How to solder a level 7 interrupt button into an A1200?

[Nickman]

Syntax Error hardware hacks

[anakirob]

Well done Nickman, that's exactly what spot wants!
And it's in swedish too. He will be pleased.

For those of us who don't speak swedish:



A1200
Solder a switch connecting pins 81, 82 & 83 of the expansion port (trapdoor) to Ground via 1N4148 diode.

This is very fiddly, unless you're an expert on the soldering iron you may like to get an electrician to do this for you.

A500
Solder a switch connecting pins 40, 42 & 44 of the expansion port (left hand side) to Ground via 1N4148 diode.

[Johan Samuelsson]

THANK YOU! JUST WHAT I NEEDED!!!
EDIT: L7 button installed and working =)
Amiga and Blizzard card is alive and doing better than ever!

[AeroMan]

I would recommend a resistor in series with the switch. I don't know if the Paula lines are open colector or not. You might fry the lady.
Does anybody has this information ?

[pyrre]

A noob question:

What is a level 7 interrupt?

EDIT:
and what purpose would it serve in an Amiga?

[anakirob]

@Pyrre
68k Interrupts - Wikipedia

It would serve to halt the system, even when the OS is not active. Useful for debugging code, cheating at games and ripping data.

This is how the Action Replay cartridge does its thing. I'm guessing Spot is planning to build such a device.

@Spot
When you complete your system monitor device, how about making details available so we can all have one. Unless you're planning on manufacturing and selling them. In which case "I want to buy one".

[Johan Samuelsson]

I am not building a device.
Toni Wilen just made a romable version of HRTMon (a software Action Replay clone). I am burning my own kickstart with lots of fancy stuff on it, one of those is HRTMon. What better place to have it than in the kickstart?
No clunky devices for me.

[pyrre]

I am burning my own kickstart with lots of fancy stuff on it, one of those is HRTMon.

Would that mean, when you solder the lvl7 interrupt. And "push" the button. It will trigger the computer to pause. Like the Action replay device does. And with the HRTMon software inside the kickstart ROM chip. You basically have an action replay device in the ROM chip....

Did I get that right?

[Johan Samuelsson]

pyrre: yes

[Piru]

However, in fairness HRTmon doesn't include all the features Action Replay has: For example HRTmon doesn't track all the custom register writes, and thus is unable to restore the system state in some cases.

[bm07]

I realize this was a long time ago - but does this work?  Would love to build such a thing, any points on how to do so would be great.