A500 booting straight into Guru Meditation

[larsovef]

I’m trying to figure out and decipher guru meditations that show up on boot.
I am able to click away and boot from my Gotek after that. But it does seem strange. The A500 is a rev8 with 512kb ram. Very clean MB and in otherwise good condition.

The messages I’ve written down are:
#000000003 52e36b2f
And
#000000003 00c01570

So some address error? What does the other numbers mean?

Thanks!

[thebajaguy]

I would give every socketed DIP chip a slight lift and re-seat. Oxidation could be a factor.

One cap on the A500 motherboard that does matter is the cap in the reset circuit. If the through-hole cap dries out, the system comes out of reset too soon, before all other circuits are ready. On the Rev 6a/7 it's C42. Likely to be the same on Rev 8.

I would also put a digital voltmeter on the 5V/Ground lines on both sides of the A500. Make sure you are getting a full 5V at all points.

[larsovef]

Originally Posted by thebajaguy

I would give every socketed DIP chip a slight lift and re-seat. Oxidation could be a factor.

One cap on the A500 motherboard that does matter is the cap in the reset circuit. If the through-hole cap dries out, the system comes out of reset too soon, before all other circuits are ready. On the Rev 6a/7 it's C42. Likely to be the same on Rev 8.

I would also put a digital voltmeter on the 5V/Ground lines on both sides of the A500. Make sure you are getting a full 5V at all points.

Thank you for your reply!
I’ll recap the board and clean and inspect the ICs and sockets after the Easter holiday.

[larsovef]

Originally Posted by thebajaguy

I would give every socketed DIP chip a slight lift and re-seat. Oxidation could be a factor.

One cap on the A500 motherboard that does matter is the cap in the reset circuit. If the through-hole cap dries out, the system comes out of reset too soon, before all other circuits are ready. On the Rev 6a/7 it's C42. Likely to be the same on Rev 8.

I would also put a digital voltmeter on the 5V/Ground lines on both sides of the A500. Make sure you are getting a full 5V at all points.

It seems like it was the RAM expansion that was the issue. I removed it and it seems like the GURU-meditation is gone. The RAM expansion is the 2mb for A500 edition bought at Amigastore.eu and came with a GARY-adapter. Unfortunately I madaged to break off one of the pins on the adapter when i needed to refit the adapter. I've left the card in the expansion slot and AmigaTK recognizes 512kb ram . Not sure if I need to adjust some jumper settings on the expansion card when not using the GARY-adapter.(?) The initial goal was to have 1mb of chip and 1 mb slow ram.