset
        - Supports 5v/3.3v CPUs* (5, 3.15, 3.3, 3.45, 3.6)
        - ZIF CPU socket which supports these processors:
          INTEL 80486SX/DX/DX2, SL80486SX/DX/DX2/DX4, P24T/P24D. 
          CYRIX CX486S,CX486DX/DX2
          AMD AM486DX/DX2/DXL/DX2L
          UMC U5S
        - Supports CPU core speeds of 20/25/33/40/50 MHz.
        - Manufactured by: CHICONY INC.
 
* Optional 3.3v support is provided by Q2 or Q3 - if it is inserted then the support is available via jumper settings.
 
Connectors
J1        Keyboard
J2        Power Supply
J3         Hardware reset
        1        Ground        
        2        Reset
J4        Turbo Switch
        1        Ground
        2        Turbo Active
J5        Turbo LED
        1        LED cathode
        2        LED power
J6        Speaker connector
        1        Data out
        2        NC
        3        Ground
        4        +5v DC
J7        Keylock and power LED connector
        1        LED power
        2        NC
        3        Ground
        4        Keyboard (sic)
        5        Ground
J8        Power saving switch connector
        Open        Normal
        Short        Power down
J9        Dark Green function connector
        1        Control signal to power supply
        2        Ground
 
A1 Cache SRAM selection
-----------------------
Cache       ____Cache RAM__     TAG RAM       Jumpers_____________________________________
Size        Bank 0   Bank 1        U17        JP3   JP4    JP5    JP7    JP8   JP9    JP10
64KB        8Kx8     8Kx8        8Kx8         1-2   Open   Open   Open   2-3   Open   Open        
128Kb       32Kx8                8Kx8         2-3   Open   1-2    Open   2-3   Short  Open        
256Kb       32Kx8    32Kx8       16Kx8        1-2   Open   2-3    Short  2-3   Short  Open
                                 or 32Kx8
256Kb       64Kx8                16Kx8        2-3   Open   2-3    Short  1-2   Short  Open
                                 or 32Kx8
512Kb       64Kx8    64Kx8       32Kx8        2-3   1-2    2-3    Short  2-3   Short  Short
512Kb       128Kx8               32Kx8        1-2   Open   2-3    Short  2-3   Short  Short
1024Kb      128Kx8   128Kx8      64Kx8        1-2   2-3    2-3    Short  2-3   Short  Short
                                 or 128Kx8
 
Note:         1. Bank 0 = U1, U3, U4, U5
        2. Bankk 0 (sic) = U8, U12, U13, U14
 
A2 SRAM Speed
-------------
Speed                25Mhz        33Mhz        40Mhz        50Mhz
TAG RAM              25ns         20ns         20ns         20ns
DATA RAM             25ns         25ns         20ns         20ns
 
B CPU Manufacturer Selection
-----------------------------
JP6, 11:        Pin Header 1x3
 
CPU        JP11        JP6
Intel      1-2        1-2
Cyrix      2-3        1-2
AMD/UMC    1-2        2-3
 
C. CPU Power selection
-----------------------
JP29,30,31:        Pin Header 1x3
JP32:              Pin Header 2x4
 
CPU Power        JP29        JP30        JP31        JP32
5v               2-3         2-3         2-3         Don't care
3.15v            1-2         1-2         1-2         1-2
3.3v             1-2         1-2         1-2         3-4
3.45v            1-2         1-2         1-2         5-6
3.6v             1-2         1-2         1-2         7-8
 
D. CPU Clock Selection
----------------------
JP47, 48, 49:        Pin Header 1x3
 
Frequency        JP47        JP48        JP49        CPU Type
20Mhz            1-2         1-2         1-2         486DX/SX-20,Cx486S2/DX2-40
25Mhz            1-2         1-2         2-3         486DX/SX-25,Cx486S/DX-25
                                                     486DX2-50/Cx486DX2-50
                                                     487SX-25
33Mhz            2-3         2-3         2-3         486DX/SX-33
                                                     486DX2-66, Cx486DX2-66
                                                     486DX4-100,487SX-33
40Mhz            1-2         2-3         2-3         486DX/SX-40,Cx486S/DX-40
50Mhz            2-3         1-2         1-2         486DX-50,Cx486DX-50
 
Note: See also JP25 under Other, below.
 
E.  CPU Type selection
----------------------
CPU     486SX   486DX     SL486SX   SL486DX   Cx486S   Cx486DX  UMC U5S  Am486DXL   P24D     P24T
                486DX2              SL486DX2           Cx486DX2          Am486DXL2
                                    SL486DX4
JP18    Open    Open      1-2       1-2       2-3      2-3      Open     Open       1-2      1-2
JP19    1-2     1-2       3-4       3-4       3-4      3-4      1-2      1-2        3-4      3-4,5-6
JP20    2-3     1-2,3-4   2-3       1-2,3-4   2-3      1-2,3-4  2-3      1-2,3-4    1-2,3-4  1-2,3-4
JP21    Open    Open      2-3,4-5   2-3,4-5   1-2,3-4  1-2,3-4  Open     Open       2-3,4-5  2-3,4-5
JP22    Open    Open      Open      Open      2-3      2-3      3-4      3-4        Open     2-3
JP23    Open    3-4       Open      3-4       Open     3-4      1-2,3-4  1-2,3-4    3-4      2-3
JP24    Open    Open      1-2       1-2       1-2      1-2      2-3      2-3        1-2      1-2
JP26    2-3     2-3       2-3       2-3       1-2      1-2      2-3      2-3        2-3      2-3
JP27    Open    Open      Open      Open      1-2      1-2      Open     Open       Open     2-3
JP28    Open    Open      Open      Open      2-3      2-3      Open     Open       Open     1-2
 
Note 1:        
JP43                 P24D         1-2
                     All other    Open
 
JP44, 45, 46         P24D         Short
                     All other    Open
 
Note 2: See also JP25 under Other, below.
 
F. VESA Local Bus ID Selection
------------------------------
JP41, 42:        Pin Header 1x2
Wait State Selection        JP41
High speed 0-wait        Open
High speed 1-wait        Short
 
VL Bus operation clock                                JP42
VESA clock and CPU clock > 33Mhz (JP47,48,49)         Short
VESA clock and CPU clock <= 33Mhz (JP47,48,49)        Open
 
G. Memory Parity / VESA Master Mode Selection
---------------------------------------------
JP12, 14, 15, 17:         Pin Header 1x3
Parity   VESA Bus       JP12       JP14       JP15       JP16       JP17
Enable   Slave Mode     1-2        1-2        1-2        1-2        1-2
Disable  Master Mode    2-3        2-3        2-3        2-3        2-3
 
H. Other
--------
JP1:        Pin Header 1x2
            Short: CMOS clear        Open: Normal operation
JP2:        Pin Header 1x3
            1-2  Flash ROM 27010        2-3  EPROM 27010
JP25:       Pin Header 1x3
            1-2  CPU running at 2.5 x clock
            2-3  CPU running at 2 x clock
            Open CPU running at 3 x clock
JP33:       Pin header 1x2
            Short:  Enable VESA bus write-back
            Open:   Disable VESA bus write-back
 
                                
RAM Configuration summary
Slot usage
SIM 1
SIM 1 + SIM 2 (same type)
SIM 1 + SIM 2 (same type), SIM 3
SIM 1 + SIM 2 (same type), SIM 3 + SIM 4 (same type)
 
SIMM Options
SIMM               Size        SIM 1, SIM 2      SIM 3, SIM 4
256K x 36-S*        1Mb         both only         3 or both
512K x 36-D*        2Mb         1 or both         3 or both
1M x 36-S           4Mb         1 or both         3 or both
2M x 36-D           8Mb         1 or both         3 or both
4M x 36-S          16Mb         1 or both         3 or both
8M x 36-D          32Mb         1 or both         3 or both
16M x 36-S         64Mb         1 or both         3 or both
 
Note:        -S Single sided         -D Double sided
 
* Usage in SIM 3, SIM 4 may be restricted. The table lists these 
for SIM 3, SIM 4 only with 16M x 36-S in Sim 1, SIM 2.
 
Dark Green Function Support
===========================
For SMI Green (Intel SL enhanced/Cyrix) CPU
Dark Green Power Down Sequence
Mode        CPUCLK Clock Status        Peripheral Device Status
Normal      CPUCLK = CPUCLK            Normal Mode
Doze        CPUCLK = CPUCLK / 2        Normal Mode
Standby     CPUCLK = CPUCLK / 4        HDD Standby
                                       CRT Standby
Suspend     CPUCLK = 0 Mhz             J9  Output low states
                                       HDD Standby
                                       CRT Standby
 
For Non-SMI Green (Intel DX/SX, MAD, UMC) CPU
Mode        CPUCLK Clock Status        Peripheral Device Status
Normal      CPUCLK = CPUCLK            Normal Mode
Doze        CPUCLK = 20 Mhz            Normal Mode
Standby     CPUCLK = 8Mhz              HDD Standby
                                       CRT Standby
Suspend     CPUCLK = 8 Mhz             J9  Output low states
                                       HDD Standby
                                       CRT Standby
 
POST Beeps 
(Untested - from  Post Code Master, 
                  Microsystems Develoment Inc
                  4100 Moorpark Ave., Suite 104
                  San Jose, CA      95117   USA)
Beeps    Error
1        DRAM Refresh Failure
2        Parity error in first 64K RAM
3        Base 64K RAM failure
4        System Timer #1 failure
5        Processor failure 
6        Keyboard Controller / Gate A20 error
7        Virtual Mode exception error
8        Display Memory read/write failure (Non-fatal)
9        ROM BIOS Checksum (32KB at F800:0) Failed
10       CMOS Shutdown Register Read/Write Error
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
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