Chicony CH-881A
Does anyone know where to get jumper settings for Chicony CH-881A?
Patched and tested BIOSes are at http://wims.rainbow-software.org
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-
soupy
- Absentee administrator
- Posts: 1086
- Joined: Thu Mar 21, 2002 1:06 am
- Location: Ontario, Canada
- Contact:
These guys might have a copy they haven't put online yet.
http://motherboards.mbarron.net/table486.htm
http://motherboards.mbarron.net/table486.htm
Flash your BIOS at your own risk.
Thanks 
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
UniFlash - Flash anything anywhere
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 ErrorPatched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
UniFlash - Flash anything anywhere