Amiga 3000 zip ram problem

[VingtTrois]

With or without moving the RAM size jumpers (J852/853)?

If DIP 256kx4 work and ZIP don't it's clearly a problem with the sockets.

Or a problem with one of each 1M (2 chips = 1MB) of ZIP chips!
Do you have a warranty for your ZIP Ram memory?

For the FPU, read this: http://www.amiga-hardware.com/downloads/a3000fpuupgrade.jpg
Check with SYSINFO or AIBB if your FPU is at 42MHz ?!?

[VingtTrois]

@agr: or simply electrostatic discharge (ESD) have destroyed all these chips! :-(

[VingtTrois]

@VingtTrois I'm equiped with ESD condoms (antistatic wrist strap and desk mat).

I'm interested by the absolute memory testing solution, this is what the system may do to detect the ram chips...

I can test for you each chips (for free), on A3000/030@25MHz Rev9.3 + 2x OKTAGON 2008.