SE/30 CMD-CTRL-POWER Reset

[Crutch]

Oh right ... yes, I guess it’s slightly easier if we only ever care about being able to turn it on.   The shutdown problem is way harder, no idea how to extract the right signal out of software on an SE/30.

 

[Bolle]

You could see what happens with the /PFW line if you select "shutdown" from the menu. If it is pulled low by VIA2 then you can tap in there and have the power supply turn off.

 

[Von]

Here is the link to the board that needed to be added to the SeaSonic PS to get softpower: 

 

[JDW]

@Von In other words, you are using an NPN transistor (and resistors) to make a simple investor, such that when the transistor is OFF the output is HI (i.e., Seasonic PSU disabled), and when the transistor is switched ON the output is GND (i.e., Seasonic PSU enabled).

 

[Mk.558]

I'm curious if that Power button key thing can be used to perform reset and interrupt functions in substitution of the hardware reset and interrupt buttons? Those plastic hardware reset switch thingys are not that common, but also delicate.

 

[Dog Cow]

I'm curious if that Power button key thing can be used to perform reset and interrupt functions in substitution of the hardware reset and interrupt buttons?

Sure. If the Power key can be detected by software, you can have a little routine call the _Debugger trap. The Motorola 680x0 has a RESET instruction which could be executed for Reset. It wouldn't be exactly the same as the physical switches though, because it's dependent on your little routine being able to run.

 

[Crutch]

Sure. If the Power key can be detected by software, you can have a little routine call the _Debugger trap. The Motorola 680x0 has a RESET instruction which could be executed for Reset. It wouldn't be exactly the same as the physical switches though, because it's dependent on your little routine being able to run.

This is exactly what the Programmer’s Key INIT does. It is indeed less reliable than a physical switch if the system is truly wonked.