Uh oh - A2000 thinks fire button is being held down

[JimS]

Thanks for the advice, everyone.

What exactly are these EMI things? (i.e., what's the part called that I should use as a replacement?)

EMI: ElectroMagnetic Interference. Basically there to keep your machine from spewing out radio frequency interference thru it's connectors. It's a passthru connection with a capacitor to ground to shunt off RF noise.  Some have ferrite beads on them but these are 6800pF capacitors to ground, according to the schematics. If I found one bad, I'd just remove it, and jumper across. ;-) But that's just me, the FCC scofflaw. ;-)

[shaf]

Matt did you mention the Revision your B2000 Motherboard is, I remember there being compatibility problems with Earlier B2000 revisions.

[mechy]

Just when I think I've got my rebuilt A2000 stable! Arg.

There's nothing connected to the joystick port, but lowlevel.library seems to think that the red button is being held down, as does stuff run through WHDLoad. Anyone have any ideas? I'm a little scared to plug in a CD32 pad (to see if the presence of an actual joystick without any buttons pressed would make a difference), just in case something gets zapped.

This machine used to be configured as a Toaster system. Could there have been a hardware modification for setting up a GPI trigger?

Thanks in advance!

Edit: Hardware details - 2630+2632, AD516, OneStopMusicShop, 2091, Indivision ECS, MegAChip

pull and reseat paula chip. if thats not it try changing with a known good one. if that doesnt work check for a bad socket with internal break.

-mech-

[Matt_H]

Matt did you mention the Revision your B2000 Motherboard is, I remember there being compatibility problems with Earlier B2000 revisions.

It's a 6.2, which I think is pretty safe.

[Matt_H]

pull and reseat paula chip. if thats not it try changing with a known good one. if that doesnt work check for a bad socket with internal break.

-mech-

Would Paula explain the weird accelerator symptoms?

[gertsy]

You have checked the joy port pins ?  If corroded the pins can sometimes catch and get pushed backward when inserting a joystick plug.  looking at the arms on the back of the socket, where they enter the mother board, will tell you.

[Matt_H]

You have checked the joy port pins ?  If corroded the pins can sometimes catch and get pushed backward when inserting a joystick plug.  looking at the arms on the back of the socket, where they enter the mother board, will tell you.

The pins all look good.

[Matt_H]

Would Paula explain the weird accelerator symptoms?

Reseated Paula, no effect.

[Matt_H]

Ok, you'll all hate me for this being so simple, but not as much as I hate myself. Plugged in a CD32 controller. Now all is well.

This is - by far - the strangest Amiga problem and solution I have ever encountered. I hope I never deal with something like this again.

So, for the record, A2630 + lowlevel.library + no joypad = problem. Madness. Absolute madness.

[matthey]

I've noticed strange behavior from the lowlevel.library on a 3000 also. I installed this new lowlevel.library and it fixed all my problems:

http://aminet.net/driver/input/NewLowLevel.lha