Jumper Settings

THESE JUMPER SETTINGS ARE FOR AN UNKNOWN CHICONY BOARD.LAYOUT OF THE CH-880C WANTED AS WELL. I DO NOT OWN ONE.

Please email me if you have a CH-880C and are able to give your current settings and CPU type.

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CPU Clock Speed--J1E1, J1E2

J1E1 and J1E2 select the CPU clock speed. These jumpers must be set identically. The settings are:

Pins 1-2 covered: 33 MHz
Pins 2-3 covered: 25 MHz

CPU Type (SX/other)--J1C4

J1C4 must be set appropriately for the type of CPU, depending on whether the CPU is an i486 SX.

Pins 1-2 covered: all CPU types except i486 SX
Pins 2-3 covered: i486 SX CPU

Do not change this jumper unless you have changed out the CPU chip.

CPU Type (SL/Non-SL)--J1C3

J1C3 must be set appropriately for the type of CPU, depending on whether the CPU has SL enhancements.

Pins 1-2 covered: SL-enhanced CPUs
Pins 2-3 covered: non-SL-enhanced CPUs

Do not change this jumper unless you have changed out the CPU chip.

Pentium OverDrive Processor Cache Enabled--J1C2

This jumper configures the processor cache, depending on the CPU type.

Pins 1-2 covered: CPUs other than Pentium OverDrive
Pins 2-3 covered: Pentium OverDrive CPU cache enabled

Do not change this jumper unless you have changed out the CPU chip.

CPU VCC--J2A1, J2A2, J2A3, J2A4

These jumpers must be set appropriately for the Vcc voltage that the CPU expects (5 volts or 3.3 volts). These jumpers must all be set identically.

Pins 1-2 covered: Vcc is 3.3 volts
Pins 2-3 covered: Vcc is 5 volts

Do not change this jumper unless you have changed out the CPU chip.
The wrong voltage will destroy the CPU.

Flash Memory Write Protect--J9E3

This jumper controls whether the BIOS flash memory can be reprogrammed.

Pins 1-2 covered: flash memory can be reprogrammed
Pins 2-3 covered: flash memory is protected

Flash Memory Recovery--J9E4

This jumper allows recovery from a bad or corrupted program in flash memory.

Pins 1-2 covered: normal operation
Pins 2-3 covered: recovery mode

Clear CMOS--J9E1

This jumper controls whether the BIOS uses the existing CMOS Setup values or resets these values to their defaults. The latter mode is useful if the settings become corrupted such that even the Setup program does not run.

Pins 1-2 covered: use the settings in CMOS
Pins 2-3 covered: reset all values in CMOS

Setup Enable--J9E2

This jumper controls whether the CMOS Setup program can be run.

Pins 1-2 covered: users can run Setup. Access to CMOS is allowed
Pins 2-3 covered: Setup is disabled. Access to CMOS is provided

Password Clear--J9D1

This jumper controls whether the BIOS uses the password set in CMOS or clears the password when the system is reset. When using the password, the user must enter the correct password after each system reset in order to enter Setup or have the operating system start up. If clearing the password, the BIOS resets the CMOS values so that no password is set, and the user can then enter Setup or start up the operating system directly.

Pins 1-2 covered: use the password in CMOS
Pins 2-3 covered: clear the password

Color/Monochrome Video--J9D2

This jumper controls the mode video that the BIOS sets when the system is switched on or reset.

Pins 1-2 covered: color video
Pins 2-3 covered: monochrome video

Cache Size--J8A1, J8A2

These jumpers select the size of the memory cache. Both jumpers must be set the same. If no cache is installed, these jumpers have no effect.

Pins 1-2 covered: 256KB cache
Pins 2-3 covered: 128KB cache

Front Panel Connectors

The following tables show the motherboard's connectors for cables to the front panel.

Speaker Connector

Pin Signal Name

1 SPKR DAT

2 Key

3 N.C.

4 +5 (Vcc)

Pin	Signal Name
1	SPKR DAT
2	Key
3	N.C.
4	+5 (Vcc)

Reset Connector

Pin Signal Name

1 RESET

2 Ground

Pin	Signal Name
1	RESET
2	Ground

KeyLock/Power LED Connector

Pin Signal Name

1 LED PWR

2 Key

3 Ground

4 KEY LOCK

5 Ground

Pin	Signal Name
1	LED PWR
2	Key
3	Ground
4	KEY LOCK
5	Ground

Hard Disk LED Connector

Pin Signal Name

1 PULL UP 330

2 HD ACTIVE-

3 Key

4 PULL UP 330

Pin	Signal Name
1	PULL UP 330
2	HD ACTIVE-
3	Key
4	PULL UP 330

Mode LED Connector

Pin Signal Name

1 PULL UP 330

2 LED_TURBO-

Pin	Signal Name
1	PULL UP 330
2	LED_TURBO-

Mode Button Connector

Pin Signal Name

1 TURBO

2 Ground

3 N.C.

Pin	Signal Name
1	TURBO
2	Ground
3	N.C.

Fan Connector

Pin Signal Name

1 Ground

2 +12 V

3 Ground

Pin	Signal Name
1	Ground
2	+12 V
3	Ground

External SMI

Pin Signal Name

1 Ground

2 SMI

Pin	Signal Name
1	Ground
2	SMI

AT-Style Keyboard Connector

Pin Signal Name Pin Signal Name

1<\td> Clock 4 Ground

2 Data 5 Vcc

3 Not Connected

Pin	Signal Name	Pin	Signal Name
1<\td>	Clock	4	Ground
2	Data	5	Vcc
3	Not Connected

Auxiliary (3.3V) Power Connector

Pin Signal Name

1 Ground

2 Ground

3 Ground

4 +3.3 Volts

5 +3.3 Volts

6 +3.3 Volts

Pin	Signal Name
1	Ground
2	Ground
3	Ground
4	+3.3 Volts
5	+3.3 Volts
6	+3.3 Volts

Primary Power Connector

Pin Signal Name

1 Power Good

2 +5 Volts Vcc

3 +12 Volts

4 -12 Volts

5 Ground

6 Ground

7 Ground

8 Ground

9 -5 V

10 +5 Volts (Vcc)

11 +5 Volts (Vcc)

12 +5 Volts (Vcc)

Pin	Signal Name
1	Power Good
2	+5 Volts Vcc
3	+12 Volts
4	-12 Volts
5	Ground
6	Ground
7	Ground
8	Ground
9	-5 V
10	+5 Volts (Vcc)
11	+5 Volts (Vcc)
12	+5 Volts (Vcc)

Memory Configurations

This table summarizes the memory configurations that will work in the system. Use only 70ns JEDEC-standard 72-pin SIMMs. SIMMS can be either 32 bit (non-parity) or 36 bit (parity).

Bank Zero	Bank One	Total
Empty	512 K x 36 (2 M)	2 M
Empty	1 M x 36 (4 M)	4 M
Empty	2 M x 36 (8 M)	8 M
Empty	4 M x 36 (16 M)	16 M
Empty	8 M x 36 (32 M)	32 M
512 K x 36 (2 M)	Empty	2 M
512 K x 36 (2 M)	512 K x 36 (2 M)	4 M
512 K x 36 (2 M)	1 M x 36 (4 M)	6 M
512 K x 36 (2 M)	2 M x 36 (8 M)	10 M
512 K x 36 (2 M)	4M x 36 (16 M)	18 M x 36
512 K x 36 (2 M)	8 M x 36 (32 M)	34 M
1 M x 36 (4 M)	Empty	4 M
1 M x 36 (4 M)	512 K x 36 (2 M)	6 M
1 M x 36 (4 M)	1 M x 36 (4 M)	8 M
1 M x 36 (4 M)	2 M x 36 (8 M)	12 M
1 M x 36 (4 M)	4 M x 36 (16 M)	20 M
1 M x 36 (4 M)	8 M x 36 (32 M)	36 M
2 M x 36 (8 M)	Empty	8 M
2 M x 36 (8 M)	512 K x 36 (2 M)	10 M
2 M x 36 (8 M)	1 M x 36 (4 M)	12 M
2 M x 36 (8 M)	2 M x 36 (8 M)	16 M
2 M x 36 (8 M)	4 M x 36 (16 M)	24 M
2 M x 36 (8 M)	8 M x 36 (32 M)	40 M
4 M x 36 (16 M)	Empty	16 M
4 M x 36 (16 M)	512 K x 36 (2 M)	18 M
4 M x 36 (16 M)	1 M x 36 (4 M)	20 M
4 M x 36 (16 M)	2 M x 36 (8 M)	24 M
4 M x 36 (16 M)	4 M x 36 (16 M)	32 M
4 M x 36 (16 M)	8 M x 36 (32 M)	48 M
8 M x 36 (32 M)	Empty	32 M
8 M x 36 (32 M)	512 K x 36 (2 M)	34 M
8 M x 36 (32 M)	1 M x 36 (4 M)	36 M
8 M x 36 (32 M)	2 M x 36 (8 M)	40 M
8 M x 36 (32 M)	4 M x 36 (16 M)	48 M
8 M x 36 (32 M)	8 M x 36 (32 M)	64 M

Note: The Bank 0 socket is the closest to the power supply.

Installing and Removing SIMMs

SIMM sockets are durable but can be broken. Use care when installing or removing SIMMs from the motherboard. Never force a SIMM into a socket. Use only 70ns JEDEC-standard 72-pin SIMMs.

Begin installation of the SIMMs in the right slot of Bank 1. Be sure that you install the SIMMs in the correct banks, or the SIMMs may not work.

Before you insert the SIMM, orient the notch on the SIMM toward the back of the board. If you try to put the SIMM in backward, a matching flange in the socket will prevent you from installing the SIMM.

Insert the SIMM at a thirty-degree angle to the left. Make sure the SIMM contacts are completely seated in the groove of the socket.
Tilt the SIMM until it is vertical; the socket clicks as it locks the SIMM into place. A correctly installed SIMM stands straight up.

To remove a SIMM:

Push down on the latches on both sides of the SIMM socket. The latches will pop slightly as they release the SIMM.
Tilt the SIMM thirty degrees to the left, then lift the SIMM out of the socket.

Installing Cards and Drives

You can install a variety of options into your system, including expansion cards and disk, CD-ROM, and tape drives. When installing such options, you remove and reinstall the system unit's cover just like you would when installing or removing SIMMs. You should also observe the same precautions with respect to power and static electricity. Each option is shipped with full instructions for installation; consult those instructions for more information.