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Reset Switch GND, RESET#, brown, white

S

Skybuck Flying

Jan 1, 1970
0
Hello,

ASRock's motherboard 939A790GMH mentions the following in the quick
installation guide/manual:

Page 23:

System Panel Header:
O O O O
O O O O O - dummy
| |
GND RESET#

Antec 1200's reset switch connector has a brown and a white cable.

I have some question about this:

1. What is "RESET#" ? (I can understand "ground" but "RESET#" ???)

2. How does a reset switch work ? Does it "cut power" ? Does it make all the
electricity flow away via ground or something ?

3. How to connect the reset switch ? Should the brown wire go to GND or vice
versa ?

I also have a theory how the motherboard might get damage if it's not
grounded:

The gnd cables and/or the reset switch somehow makes it possible for the
chasis voltage and low ampere to briefly flow back into the motherboard,
this probably weakens the electronics, if this is done often enough
motherboard death would occur, therefore it would be best to ground the PC
so this can't happen ?!?

4. Last question, is this theory possible ? ;)

Bye,
Skybuck.
 
S

Skybuck Flying

Jan 1, 1970
0
Metspitzer said:
I have only bought a handful of compter cases and motherboards.
Everyone I have ever built has the label side of the connectors facing
to the edge of the mobo.

Any exceptions?

There are 4 edges ;)

Ok two edges can be dismissed.

This leaves two edges ;)

So the labels are always facing an edge of a motherboard.

I swapped the connector just at the last moment to follow your advice of
facing the edge.

Brown now goes to ground and white to reset.

The power button and the other side is facing the other edge and I am 100%
sure that's how it's supposed to be at least assuming "black is ground" ;)


Black is ground ?

Hmm yup at least for the fans so I will assume this is for headers too.

Bye,
Skybuck.

Better check this ;)
 
S

Shaun

Jan 1, 1970
0
"Skybuck Flying" wrote in message

Hello,

ASRock's motherboard 939A790GMH mentions the following in the quick
installation guide/manual:

Page 23:

System Panel Header:
O O O O
O O O O O - dummy
| |
GND RESET#

Antec 1200's reset switch connector has a brown and a white cable.

I have some question about this:

1. What is "RESET#" ? (I can understand "ground" but "RESET#" ???)

2. How does a reset switch work ? Does it "cut power" ? Does it make all the
electricity flow away via ground or something ?

3. How to connect the reset switch ? Should the brown wire go to GND or vice
versa ?

I also have a theory how the motherboard might get damage if it's not
grounded:

The gnd cables and/or the reset switch somehow makes it possible for the
chasis voltage and low ampere to briefly flow back into the motherboard,
this probably weakens the electronics, if this is done often enough
motherboard death would occur, therefore it would be best to ground the PC
so this can't happen ?!?

4. Last question, is this theory possible ? ;)

Bye,
Skybuck.


Stick the RESET line up your ass, it will probably work better there on your
computer.
 
J

Jasen Betts

Jan 1, 1970
0
Brown now goes to ground and white to reset.

The power button and the other side is facing the other edge and I am 100%
sure that's how it's supposed to be at least assuming "black is ground" ;)


Black is ground ?

Hmm yup at least for the fans so I will assume this is for headers too.

With motherboard/front-panel connectors usually white is ground and
colour is active, but polarity only matters for the LEDs. The switches
and the loudspeaker will function fine with either polarity.
 
S

Skybuck Flying

Jan 1, 1970
0
You guys make little sense.

Anyway, something else doesn't make sense.

Why is there a "gnd" connection for the reset header ?!?!?

Could it be important ?! ;)

Bye,
Skybuck.
 
N

Nobody

Jan 1, 1970
0
2. How does a reset switch work ? Does it "cut power" ?
No.

Does it make all the electricity flow away via ground
No.

or something ?

It connects the reset line to ground. The reset line is just a normal
logic input to the CPU (and to many of the other ICs on the motherboard).

For a typical 8-bit microcomputer, the reset circuitry looked something
like:

-----+----------+------- V+
| |
+--o---+ +-+
| Vcc | R | |
| | | |
| CPU | +-+
| | |
| RST o------+-----+
| | | |
| | | o |
| | C --- |) SW
| Gnd | --- o |
+--o---+ | |
| | |
-----+----------+-----+- Gnd

At power-on, the (initially uncharged) capacitor will pull the reset line
low. At any time, pressing the reset button will pull it low.

Without a power-on reset circuit, the CPU would just start executing from
an undefined state (i.e. undefined values in all registers, including the
program counter). Simply cutting power to the CPU doesn't necessarily
reset it unless the CPU has a built-in power-on reset circuit
(microcontrollers such as the PIC do; CPUs such as the 6502 or Z80
typically didn't).
3. How to connect the reset switch ? Should the brown wire go to GND or vice
versa ?

It doesn't matter; switches aren't polarised.
 
S

Skybuck Flying

Jan 1, 1970
0
Nobody said:
It connects the reset line to ground.

Why ? To make the signal low as you stated ?

What if "ground" is actually not ground and is actually under a voltage like
120 volts ?!?

Perhaps that is possible when PC is not grounded ?!

Bye,
Skybuck.
 
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