Jumper settings for Jamicon KM-S4-1 \ VOGONS

Jumper settings for Jamicon KM-S4-1

Topic actions

First post, by RagingSquirrel

Posted on 2024-02-26, 15:46

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

Hi i have a Jamicon KM-S4-1 motherboard.. and i found this manual for it https://theretroweb.com/motherboard/manual/km … ca443942306.pdf

i have an Enhanced amd 486 dx 100 processor.. this one : https://www.cpu-world.com/CPUs/80486/AMD-A804 … X4-100SV8B.html

My question is , in the manual the motherboard can be jumpered to 3.3, and also to 3.45

According to the cpus manual it can support both.. so how could i set the jumpers without damaging the processor? Is there a performance difference between the two values? Also what is that dack signal for ecp/epp ? Should leave it to default DACK 1 instead of setting to DACK 3 ?

Reply 1 of 10, by RagingSquirrel

Posted on 2024-02-26, 15:49

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

Also i know i have to set the JP16 to write-Back, but how about JP30 is that for overclocking? Should i leave it to default 3x?

Reply 2 of 10, by debs3759

Posted on 2024-02-26, 15:52

debs3759 Offline

Rank Oldbie

Rank: Oldbie
Posts: 1863
Joined: 2016-08-22, 00:07
Location: Northampton, United Kingdom

As the VCC is 3.0 - 3.6V, either setting should be safe. The higher setting would potentially allow a higher overclock, depending on your individual board and CPU

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 3 of 10, by debs3759

Posted on 2024-02-26, 15:53

debs3759 Offline

Rank Oldbie

Rank: Oldbie
Posts: 1863
Joined: 2016-08-22, 00:07
Location: Northampton, United Kingdom

To run it at its designated speed, you want the x3 setting. x2 would be an underclock.

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 4 of 10, by RagingSquirrel

Posted on 2024-02-26, 15:54

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

debs3759 wrote on 2024-02-26, 15:52:

As the VCC is 3.0 - 3.6V, either setting should be safe. The higher setting would potentially allow a higher overclock, depending on your individual board and CPU

I am not planning to do any overclocking.. so in that case i should be safer with 3v? Also how about the clock speed multiplyer? as i can see now it is setted to 2x, but according to the manual the default is 3x ..

Reply 5 of 10, by RagingSquirrel

Posted on 2024-02-26, 15:55

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

debs3759 wrote on 2024-02-26, 15:53:

To run it at its designated speed, you want the x3 setting. x2 would be an underclock.

ohh i see thank you .. i will remove that jumper than

Reply 6 of 10, by debs3759

Posted on 2024-02-26, 16:01

debs3759 Offline

Rank Oldbie

Rank: Oldbie
Posts: 1863
Joined: 2016-08-22, 00:07
Location: Northampton, United Kingdom

RagingSquirrel wrote on 2024-02-26, 15:54:

debs3759 wrote on 2024-02-26, 15:52:

As the VCC is 3.0 - 3.6V, either setting should be safe. The higher setting would potentially allow a higher overclock, depending on your individual board and CPU

I am not planning to do any overclocking.. so in that case i should be safer with 3v? Also how about the clock speed multiplyer? as i can see now it is setted to 2x, but according to the manual the default is 3x ..

3.3V is the right setting in most cases. Only use 3.45V if 3.3V is unstable, but 3.3V should be good. Your chip will last longer at the lowest stable voltage.

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 7 of 10, by RagingSquirrel

Posted on 2024-02-26, 16:02

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

debs3759 wrote on 2024-02-26, 16:01:

RagingSquirrel wrote on 2024-02-26, 15:54:

debs3759 wrote on 2024-02-26, 15:52:

As the VCC is 3.0 - 3.6V, either setting should be safe. The higher setting would potentially allow a higher overclock, depending on your individual board and CPU

I am not planning to do any overclocking.. so in that case i should be safer with 3v? Also how about the clock speed multiplyer? as i can see now it is setted to 2x, but according to the manual the default is 3x ..

3.3V is the right setting in most cases. Only use 3.45V if 3.3V is unstable, but 3.3V should be good. Your chip will last longer at the lowest stable voltage.

ok thank you for your help...

Reply 8 of 10, by RagingSquirrel

Posted on 2024-02-26, 16:06

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

Just one more question about that DACK signal For ECP/EPP .. how should i set the jumper on that one?

Reply 9 of 10, by debs3759

Posted on 2024-02-26, 16:10

debs3759 Offline

Rank Oldbie

Rank: Oldbie
Posts: 1863
Joined: 2016-08-22, 00:07
Location: Northampton, United Kingdom

It's been so long since I used a parallel port that I would just use the default setting, as I don't know.

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 10 of 10, by RagingSquirrel

Posted on 2024-02-26, 16:12

RagingSquirrel Offline

Rank Member

Rank: Member
Posts: 114
Joined: 2024-02-14, 09:14

debs3759 wrote on 2024-02-26, 16:10:

It's been so long since I used a parallel port that I would just use the default setting, as I don't know.

That was my taught as well xD Thank You ..

Go to top of page Go to top of page

Back to General Old Hardware