A4000/A3640 can't see the secondary devices

[Berry]

When i connect a ZIP and/or DVD drive to my A4000, using a A3640 card, the system doesn't boot. While disconnecting the ZIP/DVD drives my A4000 boots again.

Interestingly enough the ZIP and DVD drive are working in the same A4000 when i exchange the A3640 for the 030/25MHz card.

I have made a detailed overview on my blog.

Can someone help me on this brain cracker?

[Berry]

I figured out that the PIO2 modification doesn't work for me in the above mentioned config. I have used two different sourced PIO2 mod GALs, both same results. While using the stock GALs all problems have vanished!

So back to basic again, and now it works!